diff --git a/AGENTS.md b/AGENTS.md
index 2338365cc..2ee441483 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -96,7 +96,7 @@ oh-my-opencode/
 - **Over-exploration**: Stop searching when sufficient context found
 - **High temperature**: Don't use >0.3 for code-related agents
 - **Broad tool access**: Prefer explicit `include` over unrestricted access
-- **Sequential agent calls**: Use `sisyphus_task` for parallel execution
+- **Sequential agent calls**: Use `delegate_task` for parallel execution
 - **Heavy PreToolUse logic**: Slows every tool call
 - **Self-planning for complex tasks**: Spawn planning agent (Prometheus) instead
 - **Trust agent self-reports**: ALWAYS verify results independently
diff --git a/README.md b/README.md
index c57b737d7..595a1ff30 100644
--- a/README.md
+++ b/README.md
@@ -583,7 +583,7 @@ Hand your best tools to your best colleagues. Now they can properly refactor, na
 - **ast_grep_search**: AST-aware code pattern search (25 languages)
 - **ast_grep_replace**: AST-aware code replacement
 - **call_omo_agent**: Spawn specialized explore/librarian agents. Supports `run_in_background` parameter for async execution.
-- **sisyphus_task**: Category-based task delegation with specialized agents. Supports pre-configured categories (visual, business-logic) or direct agent targeting. Use `background_output` to retrieve results and `background_cancel` to cancel tasks. See [Categories](#categories).
+- **delegate_task**: Category-based task delegation with specialized agents. Supports pre-configured categories (visual, business-logic) or direct agent targeting. Use `background_output` to retrieve results and `background_cancel` to cancel tasks. See [Categories](#categories).
 
 #### Session Management
 
@@ -922,7 +922,7 @@ Available agents: `oracle`, `librarian`, `explore`, `frontend-ui-ux-engineer`, `
 Oh My OpenCode includes built-in skills that provide additional capabilities:
 
 - **playwright**: Browser automation with Playwright MCP. Use for web scraping, testing, screenshots, and browser interactions.
-- **git-master**: Git expert for atomic commits, rebase/squash, and history search (blame, bisect, log -S). STRONGLY RECOMMENDED: Use with `sisyphus_task(category='quick', skills=['git-master'], ...)` to save context.
+- **git-master**: Git expert for atomic commits, rebase/squash, and history search (blame, bisect, log -S). STRONGLY RECOMMENDED: Use with `delegate_task(category='quick', skills=['git-master'], ...)` to save context.
 
 Disable built-in skills via `disabled_skills` in `~/.config/opencode/oh-my-opencode.json` or `.opencode/oh-my-opencode.json`:
 
@@ -1061,7 +1061,7 @@ Configure concurrency limits for background agent tasks. This controls how many
 
 ### Categories
 
-Categories enable domain-specific task delegation via the `sisyphus_task` tool. Each category applies runtime presets (model, temperature, prompt additions) when calling the `Sisyphus-Junior` agent.
+Categories enable domain-specific task delegation via the `delegate_task` tool. Each category applies runtime presets (model, temperature, prompt additions) when calling the `Sisyphus-Junior` agent.
 
 **Default Categories:**
 
@@ -1073,12 +1073,12 @@ Categories enable domain-specific task delegation via the `sisyphus_task` tool.
 **Usage:**
 
 ```
-// Via sisyphus_task tool
-sisyphus_task(category="visual", prompt="Create a responsive dashboard component")
-sisyphus_task(category="business-logic", prompt="Design the payment processing flow")
+// Via delegate_task tool
+delegate_task(category="visual", prompt="Create a responsive dashboard component")
+delegate_task(category="business-logic", prompt="Design the payment processing flow")
 
 // Or target a specific agent directly
-sisyphus_task(agent="oracle", prompt="Review this architecture")
+delegate_task(agent="oracle", prompt="Review this architecture")
 ```
 
 **Custom Categories:**
diff --git a/README.zh-cn.md b/README.zh-cn.md
index 6cb7b24f9..eaf3d4c0e 100644
--- a/README.zh-cn.md
+++ b/README.zh-cn.md
@@ -580,7 +580,7 @@ gh repo star code-yeongyu/oh-my-opencode
 - **ast_grep_search**：AST 感知的代码模式搜索（25 种语言）
 - **ast_grep_replace**：AST 感知的代码替换
 - **call_omo_agent**：生成专业的 explore/librarian 智能体。支持 `run_in_background` 参数进行异步执行。
-- **sisyphus_task**：基于类别的任务委派，使用专业智能体。支持预配置的类别（visual、business-logic）或直接指定智能体。使用 `background_output` 检索结果，使用 `background_cancel` 取消任务。参见[类别](#类别)。
+- **delegate_task**：基于类别的任务委派，使用专业智能体。支持预配置的类别（visual、business-logic）或直接指定智能体。使用 `background_output` 检索结果，使用 `background_cancel` 取消任务。参见[类别](#类别)。
 
 #### 会话管理
 
@@ -931,7 +931,7 @@ Oh My OpenCode 从以下位置读取和执行钩子：
 Oh My OpenCode 包含提供额外功能的内置技能：
 
 - **playwright**：使用 Playwright MCP 进行浏览器自动化。用于网页抓取、测试、截图和浏览器交互。
-- **git-master**：Git 专家，用于原子提交、rebase/squash 和历史搜索（blame、bisect、log -S）。**强烈推荐**：与 `sisyphus_task(category='quick', skills=['git-master'], ...)` 一起使用以节省上下文。
+- **git-master**：Git 专家，用于原子提交、rebase/squash 和历史搜索（blame、bisect、log -S）。**强烈推荐**：与 `delegate_task(category='quick', skills=['git-master'], ...)` 一起使用以节省上下文。
 
 通过 `~/.config/opencode/oh-my-opencode.json` 或 `.opencode/oh-my-opencode.json` 中的 `disabled_skills` 禁用内置技能：
 
@@ -1070,7 +1070,7 @@ Oh My OpenCode 包含提供额外功能的内置技能：
 
 ### 类别
 
-类别通过 `sisyphus_task` 工具实现领域特定的任务委派。每个类别预配置一个专业的 `Sisyphus-Junior-{category}` 智能体，带有优化的模型设置和提示。
+类别通过 `delegate_task` 工具实现领域特定的任务委派。每个类别预配置一个专业的 `Sisyphus-Junior-{category}` 智能体，带有优化的模型设置和提示。
 
 **默认类别：**
 
@@ -1082,12 +1082,12 @@ Oh My OpenCode 包含提供额外功能的内置技能：
 **使用方法：**
 
 ```
-// 通过 sisyphus_task 工具
-sisyphus_task(category="visual", prompt="创建一个响应式仪表板组件")
-sisyphus_task(category="business-logic", prompt="设计支付处理流程")
+// 通过 delegate_task 工具
+delegate_task(category="visual", prompt="创建一个响应式仪表板组件")
+delegate_task(category="business-logic", prompt="设计支付处理流程")
 
 // 或直接指定特定智能体
-sisyphus_task(agent="oracle", prompt="审查这个架构")
+delegate_task(agent="oracle", prompt="审查这个架构")
 ```
 
 **自定义类别：**
diff --git a/docs/category-skill-guide.md b/docs/category-skill-guide.md
index 1d5d8f8fe..008610147 100644
--- a/docs/category-skill-guide.md
+++ b/docs/category-skill-guide.md
@@ -9,7 +9,7 @@ Instead of delegating everything to a single AI agent, it's far more efficient t
 - **Category**: "What kind of work is this?" (determines model, temperature, prompt mindset)
 - **Skill**: "What tools and knowledge are needed?" (injects specialized knowledge, MCP tools, workflows)
 
-By combining these two concepts, you can generate optimal agents through `sisyphus_task`.
+By combining these two concepts, you can generate optimal agents through `delegate_task`.
 
 ---
 
@@ -30,10 +30,10 @@ A Category is an agent configuration preset optimized for specific domains.
 
 ### Usage
 
-Specify the `category` parameter when invoking the `sisyphus_task` tool.
+Specify the `category` parameter when invoking the `delegate_task` tool.
 
 ```typescript
-sisyphus_task(
+delegate_task(
   category="visual-engineering",
   prompt="Add a responsive chart component to the dashboard page"
 )
@@ -72,7 +72,7 @@ A Skill is a mechanism that injects **specialized knowledge (Context)** and **to
 Add desired skill names to the `skills` array.
 
 ```typescript
-sisyphus_task(
+delegate_task(
   category="quick",
   skills=["git-master"],
   prompt="Commit current changes. Follow commit message style."
@@ -124,7 +124,7 @@ You can create powerful specialized agents by combining Categories and Skills.
 
 ---
 
-## 5. sisyphus_task Prompt Guide
+## 5. delegate_task Prompt Guide
 
 When delegating, **clear and specific** prompts are essential. Include these 7 elements:
 
diff --git a/docs/orchestration-guide.md b/docs/orchestration-guide.md
index 0fb0f028b..8b6acc30e 100644
--- a/docs/orchestration-guide.md
+++ b/docs/orchestration-guide.md
@@ -149,4 +149,4 @@ You can control related features in `oh-my-opencode.json`.
 
 1. **Don't Rush**: Invest sufficient time in the interview with Prometheus. The more perfect the plan, the faster the execution.
 2. **Single Plan Principle**: No matter how large the task, contain all TODOs in one plan file (`.md`). This prevents context fragmentation.
-3. **Active Delegation**: During execution, delegate to specialized agents via `sisyphus_task` rather than modifying code directly.
+3. **Active Delegation**: During execution, delegate to specialized agents via `delegate_task` rather than modifying code directly.
diff --git a/src/agents/AGENTS.md b/src/agents/AGENTS.md
index 86862d6d9..cdadaa2b2 100644
--- a/src/agents/AGENTS.md
+++ b/src/agents/AGENTS.md
@@ -53,7 +53,7 @@ agents/
 ## ANTI-PATTERNS
 - **Trusting reports**: NEVER trust subagent self-reports; always verify outputs.
 - **High temp**: Don't use >0.3 for code agents (Sisyphus/Prometheus use 0.1).
-- **Sequential calls**: Prefer `sisyphus_task` with `run_in_background` for parallelism.
+- **Sequential calls**: Prefer `delegate_task` with `run_in_background` for parallelism.
 
 ## SHARED PROMPTS
 - **build-prompt.ts**: Unified base for Sisyphus and Builder variants.
diff --git a/src/agents/explore.ts b/src/agents/explore.ts
index bc887b314..624132529 100644
--- a/src/agents/explore.ts
+++ b/src/agents/explore.ts
@@ -29,7 +29,7 @@ export function createExploreAgent(model: string = DEFAULT_MODEL): AgentConfig {
     "write",
     "edit",
     "task",
-    "sisyphus_task",
+    "delegate_task",
     "call_omo_agent",
   ])
 
diff --git a/src/agents/librarian.ts b/src/agents/librarian.ts
index 0742ad454..4de5fe223 100644
--- a/src/agents/librarian.ts
+++ b/src/agents/librarian.ts
@@ -26,7 +26,7 @@ export function createLibrarianAgent(model: string = DEFAULT_MODEL): AgentConfig
     "write",
     "edit",
     "task",
-    "sisyphus_task",
+    "delegate_task",
     "call_omo_agent",
   ])
 
diff --git a/src/agents/metis.ts b/src/agents/metis.ts
index 5e6324754..0edc60135 100644
--- a/src/agents/metis.ts
+++ b/src/agents/metis.ts
@@ -275,7 +275,7 @@ const metisRestrictions = createAgentToolRestrictions([
   "write",
   "edit",
   "task",
-  "sisyphus_task",
+  "delegate_task",
 ])
 
 const DEFAULT_MODEL = "anthropic/claude-opus-4-5"
diff --git a/src/agents/momus.ts b/src/agents/momus.ts
index df41a125d..a19d3a50e 100644
--- a/src/agents/momus.ts
+++ b/src/agents/momus.ts
@@ -353,7 +353,7 @@ export function createMomusAgent(model: string = DEFAULT_MODEL): AgentConfig {
     "write",
     "edit",
     "task",
-    "sisyphus_task",
+    "delegate_task",
   ])
 
   const base = {
diff --git a/src/agents/oracle.ts b/src/agents/oracle.ts
index 6ed379536..131b43676 100644
--- a/src/agents/oracle.ts
+++ b/src/agents/oracle.ts
@@ -102,7 +102,7 @@ export function createOracleAgent(model: string = DEFAULT_MODEL): AgentConfig {
     "write",
     "edit",
     "task",
-    "sisyphus_task",
+    "delegate_task",
   ])
 
   const base = {
diff --git a/src/agents/orchestrator-sisyphus.ts b/src/agents/orchestrator-sisyphus.ts
index 4510bae1b..e65011d45 100644
--- a/src/agents/orchestrator-sisyphus.ts
+++ b/src/agents/orchestrator-sisyphus.ts
@@ -2,13 +2,13 @@ import type { AgentConfig } from "@opencode-ai/sdk"
 import type { AgentPromptMetadata } from "./types"
 import type { AvailableAgent, AvailableSkill } from "./sisyphus-prompt-builder"
 import type { CategoryConfig } from "../config/schema"
-import { DEFAULT_CATEGORIES, CATEGORY_DESCRIPTIONS } from "../tools/sisyphus-task/constants"
+import { DEFAULT_CATEGORIES, CATEGORY_DESCRIPTIONS } from "../tools/delegate-task/constants"
 import { createAgentToolRestrictions } from "../shared/permission-compat"
 
 /**
  * Orchestrator Sisyphus - Master Orchestrator Agent
  *
- * Orchestrates work via sisyphus_task() to complete ALL tasks in a todo list until fully done
+ * Orchestrates work via delegate_task() to complete ALL tasks in a todo list until fully done
  * You are the conductor of a symphony of specialized agents.
  */
 
@@ -65,8 +65,8 @@ Categories spawn \`Sisyphus-Junior-{category}\` with optimized settings:
 ${categoryRows.join("\n")}
 
 \`\`\`typescript
-sisyphus_task(category="visual-engineering", prompt="...")      // UI/frontend work
-sisyphus_task(category="ultrabrain", prompt="...")     // Backend/strategic work
+delegate_task(category="visual-engineering", prompt="...")      // UI/frontend work
+delegate_task(category="ultrabrain", prompt="...")     // Backend/strategic work
 \`\`\``
 }
 
@@ -95,9 +95,9 @@ ${skillRows.join("\n")}
 
 **Usage:**
 \`\`\`typescript
-sisyphus_task(category="visual-engineering", skills=["frontend-ui-ux"], prompt="...")
-sisyphus_task(category="general", skills=["playwright"], prompt="...")  // Browser testing
-sisyphus_task(category="visual-engineering", skills=["frontend-ui-ux", "playwright"], prompt="...")  // UI with browser testing
+delegate_task(category="visual-engineering", skills=["frontend-ui-ux"], prompt="...")
+delegate_task(category="general", skills=["playwright"], prompt="...")  // Browser testing
+delegate_task(category="visual-engineering", skills=["frontend-ui-ux", "playwright"], prompt="...")  // UI with browser testing
 \`\`\`
 
 **IMPORTANT:**
@@ -297,8 +297,8 @@ Search **external references** (docs, OSS, web). Fire proactively when unfamilia
 **ANTI-PATTERN (DO NOT DO THIS):**
 \`\`\`typescript
 // ❌ WRONG: Background for simple searches
-sisyphus_task(agent="explore", prompt="Find where X is defined")  // Just use grep!
-sisyphus_task(agent="librarian", prompt="How to use Y")  // Just use context7!
+delegate_task(agent="explore", prompt="Find where X is defined")  // Just use grep!
+delegate_task(agent="librarian", prompt="How to use Y")  // Just use context7!
 
 // ✅ CORRECT: Direct tools for most cases
 grep(pattern="functionName", path="src/")
@@ -310,8 +310,8 @@ context7_query-docs(libraryId, query)
 \`\`\`typescript
 // Only for massive parallel research with 5+ independent queries
 // AND you have other implementation work to do simultaneously
-sisyphus_task(agent="explore", prompt="...")  // Query 1
-sisyphus_task(agent="explore", prompt="...")  // Query 2
+delegate_task(agent="explore", prompt="...")  // Query 1
+delegate_task(agent="explore", prompt="...")  // Query 2
 // ... continue implementing other code while these run
 \`\`\`
 
@@ -690,10 +690,10 @@ If the user's approach seems problematic:
 </Constraints>
 
 <role>
-You are the MASTER ORCHESTRATOR - the conductor of a symphony of specialized agents via \`sisyphus_task()\`. Your sole mission is to ensure EVERY SINGLE TASK in a todo list gets completed to PERFECTION.
+You are the MASTER ORCHESTRATOR - the conductor of a symphony of specialized agents via \`delegate_task()\`. Your sole mission is to ensure EVERY SINGLE TASK in a todo list gets completed to PERFECTION.
 
 ## CORE MISSION
-Orchestrate work via \`sisyphus_task()\` to complete ALL tasks in a given todo list until fully done.
+Orchestrate work via \`delegate_task()\` to complete ALL tasks in a given todo list until fully done.
 
 ## IDENTITY & PHILOSOPHY
 
@@ -709,16 +709,16 @@ You do NOT execute tasks yourself. You DELEGATE, COORDINATE, and VERIFY. Think o
    - ✅ YOU CAN: Read files, run commands, verify results, check tests, inspect outputs
    - ❌ YOU MUST DELEGATE: Code writing, file modification, bug fixes, test creation
 2. **VERIFY OBSESSIVELY**: Subagents LIE. Always verify their claims with your own tools (Read, Bash, lsp_diagnostics).
-3. **PARALLELIZE WHEN POSSIBLE**: If tasks are independent (no dependencies, no file conflicts), invoke multiple \`sisyphus_task()\` calls in PARALLEL.
-4. **ONE TASK PER CALL**: Each \`sisyphus_task()\` call handles EXACTLY ONE task. Never batch multiple tasks.
-5. **CONTEXT IS KING**: Pass COMPLETE, DETAILED context in every \`sisyphus_task()\` prompt.
+3. **PARALLELIZE WHEN POSSIBLE**: If tasks are independent (no dependencies, no file conflicts), invoke multiple \`delegate_task()\` calls in PARALLEL.
+4. **ONE TASK PER CALL**: Each \`delegate_task()\` call handles EXACTLY ONE task. Never batch multiple tasks.
+5. **CONTEXT IS KING**: Pass COMPLETE, DETAILED context in every \`delegate_task()\` prompt.
 6. **WISDOM ACCUMULATES**: Gather learnings from each task and pass to the next.
 
 ### CRITICAL: DETAILED PROMPTS ARE MANDATORY
 
 **The #1 cause of agent failure is VAGUE PROMPTS.**
 
-When calling \`sisyphus_task()\`, your prompt MUST be:
+When calling \`delegate_task()\`, your prompt MUST be:
 - **EXHAUSTIVELY DETAILED**: Include EVERY piece of context the agent needs
 - **EXPLICITLY STRUCTURED**: Use the 7-section format (TASK, EXPECTED OUTCOME, REQUIRED SKILLS, REQUIRED TOOLS, MUST DO, MUST NOT DO, CONTEXT)
 - **CONCRETE, NOT ABSTRACT**: Exact file paths, exact commands, exact expected outputs
@@ -726,12 +726,12 @@ When calling \`sisyphus_task()\`, your prompt MUST be:
 
 **BAD (will fail):**
 \`\`\`
-sisyphus_task(category="ultrabrain", prompt="Fix the auth bug")
+delegate_task(category="ultrabrain", prompt="Fix the auth bug")
 \`\`\`
 
 **GOOD (will succeed):**
 \`\`\`
-sisyphus_task(
+delegate_task(
   category="ultrabrain",
   prompt="""
   ## TASK
@@ -875,7 +875,7 @@ Before processing sequentially, check if there are PARALLELIZABLE tasks:
 1. **Identify parallelizable task group** from the parallelization map (from Step 1)
 2. **If parallelizable group found** (e.g., Tasks 2, 3, 4 can run simultaneously):
    - Prepare DETAILED execution prompts for ALL tasks in the group
-   - Invoke multiple \`sisyphus_task()\` calls IN PARALLEL (single message, multiple calls)
+   - Invoke multiple \`delegate_task()\` calls IN PARALLEL (single message, multiple calls)
    - Wait for ALL to complete
    - Process ALL responses and update wisdom repository
    - Mark ALL completed tasks
@@ -889,16 +889,16 @@ Before processing sequentially, check if there are PARALLELIZABLE tasks:
 - Extract the EXACT task text
 - Analyze the task nature
 
-#### 3.2: Choose Category or Agent for sisyphus_task()
+#### 3.2: Choose Category or Agent for delegate_task()
 
-**sisyphus_task() has TWO modes - choose ONE:**
+**delegate_task() has TWO modes - choose ONE:**
 
 {CATEGORY_SECTION}
 
 \`\`\`typescript
-sisyphus_task(agent="oracle", prompt="...")     // Expert consultation
-sisyphus_task(agent="explore", prompt="...")    // Codebase search
-sisyphus_task(agent="librarian", prompt="...")  // External research
+delegate_task(agent="oracle", prompt="...")     // Expert consultation
+delegate_task(agent="explore", prompt="...")    // Codebase search
+delegate_task(agent="librarian", prompt="...")  // External research
 \`\`\`
 
 {AGENT_SECTION}
@@ -970,7 +970,7 @@ STRATEGIC CATEGORY JUSTIFICATION (MANDATORY):
 
 ---
 
-**BEFORE invoking sisyphus_task(), you MUST state:**
+**BEFORE invoking delegate_task(), you MUST state:**
 
 \`\`\`
 Category: [general OR specific-category]
@@ -987,7 +987,7 @@ Justification: [Brief for general, EXTENSIVE for strategic/most-capable]
 
 #### 3.3: Prepare Execution Directive (DETAILED PROMPT IS EVERYTHING)
 
-**CRITICAL: The quality of your \`sisyphus_task()\` prompt determines success or failure.**
+**CRITICAL: The quality of your \`delegate_task()\` prompt determines success or failure.**
 
 **RULE: If your prompt is short, YOU WILL FAIL. Make it EXHAUSTIVELY DETAILED.**
 
@@ -1063,7 +1063,7 @@ NOTEPAD PATH: .sisyphus/notepads/{plan-name}/ (READ for wisdom, WRITE findings)
 PLAN PATH: .sisyphus/plans/{plan-name}.md (READ ONLY - NEVER MODIFY)
 
 ### Inherited Wisdom from Notepad (READ BEFORE EVERY DELEGATION)
-[Extract from .sisyphus/notepads/{plan-name}/*.md before calling sisyphus_task]
+[Extract from .sisyphus/notepads/{plan-name}/*.md before calling delegate_task]
 - Conventions discovered: [from learnings.md]
 - Successful approaches: [from learnings.md]
 - Failed approaches to avoid: [from issues.md]
@@ -1082,12 +1082,12 @@ PLAN PATH: .sisyphus/plans/{plan-name}.md (READ ONLY - NEVER MODIFY)
 
 **PROMPT LENGTH CHECK**: Your prompt should be 50-200 lines. If it's under 20 lines, it's TOO SHORT.
 
-#### 3.4: Invoke via sisyphus_task()
+#### 3.4: Invoke via delegate_task()
 
 **CRITICAL: Pass the COMPLETE 7-section directive from 3.3. SHORT PROMPTS = FAILURE.**
 
 \`\`\`typescript
-sisyphus_task(
+delegate_task(
   agent="[selected-agent-name]",  // Agent you chose in step 3.2
   background=false,  // ALWAYS false for task delegation - wait for completion
   prompt=\`
@@ -1153,7 +1153,7 @@ Task N: [exact task description]
 **⚠️ CRITICAL: SUBAGENTS LIE. NEVER trust their claims. ALWAYS verify yourself.**
 **⚠️ YOU ARE THE QA GATE. If you don't verify, NO ONE WILL.**
 
-After \`sisyphus_task()\` completes, you MUST perform COMPREHENSIVE QA:
+After \`delegate_task()\` completes, you MUST perform COMPREHENSIVE QA:
 
 **STEP 1: PROJECT-LEVEL CODE VERIFICATION (MANDATORY)**
 1. **Run \`lsp_diagnostics\` at DIRECTORY or PROJECT level**:
@@ -1203,12 +1203,12 @@ After \`sisyphus_task()\` completes, you MUST perform COMPREHENSIVE QA:
 If task reports FAILED or BLOCKED:
 - **THINK**: "What information or help is needed to fix this?"
 - **IDENTIFY**: Which agent is best suited to provide that help?
-- **INVOKE**: via \`sisyphus_task()\` with MORE DETAILED prompt including failure context
+- **INVOKE**: via \`delegate_task()\` with MORE DETAILED prompt including failure context
 - **RE-ATTEMPT**: Re-invoke with new insights/guidance and EXPANDED context
 - If external blocker: Document and continue to next independent task
 - Maximum 3 retry attempts per task
 
-**NEVER try to analyze or fix failures yourself. Always delegate via \`sisyphus_task()\`.**
+**NEVER try to analyze or fix failures yourself. Always delegate via \`delegate_task()\`.**
 
 **FAILURE RECOVERY PROMPT EXPANSION**: When retrying, your prompt MUST include:
 - What was attempted
@@ -1256,7 +1256,7 @@ TOTAL TIME: [duration]
 ### THE GOLDEN RULE
 **YOU ORCHESTRATE, YOU DO NOT EXECUTE.**
 
-Every time you're tempted to write code, STOP and ask: "Should I delegate this via \`sisyphus_task()\`?"
+Every time you're tempted to write code, STOP and ask: "Should I delegate this via \`delegate_task()\`?"
 The answer is almost always YES.
 
 ### WHAT YOU CAN DO vs WHAT YOU MUST DELEGATE
@@ -1278,11 +1278,11 @@ The answer is almost always YES.
 - [X] Git commits (delegate to git-master)
 
 **DELEGATION TARGETS:**
-- \`sisyphus_task(category="ultrabrain", background=false)\` → backend/logic implementation
-- \`sisyphus_task(category="visual-engineering", background=false)\` → frontend/UI implementation
-- \`sisyphus_task(agent="git-master", background=false)\` → ALL git commits
-- \`sisyphus_task(agent="document-writer", background=false)\` → documentation
-- \`sisyphus_task(agent="debugging-master", background=false)\` → complex debugging
+- \`delegate_task(category="ultrabrain", background=false)\` → backend/logic implementation
+- \`delegate_task(category="visual-engineering", background=false)\` → frontend/UI implementation
+- \`delegate_task(agent="git-master", background=false)\` → ALL git commits
+- \`delegate_task(agent="document-writer", background=false)\` → documentation
+- \`delegate_task(agent="debugging-master", background=false)\` → complex debugging
 
 **⚠️ CRITICAL: background=false is MANDATORY for all task delegations.**
 
@@ -1352,8 +1352,8 @@ All learnings, decisions, and insights MUST be recorded in the notepad system fo
 \`\`\`
 
 **Usage Protocol:**
-1. **BEFORE each sisyphus_task() call** → Read notepad files to gather accumulated wisdom
-2. **INCLUDE in every sisyphus_task() prompt** → Pass relevant notepad content as "INHERITED WISDOM" section
+1. **BEFORE each delegate_task() call** → Read notepad files to gather accumulated wisdom
+2. **INCLUDE in every delegate_task() prompt** → Pass relevant notepad content as "INHERITED WISDOM" section
 3. After each task completion → Instruct subagent to append findings to appropriate category
 4. When encountering issues → Document in issues.md or problems.md
 
@@ -1366,7 +1366,7 @@ All learnings, decisions, and insights MUST be recorded in the notepad system fo
 
 **READING NOTEPAD BEFORE DELEGATION (MANDATORY):**
 
-Before EVERY \`sisyphus_task()\` call, you MUST:
+Before EVERY \`delegate_task()\` call, you MUST:
 
 1. Check if notepad exists: \`glob(".sisyphus/notepads/{plan-name}/*.md")\`
 2. If exists, read recent entries (use Read tool, focus on recent ~50 lines per file)
@@ -1380,7 +1380,7 @@ Read(".sisyphus/notepads/my-plan/learnings.md")
 Read(".sisyphus/notepads/my-plan/issues.md")
 Read(".sisyphus/notepads/my-plan/decisions.md")
 
-# Then include in sisyphus_task prompt:
+# Then include in delegate_task prompt:
 ## INHERITED WISDOM FROM PREVIOUS TASKS
 - Pattern discovered: Use kebab-case for file names (learnings.md)
 - Avoid: Direct DOM manipulation - use React refs instead (issues.md)  
@@ -1395,11 +1395,11 @@ Read(".sisyphus/notepads/my-plan/decisions.md")
 
 1. **Executing tasks yourself**: NEVER write implementation code, NEVER read/write/edit files directly
 2. **Ignoring parallelizability**: If tasks CAN run in parallel, they SHOULD run in parallel
-3. **Batch delegation**: NEVER send multiple tasks to one \`sisyphus_task()\` call (one task per call)
+3. **Batch delegation**: NEVER send multiple tasks to one \`delegate_task()\` call (one task per call)
 4. **Losing context**: ALWAYS pass accumulated wisdom in EVERY prompt
 5. **Giving up early**: RETRY failed tasks (max 3 attempts)
 6. **Rushing**: Quality over speed - but parallelize when possible
-7. **Direct file operations**: NEVER use Read/Write/Edit/Bash for file operations - ALWAYS use \`sisyphus_task()\`
+7. **Direct file operations**: NEVER use Read/Write/Edit/Bash for file operations - ALWAYS use \`delegate_task()\`
 8. **SHORT PROMPTS**: If your prompt is under 30 lines, it's TOO SHORT. EXPAND IT.
 9. **Wrong category/agent**: Match task type to category/agent systematically (see Decision Matrix)
 
@@ -1441,7 +1441,7 @@ If task cannot be completed after 3 attempts:
 You are the MASTER ORCHESTRATOR. Your job is to:
 1. **CREATE TODO** to track overall progress
 2. **READ** the todo list (check for parallelizability)
-3. **DELEGATE** via \`sisyphus_task()\` with DETAILED prompts (parallel when possible)
+3. **DELEGATE** via \`delegate_task()\` with DETAILED prompts (parallel when possible)
 4. **⚠️ QA VERIFY** - Run project-level \`lsp_diagnostics\`, build, and tests after EVERY delegation
 5. **ACCUMULATE** wisdom from completions
 6. **REPORT** final status
@@ -1449,9 +1449,9 @@ You are the MASTER ORCHESTRATOR. Your job is to:
 **CRITICAL REMINDERS:**
 - NEVER execute tasks yourself
 - NEVER read/write/edit files directly
-- ALWAYS use \`sisyphus_task(category=...)\` or \`sisyphus_task(agent=...)\`
+- ALWAYS use \`delegate_task(category=...)\` or \`delegate_task(agent=...)\`
 - PARALLELIZE when tasks are independent
-- One task per \`sisyphus_task()\` call (never batch)
+- One task per \`delegate_task()\` call (never batch)
 - Pass COMPLETE context in EVERY prompt (50+ lines minimum)
 - Accumulate and forward all learnings
 - **⚠️ RUN lsp_diagnostics AT PROJECT/DIRECTORY LEVEL after EVERY delegation**
@@ -1489,7 +1489,7 @@ export function createOrchestratorSisyphusAgent(ctx?: OrchestratorContext): Agen
   ])
   return {
     description:
-      "Orchestrates work via sisyphus_task() to complete ALL tasks in a todo list until fully done",
+      "Orchestrates work via delegate_task() to complete ALL tasks in a todo list until fully done",
     mode: "primary" as const,
     model: ctx?.model ?? DEFAULT_MODEL,
     temperature: 0.1,
diff --git a/src/agents/prometheus-prompt.ts b/src/agents/prometheus-prompt.ts
index b15fd6159..1f0b76cb6 100644
--- a/src/agents/prometheus-prompt.ts
+++ b/src/agents/prometheus-prompt.ts
@@ -291,8 +291,8 @@ Or should I just note down this single fix?"
 
 **Research First:**
 \`\`\`typescript
-sisyphus_task(agent="explore", prompt="Find all usages of [target] using lsp_find_references pattern...", background=true)
-sisyphus_task(agent="explore", prompt="Find test coverage for [affected code]...", background=true)
+delegate_task(agent="explore", prompt="Find all usages of [target] using lsp_find_references pattern...", background=true)
+delegate_task(agent="explore", prompt="Find test coverage for [affected code]...", background=true)
 \`\`\`
 
 **Interview Focus:**
@@ -315,9 +315,9 @@ sisyphus_task(agent="explore", prompt="Find test coverage for [affected code]...
 **Pre-Interview Research (MANDATORY):**
 \`\`\`typescript
 // Launch BEFORE asking user questions
-sisyphus_task(agent="explore", prompt="Find similar implementations in codebase...", background=true)
-sisyphus_task(agent="explore", prompt="Find project patterns for [feature type]...", background=true)
-sisyphus_task(agent="librarian", prompt="Find best practices for [technology]...", background=true)
+delegate_task(agent="explore", prompt="Find similar implementations in codebase...", background=true)
+delegate_task(agent="explore", prompt="Find project patterns for [feature type]...", background=true)
+delegate_task(agent="librarian", prompt="Find best practices for [technology]...", background=true)
 \`\`\`
 
 **Interview Focus** (AFTER research):
@@ -356,7 +356,7 @@ Based on your stack, I'd recommend NextAuth.js - it integrates well with Next.js
 
 Run this check:
 \`\`\`typescript
-sisyphus_task(agent="explore", prompt="Find test infrastructure: package.json test scripts, test config files (jest.config, vitest.config, pytest.ini, etc.), existing test files (*.test.*, *.spec.*, test_*). Report: 1) Does test infra exist? 2) What framework? 3) Example test file patterns.", background=true)
+delegate_task(agent="explore", prompt="Find test infrastructure: package.json test scripts, test config files (jest.config, vitest.config, pytest.ini, etc.), existing test files (*.test.*, *.spec.*, test_*). Report: 1) Does test infra exist? 2) What framework? 3) Example test file patterns.", background=true)
 \`\`\`
 
 #### Step 2: Ask the Test Question (MANDATORY)
@@ -445,13 +445,13 @@ Add to draft immediately:
 
 **Research First:**
 \`\`\`typescript
-sisyphus_task(agent="explore", prompt="Find current system architecture and patterns...", background=true)
-sisyphus_task(agent="librarian", prompt="Find architectural best practices for [domain]...", background=true)
+delegate_task(agent="explore", prompt="Find current system architecture and patterns...", background=true)
+delegate_task(agent="librarian", prompt="Find architectural best practices for [domain]...", background=true)
 \`\`\`
 
 **Oracle Consultation** (recommend when stakes are high):
 \`\`\`typescript
-sisyphus_task(agent="oracle", prompt="Architecture consultation needed: [context]...", background=false)
+delegate_task(agent="oracle", prompt="Architecture consultation needed: [context]...", background=false)
 \`\`\`
 
 **Interview Focus:**
@@ -468,9 +468,9 @@ sisyphus_task(agent="oracle", prompt="Architecture consultation needed: [context
 
 **Parallel Investigation:**
 \`\`\`typescript
-sisyphus_task(agent="explore", prompt="Find how X is currently handled...", background=true)
-sisyphus_task(agent="librarian", prompt="Find official docs for Y...", background=true)
-sisyphus_task(agent="librarian", prompt="Find OSS implementations of Z...", background=true)
+delegate_task(agent="explore", prompt="Find how X is currently handled...", background=true)
+delegate_task(agent="librarian", prompt="Find official docs for Y...", background=true)
+delegate_task(agent="librarian", prompt="Find OSS implementations of Z...", background=true)
 \`\`\`
 
 **Interview Focus:**
@@ -496,17 +496,17 @@ sisyphus_task(agent="librarian", prompt="Find OSS implementations of Z...", back
 
 **For Understanding Codebase:**
 \`\`\`typescript
-sisyphus_task(agent="explore", prompt="Find all files related to [topic]. Show patterns, conventions, and structure.", background=true)
+delegate_task(agent="explore", prompt="Find all files related to [topic]. Show patterns, conventions, and structure.", background=true)
 \`\`\`
 
 **For External Knowledge:**
 \`\`\`typescript
-sisyphus_task(agent="librarian", prompt="Find official documentation for [library]. Focus on [specific feature] and best practices.", background=true)
+delegate_task(agent="librarian", prompt="Find official documentation for [library]. Focus on [specific feature] and best practices.", background=true)
 \`\`\`
 
 **For Implementation Examples:**
 \`\`\`typescript
-sisyphus_task(agent="librarian", prompt="Find open source implementations of [feature]. Look for production-quality examples.", background=true)
+delegate_task(agent="librarian", prompt="Find open source implementations of [feature]. Look for production-quality examples.", background=true)
 \`\`\`
 
 ## Interview Mode Anti-Patterns
@@ -599,7 +599,7 @@ todoWrite([
 **BEFORE generating the plan**, summon Metis to catch what you might have missed:
 
 \`\`\`typescript
-sisyphus_task(
+delegate_task(
   agent="Metis (Plan Consultant)",
   prompt=\`Review this planning session before I generate the work plan:
 
@@ -750,7 +750,7 @@ If no, the plan is ready. Run \`/start-work\` to begin."
 \`\`\`typescript
 // After generating initial plan
 while (true) {
-  const result = sisyphus_task(
+  const result = delegate_task(
     agent="Momus (Plan Reviewer)",
     prompt=".sisyphus/plans/{name}.md",
     background=false
diff --git a/src/agents/sisyphus-junior.test.ts b/src/agents/sisyphus-junior.test.ts
index c314c02d4..43d75610a 100644
--- a/src/agents/sisyphus-junior.test.ts
+++ b/src/agents/sisyphus-junior.test.ts
@@ -138,13 +138,13 @@ describe("createSisyphusJuniorAgentWithOverrides", () => {
     })
   })
 
-  describe("tool safety (task/sisyphus_task blocked, call_omo_agent allowed)", () => {
-    test("task and sisyphus_task remain blocked, call_omo_agent is allowed via tools format", () => {
+  describe("tool safety (task/delegate_task blocked, call_omo_agent allowed)", () => {
+    test("task and delegate_task remain blocked, call_omo_agent is allowed via tools format", () => {
       // #given
       const override = {
         tools: {
           task: true,
-          sisyphus_task: true,
+          delegate_task: true,
           call_omo_agent: true,
           read: true,
         },
@@ -158,25 +158,25 @@ describe("createSisyphusJuniorAgentWithOverrides", () => {
       const permission = result.permission as Record<string, string> | undefined
       if (tools) {
         expect(tools.task).toBe(false)
-        expect(tools.sisyphus_task).toBe(false)
+        expect(tools.delegate_task).toBe(false)
         // call_omo_agent is NOW ALLOWED for subagents to spawn explore/librarian
         expect(tools.call_omo_agent).toBe(true)
         expect(tools.read).toBe(true)
       }
       if (permission) {
         expect(permission.task).toBe("deny")
-        expect(permission.sisyphus_task).toBe("deny")
+        expect(permission.delegate_task).toBe("deny")
         // call_omo_agent is NOW ALLOWED for subagents to spawn explore/librarian
         expect(permission.call_omo_agent).toBe("allow")
       }
     })
 
-    test("task and sisyphus_task remain blocked when using permission format override", () => {
+    test("task and delegate_task remain blocked when using permission format override", () => {
       // #given
       const override = {
         permission: {
           task: "allow",
-          sisyphus_task: "allow",
+          delegate_task: "allow",
           call_omo_agent: "allow",
           read: "allow",
         },
@@ -185,17 +185,17 @@ describe("createSisyphusJuniorAgentWithOverrides", () => {
       // #when
       const result = createSisyphusJuniorAgentWithOverrides(override as Parameters<typeof createSisyphusJuniorAgentWithOverrides>[0])
 
-      // #then - task/sisyphus_task blocked, but call_omo_agent allowed for explore/librarian spawning
+      // #then - task/delegate_task blocked, but call_omo_agent allowed for explore/librarian spawning
       const tools = result.tools as Record<string, boolean> | undefined
       const permission = result.permission as Record<string, string> | undefined
       if (tools) {
         expect(tools.task).toBe(false)
-        expect(tools.sisyphus_task).toBe(false)
+        expect(tools.delegate_task).toBe(false)
         expect(tools.call_omo_agent).toBe(true)
       }
       if (permission) {
         expect(permission.task).toBe("deny")
-        expect(permission.sisyphus_task).toBe("deny")
+        expect(permission.delegate_task).toBe("deny")
         expect(permission.call_omo_agent).toBe("allow")
       }
     })
diff --git a/src/agents/sisyphus-junior.ts b/src/agents/sisyphus-junior.ts
index c7793f1e8..89cb78215 100644
--- a/src/agents/sisyphus-junior.ts
+++ b/src/agents/sisyphus-junior.ts
@@ -14,7 +14,7 @@ Execute tasks directly. NEVER delegate or spawn other agents.
 <Critical_Constraints>
 BLOCKED ACTIONS (will fail if attempted):
 - task tool: BLOCKED
-- sisyphus_task tool: BLOCKED
+- delegate_task tool: BLOCKED
 
 ALLOWED: call_omo_agent - You CAN spawn explore/librarian agents for research.
 You work ALONE for implementation. No delegation of implementation tasks.
@@ -75,7 +75,7 @@ function buildSisyphusJuniorPrompt(promptAppend?: string): string {
 
 // Core tools that Sisyphus-Junior must NEVER have access to
 // Note: call_omo_agent is ALLOWED so subagents can spawn explore/librarian
-const BLOCKED_TOOLS = ["task", "sisyphus_task"]
+const BLOCKED_TOOLS = ["task", "delegate_task"]
 
 export const SISYPHUS_JUNIOR_DEFAULTS = {
   model: "anthropic/claude-sonnet-4-5",
diff --git a/src/agents/sisyphus.ts b/src/agents/sisyphus.ts
index a59077397..62c39ec12 100644
--- a/src/agents/sisyphus.ts
+++ b/src/agents/sisyphus.ts
@@ -122,7 +122,7 @@ IMPORTANT: If codebase appears undisciplined, verify before assuming:
 
 const SISYPHUS_PRE_DELEGATION_PLANNING = `### Pre-Delegation Planning (MANDATORY)
 
-**BEFORE every \`sisyphus_task\` call, EXPLICITLY declare your reasoning.**
+**BEFORE every \`delegate_task\` call, EXPLICITLY declare your reasoning.**
 
 #### Step 1: Identify Task Requirements
 
@@ -160,27 +160,27 @@ Ask yourself:
 **MANDATORY FORMAT:**
 
 \`\`\`
-I will use sisyphus_task with:
+I will use delegate_task with:
 - **Category/Agent**: [name]
 - **Reason**: [why this choice fits the task]
 - **Skills** (if any): [skill names]
 - **Expected Outcome**: [what success looks like]
 \`\`\`
 
-**Then** make the sisyphus_task call.
+**Then** make the delegate_task call.
 
 #### Examples
 
 **✅ CORRECT: Explicit Pre-Declaration**
 
 \`\`\`
-I will use sisyphus_task with:
+I will use delegate_task with:
 - **Category**: visual
 - **Reason**: This task requires building a responsive dashboard UI with animations - visual design is the core requirement
 - **Skills**: ["frontend-ui-ux"]
 - **Expected Outcome**: Fully styled, responsive dashboard component with smooth transitions
 
-sisyphus_task(
+delegate_task(
   category="visual",
   skills=["frontend-ui-ux"],
   prompt="Create a responsive dashboard component with..."
@@ -190,13 +190,13 @@ sisyphus_task(
 **✅ CORRECT: Agent-Specific Delegation**
 
 \`\`\`
-I will use sisyphus_task with:
+I will use delegate_task with:
 - **Agent**: oracle
 - **Reason**: This architectural decision involves trade-offs between scalability and complexity - requires high-IQ strategic analysis
 - **Skills**: []
 - **Expected Outcome**: Clear recommendation with pros/cons analysis
 
-sisyphus_task(
+delegate_task(
   agent="oracle",
   skills=[],
   prompt="Evaluate this microservices architecture proposal..."
@@ -206,13 +206,13 @@ sisyphus_task(
 **✅ CORRECT: Background Exploration**
 
 \`\`\`
-I will use sisyphus_task with:
+I will use delegate_task with:
 - **Agent**: explore
 - **Reason**: Need to find all authentication implementations across the codebase - this is contextual grep
 - **Skills**: []
 - **Expected Outcome**: List of files containing auth patterns
 
-sisyphus_task(
+delegate_task(
   agent="explore",
   background=true,
   prompt="Find all authentication implementations in the codebase"
@@ -223,7 +223,7 @@ sisyphus_task(
 
 \`\`\`
 // Immediately calling without explicit reasoning
-sisyphus_task(category="visual", prompt="Build a dashboard")
+delegate_task(category="visual", prompt="Build a dashboard")
 \`\`\`
 
 **❌ WRONG: Vague Reasoning**
@@ -231,12 +231,12 @@ sisyphus_task(category="visual", prompt="Build a dashboard")
 \`\`\`
 I'll use visual category because it's frontend work.
 
-sisyphus_task(category="visual", ...)
+delegate_task(category="visual", ...)
 \`\`\`
 
 #### Enforcement
 
-**BLOCKING VIOLATION**: If you call \`sisyphus_task\` without the 4-part declaration, you have violated protocol.
+**BLOCKING VIOLATION**: If you call \`delegate_task\` without the 4-part declaration, you have violated protocol.
 
 **Recovery**: Stop, declare explicitly, then proceed.`
 
@@ -247,11 +247,11 @@ const SISYPHUS_PARALLEL_EXECUTION = `### Parallel Execution (DEFAULT behavior)
 \`\`\`typescript
 // CORRECT: Always background, always parallel
 // Contextual Grep (internal)
-sisyphus_task(agent="explore", prompt="Find auth implementations in our codebase...")
-sisyphus_task(agent="explore", prompt="Find error handling patterns here...")
+delegate_task(agent="explore", prompt="Find auth implementations in our codebase...")
+delegate_task(agent="explore", prompt="Find error handling patterns here...")
 // Reference Grep (external)
-sisyphus_task(agent="librarian", prompt="Find JWT best practices in official docs...")
-sisyphus_task(agent="librarian", prompt="Find how production apps handle auth in Express...")
+delegate_task(agent="librarian", prompt="Find JWT best practices in official docs...")
+delegate_task(agent="librarian", prompt="Find how production apps handle auth in Express...")
 // Continue working immediately. Collect with background_output when needed.
 
 // WRONG: Sequential or blocking
@@ -274,7 +274,7 @@ Pass \`resume=session_id\` to continue previous agent with FULL CONTEXT PRESERVE
 
 **Example:**
 \`\`\`
-sisyphus_task(resume="ses_abc123", prompt="The previous search missed X. Also look for Y.")
+delegate_task(resume="ses_abc123", prompt="The previous search missed X. Also look for Y.")
 \`\`\`
 
 ### Search Stop Conditions
diff --git a/src/agents/utils.ts b/src/agents/utils.ts
index 7bf98a51a..cd5c67dba 100644
--- a/src/agents/utils.ts
+++ b/src/agents/utils.ts
@@ -13,7 +13,7 @@ import { createOrchestratorSisyphusAgent, orchestratorSisyphusAgent } from "./or
 import { createMomusAgent } from "./momus"
 import type { AvailableAgent } from "./sisyphus-prompt-builder"
 import { deepMerge } from "../shared"
-import { DEFAULT_CATEGORIES } from "../tools/sisyphus-task/constants"
+import { DEFAULT_CATEGORIES } from "../tools/delegate-task/constants"
 import { resolveMultipleSkills } from "../features/opencode-skill-loader/skill-content"
 
 type AgentSource = AgentFactory | AgentConfig
diff --git a/src/config/schema.ts b/src/config/schema.ts
index edd40bb2a..1d1c38516 100644
--- a/src/config/schema.ts
+++ b/src/config/schema.ts
@@ -84,7 +84,7 @@ export const HookNameSchema = z.enum([
   "claude-code-hooks",
   "auto-slash-command",
   "edit-error-recovery",
-  "sisyphus-task-retry",
+  "delegate-task-retry",
   "prometheus-md-only",
   "start-work",
   "sisyphus-orchestrator",
diff --git a/src/features/AGENTS.md b/src/features/AGENTS.md
index 5bd154ccd..64cc94b40 100644
--- a/src/features/AGENTS.md
+++ b/src/features/AGENTS.md
@@ -61,7 +61,7 @@ features/
 - Session-scoped MCP server lifecycle management
 
 ## ANTI-PATTERNS
-- Sequential execution for independent tasks (use `sisyphus_task`)
+- Sequential execution for independent tasks (use `delegate_task`)
 - Trusting agent self-reports without verification
 - Blocking main thread during loader initialization
 - Manual version bumping in `package.json`
diff --git a/src/features/background-agent/manager.test.ts b/src/features/background-agent/manager.test.ts
index 304cf99dd..8e275a6de 100644
--- a/src/features/background-agent/manager.test.ts
+++ b/src/features/background-agent/manager.test.ts
@@ -980,7 +980,7 @@ describe("BackgroundManager.trackTask", () => {
       sessionID: "session-1",
       parentSessionID: "parent-session",
       description: "external task",
-      agent: "sisyphus_task",
+      agent: "delegate_task",
       concurrencyKey: "external-key",
     }
 
@@ -1015,7 +1015,7 @@ describe("BackgroundManager.resume concurrency key", () => {
       sessionID: "session-1",
       parentSessionID: "parent-session",
       description: "external task",
-      agent: "sisyphus_task",
+      agent: "delegate_task",
       concurrencyKey: "external-key",
     })
 
diff --git a/src/features/background-agent/manager.ts b/src/features/background-agent/manager.ts
index 39ead85ee..9729acccc 100644
--- a/src/features/background-agent/manager.ts
+++ b/src/features/background-agent/manager.ts
@@ -180,7 +180,7 @@ export class BackgroundManager {
         tools: {
           ...getAgentToolRestrictions(input.agent),
           task: false,
-          sisyphus_task: false,
+          delegate_task: false,
           call_omo_agent: true,
         },
         parts: [{ type: "text", text: input.prompt }],
@@ -249,7 +249,7 @@ export class BackgroundManager {
   }
 
   /**
-   * Track a task created elsewhere (e.g., from sisyphus_task) for notification tracking.
+   * Track a task created elsewhere (e.g., from delegate_task) for notification tracking.
    * This allows tasks created by other tools to receive the same toast/prompt notifications.
    */
   async trackTask(input: {
@@ -296,7 +296,7 @@ export class BackgroundManager {
       return existingTask
     }
 
-    const concurrencyGroup = input.concurrencyKey ?? input.agent ?? "sisyphus_task"
+    const concurrencyGroup = input.concurrencyKey ?? input.agent ?? "delegate_task"
 
     // Acquire concurrency slot if a key is provided
     if (input.concurrencyKey) {
@@ -310,7 +310,7 @@ export class BackgroundManager {
       parentMessageID: "",
       description: input.description,
       prompt: "",
-      agent: input.agent || "sisyphus_task",
+      agent: input.agent || "delegate_task",
       status: "running",
       startedAt: new Date(),
       progress: {
@@ -409,7 +409,7 @@ export class BackgroundManager {
         tools: {
           ...getAgentToolRestrictions(existingTask.agent),
           task: false,
-          sisyphus_task: false,
+          delegate_task: false,
           call_omo_agent: true,
         },
         parts: [{ type: "text", text: input.prompt }],
diff --git a/src/features/builtin-commands/templates/init-deep.ts b/src/features/builtin-commands/templates/init-deep.ts
index 2f3eeed6e..2cd07caa1 100644
--- a/src/features/builtin-commands/templates/init-deep.ts
+++ b/src/features/builtin-commands/templates/init-deep.ts
@@ -45,12 +45,12 @@ Don't wait—these run async while main session works.
 
 \`\`\`
 // Fire all at once, collect results later
-sisyphus_task(agent="explore", prompt="Project structure: PREDICT standard patterns for detected language → REPORT deviations only")
-sisyphus_task(agent="explore", prompt="Entry points: FIND main files → REPORT non-standard organization")
-sisyphus_task(agent="explore", prompt="Conventions: FIND config files (.eslintrc, pyproject.toml, .editorconfig) → REPORT project-specific rules")
-sisyphus_task(agent="explore", prompt="Anti-patterns: FIND 'DO NOT', 'NEVER', 'ALWAYS', 'DEPRECATED' comments → LIST forbidden patterns")
-sisyphus_task(agent="explore", prompt="Build/CI: FIND .github/workflows, Makefile → REPORT non-standard patterns")
-sisyphus_task(agent="explore", prompt="Test patterns: FIND test configs, test structure → REPORT unique conventions")
+delegate_task(agent="explore", prompt="Project structure: PREDICT standard patterns for detected language → REPORT deviations only")
+delegate_task(agent="explore", prompt="Entry points: FIND main files → REPORT non-standard organization")
+delegate_task(agent="explore", prompt="Conventions: FIND config files (.eslintrc, pyproject.toml, .editorconfig) → REPORT project-specific rules")
+delegate_task(agent="explore", prompt="Anti-patterns: FIND 'DO NOT', 'NEVER', 'ALWAYS', 'DEPRECATED' comments → LIST forbidden patterns")
+delegate_task(agent="explore", prompt="Build/CI: FIND .github/workflows, Makefile → REPORT non-standard patterns")
+delegate_task(agent="explore", prompt="Test patterns: FIND test configs, test structure → REPORT unique conventions")
 \`\`\`
 
 <dynamic-agents>
@@ -76,9 +76,9 @@ max_depth=$(find . -type d -not -path '*/node_modules/*' -not -path '*/.git/*' |
 Example spawning:
 \`\`\`
 // 500 files, 50k lines, depth 6, 15 large files → spawn 5+5+2+1 = 13 additional agents
-sisyphus_task(agent="explore", prompt="Large file analysis: FIND files >500 lines, REPORT complexity hotspots")
-sisyphus_task(agent="explore", prompt="Deep modules at depth 4+: FIND hidden patterns, internal conventions")
-sisyphus_task(agent="explore", prompt="Cross-cutting concerns: FIND shared utilities across directories")
+delegate_task(agent="explore", prompt="Large file analysis: FIND files >500 lines, REPORT complexity hotspots")
+delegate_task(agent="explore", prompt="Deep modules at depth 4+: FIND hidden patterns, internal conventions")
+delegate_task(agent="explore", prompt="Cross-cutting concerns: FIND shared utilities across directories")
 // ... more based on calculation
 \`\`\`
 </dynamic-agents>
@@ -240,7 +240,7 @@ Launch document-writer agents for each location:
 
 \`\`\`
 for loc in AGENTS_LOCATIONS (except root):
-  sisyphus_task(agent="document-writer", prompt=\\\`
+  delegate_task(agent="document-writer", prompt=\\\`
     Generate AGENTS.md for: \${loc.path}
     - Reason: \${loc.reason}
     - 30-80 lines max
diff --git a/src/features/builtin-skills/git-master/SKILL.md b/src/features/builtin-skills/git-master/SKILL.md
index d1baece0b..edd0a9780 100644
--- a/src/features/builtin-skills/git-master/SKILL.md
+++ b/src/features/builtin-skills/git-master/SKILL.md
@@ -1,6 +1,6 @@
 ---
 name: git-master
-description: "MUST USE for ANY git operations. Atomic commits, rebase/squash, history search (blame, bisect, log -S). STRONGLY RECOMMENDED: Use with sisyphus_task(category='quick', skills=['git-master'], ...) to save context. Triggers: 'commit', 'rebase', 'squash', 'who wrote', 'when was X added', 'find the commit that'."
+description: "MUST USE for ANY git operations. Atomic commits, rebase/squash, history search (blame, bisect, log -S). STRONGLY RECOMMENDED: Use with delegate_task(category='quick', skills=['git-master'], ...) to save context. Triggers: 'commit', 'rebase', 'squash', 'who wrote', 'when was X added', 'find the commit that'."
 ---
 
 # Git Master Agent
diff --git a/src/features/builtin-skills/skills.ts b/src/features/builtin-skills/skills.ts
index cde373217..75cc9e5eb 100644
--- a/src/features/builtin-skills/skills.ts
+++ b/src/features/builtin-skills/skills.ts
@@ -95,7 +95,7 @@ Interpret creatively and make unexpected choices that feel genuinely designed fo
 const gitMasterSkill: BuiltinSkill = {
   name: "git-master",
   description:
-    "MUST USE for ANY git operations. Atomic commits, rebase/squash, history search (blame, bisect, log -S). STRONGLY RECOMMENDED: Use with sisyphus_task(category='quick', skills=['git-master'], ...) to save context. Triggers: 'commit', 'rebase', 'squash', 'who wrote', 'when was X added', 'find the commit that'.",
+    "MUST USE for ANY git operations. Atomic commits, rebase/squash, history search (blame, bisect, log -S). STRONGLY RECOMMENDED: Use with delegate_task(category='quick', skills=['git-master'], ...) to save context. Triggers: 'commit', 'rebase', 'squash', 'who wrote', 'when was X added', 'find the commit that'.",
   template: `# Git Master Agent
 
 You are a Git expert combining three specializations:
diff --git a/src/hooks/agent-usage-reminder/constants.ts b/src/hooks/agent-usage-reminder/constants.ts
index 71bd37754..a39ea04ad 100644
--- a/src/hooks/agent-usage-reminder/constants.ts
+++ b/src/hooks/agent-usage-reminder/constants.ts
@@ -24,7 +24,7 @@ export const TARGET_TOOLS = new Set([
 export const AGENT_TOOLS = new Set([
   "task",
   "call_omo_agent",
-  "sisyphus_task",
+  "delegate_task",
 ]);
 
 export const REMINDER_MESSAGE = `
@@ -32,13 +32,13 @@ export const REMINDER_MESSAGE = `
 
 You called a search/fetch tool directly without leveraging specialized agents.
 
-RECOMMENDED: Use sisyphus_task with explore/librarian agents for better results:
+RECOMMENDED: Use delegate_task with explore/librarian agents for better results:
 
 \`\`\`
 // Parallel exploration - fire multiple agents simultaneously
-sisyphus_task(agent="explore", prompt="Find all files matching pattern X")
-sisyphus_task(agent="explore", prompt="Search for implementation of Y") 
-sisyphus_task(agent="librarian", prompt="Lookup documentation for Z")
+delegate_task(agent="explore", prompt="Find all files matching pattern X")
+delegate_task(agent="explore", prompt="Search for implementation of Y") 
+delegate_task(agent="librarian", prompt="Lookup documentation for Z")
 
 // Then continue your work while they run in background
 // System will notify you when each completes
@@ -50,5 +50,5 @@ WHY:
 - Specialized agents have domain expertise
 - Reduces context window usage in main session
 
-ALWAYS prefer: Multiple parallel sisyphus_task calls > Direct tool calls
+ALWAYS prefer: Multiple parallel delegate_task calls > Direct tool calls
 `;
diff --git a/src/hooks/claude-code-hooks/index.ts b/src/hooks/claude-code-hooks/index.ts
index 795dcda83..0153eb6ea 100644
--- a/src/hooks/claude-code-hooks/index.ts
+++ b/src/hooks/claude-code-hooks/index.ts
@@ -145,13 +145,7 @@ export function createClaudeCodeHooksHook(
           const hookContent = result.messages.join("\n\n")
           log(`[claude-code-hooks] Injecting ${result.messages.length} hook messages`, { sessionID: input.sessionID, contentLength: hookContent.length, isFirstMessage })
 
-          if (isFirstMessage) {
-            const idx = output.parts.findIndex((p) => p.type === "text" && p.text)
-            if (idx >= 0) {
-              output.parts[idx].text = `${hookContent}\n\n${output.parts[idx].text ?? ""}`
-              log("UserPromptSubmit hooks prepended to first message parts directly", { sessionID: input.sessionID })
-            }
-          } else if (contextCollector) {
+          if (contextCollector) {
             log("[DEBUG] Registering hook content to contextCollector", {
               sessionID: input.sessionID,
               contentLength: hookContent.length,
@@ -168,14 +162,6 @@ export function createClaudeCodeHooksHook(
               sessionID: input.sessionID,
               contentLength: hookContent.length,
             })
-          } else {
-            const idx = output.parts.findIndex((p) => p.type === "text" && p.text)
-            if (idx >= 0) {
-              output.parts[idx].text = `${hookContent}\n\n${output.parts[idx].text ?? ""}`
-              log("Hook content prepended to message (fallback)", {
-                sessionID: input.sessionID,
-              })
-            }
           }
         }
       }
@@ -257,7 +243,7 @@ export function createClaudeCodeHooksHook(
       const cachedInput = getToolInput(input.sessionID, input.tool, input.callID) || {}
 
       // Use metadata if available and non-empty, otherwise wrap output.output in a structured object
-      // This ensures plugin tools (call_omo_agent, sisyphus_task, task) that return strings
+      // This ensures plugin tools (call_omo_agent, delegate_task, task) that return strings
       // get their results properly recorded in transcripts instead of empty {}
       const metadata = output.metadata as Record<string, unknown> | undefined
       const hasMetadata = metadata && typeof metadata === "object" && Object.keys(metadata).length > 0
diff --git a/src/hooks/sisyphus-task-retry/index.test.ts b/src/hooks/delegate-task-retry/index.test.ts
similarity index 84%
rename from src/hooks/sisyphus-task-retry/index.test.ts
rename to src/hooks/delegate-task-retry/index.test.ts
index c9899b46b..016d8ce4b 100644
--- a/src/hooks/sisyphus-task-retry/index.test.ts
+++ b/src/hooks/delegate-task-retry/index.test.ts
@@ -1,18 +1,18 @@
 import { describe, expect, it } from "bun:test"
 import {
-  SISYPHUS_TASK_ERROR_PATTERNS,
-  detectSisyphusTaskError,
+  DELEGATE_TASK_ERROR_PATTERNS,
+  detectDelegateTaskError,
   buildRetryGuidance,
 } from "./index"
 
 describe("sisyphus-task-retry", () => {
-  describe("SISYPHUS_TASK_ERROR_PATTERNS", () => {
+  describe("DELEGATE_TASK_ERROR_PATTERNS", () => {
     // #given error patterns are defined
-    // #then should include all known sisyphus_task error types
+    // #then should include all known delegate_task error types
     it("should contain all known error patterns", () => {
-      expect(SISYPHUS_TASK_ERROR_PATTERNS.length).toBeGreaterThan(5)
+      expect(DELEGATE_TASK_ERROR_PATTERNS.length).toBeGreaterThan(5)
       
-      const patternTexts = SISYPHUS_TASK_ERROR_PATTERNS.map(p => p.pattern)
+      const patternTexts = DELEGATE_TASK_ERROR_PATTERNS.map(p => p.pattern)
       expect(patternTexts).toContain("run_in_background")
       expect(patternTexts).toContain("skills")
       expect(patternTexts).toContain("category OR subagent_type")
@@ -21,14 +21,14 @@ describe("sisyphus-task-retry", () => {
     })
   })
 
-  describe("detectSisyphusTaskError", () => {
+  describe("detectDelegateTaskError", () => {
     // #given tool output with run_in_background error
     // #when detecting error
     // #then should return matching error info
     it("should detect run_in_background missing error", () => {
       const output = "❌ Invalid arguments: 'run_in_background' parameter is REQUIRED. Use run_in_background=false for task delegation."
       
-      const result = detectSisyphusTaskError(output)
+      const result = detectDelegateTaskError(output)
       
       expect(result).not.toBeNull()
       expect(result?.errorType).toBe("missing_run_in_background")
@@ -37,7 +37,7 @@ describe("sisyphus-task-retry", () => {
     it("should detect skills missing error", () => {
       const output = "❌ Invalid arguments: 'skills' parameter is REQUIRED. Use skills=[] if no skills needed."
       
-      const result = detectSisyphusTaskError(output)
+      const result = detectDelegateTaskError(output)
       
       expect(result).not.toBeNull()
       expect(result?.errorType).toBe("missing_skills")
@@ -46,7 +46,7 @@ describe("sisyphus-task-retry", () => {
     it("should detect category/subagent mutual exclusion error", () => {
       const output = "❌ Invalid arguments: Provide EITHER category OR subagent_type, not both."
       
-      const result = detectSisyphusTaskError(output)
+      const result = detectDelegateTaskError(output)
       
       expect(result).not.toBeNull()
       expect(result?.errorType).toBe("mutual_exclusion")
@@ -55,7 +55,7 @@ describe("sisyphus-task-retry", () => {
     it("should detect unknown category error", () => {
       const output = '❌ Unknown category: "invalid-cat". Available: visual-engineering, ultrabrain, quick'
       
-      const result = detectSisyphusTaskError(output)
+      const result = detectDelegateTaskError(output)
       
       expect(result).not.toBeNull()
       expect(result?.errorType).toBe("unknown_category")
@@ -64,7 +64,7 @@ describe("sisyphus-task-retry", () => {
     it("should detect unknown agent error", () => {
       const output = '❌ Unknown agent: "fake-agent". Available agents: explore, librarian, oracle'
       
-      const result = detectSisyphusTaskError(output)
+      const result = detectDelegateTaskError(output)
       
       expect(result).not.toBeNull()
       expect(result?.errorType).toBe("unknown_agent")
@@ -73,7 +73,7 @@ describe("sisyphus-task-retry", () => {
     it("should return null for successful output", () => {
       const output = "Background task launched.\n\nTask ID: bg_12345\nSession ID: ses_abc"
       
-      const result = detectSisyphusTaskError(output)
+      const result = detectDelegateTaskError(output)
       
       expect(result).toBeNull()
     })
diff --git a/src/hooks/sisyphus-task-retry/index.ts b/src/hooks/delegate-task-retry/index.ts
similarity index 80%
rename from src/hooks/sisyphus-task-retry/index.ts
rename to src/hooks/delegate-task-retry/index.ts
index 91b0645a1..96ed41e8d 100644
--- a/src/hooks/sisyphus-task-retry/index.ts
+++ b/src/hooks/delegate-task-retry/index.ts
@@ -1,12 +1,12 @@
 import type { PluginInput } from "@opencode-ai/plugin"
 
-export interface SisyphusTaskErrorPattern {
+export interface DelegateTaskErrorPattern {
   pattern: string
   errorType: string
   fixHint: string
 }
 
-export const SISYPHUS_TASK_ERROR_PATTERNS: SisyphusTaskErrorPattern[] = [
+export const DELEGATE_TASK_ERROR_PATTERNS: DelegateTaskErrorPattern[] = [
   {
     pattern: "run_in_background",
     errorType: "missing_run_in_background",
@@ -45,7 +45,7 @@ export const SISYPHUS_TASK_ERROR_PATTERNS: SisyphusTaskErrorPattern[] = [
   {
     pattern: "Cannot call primary agent",
     errorType: "primary_agent",
-    fixHint: "Primary agents cannot be called via sisyphus_task. Use a subagent like 'explore', 'oracle', or 'librarian'",
+    fixHint: "Primary agents cannot be called via delegate_task. Use a subagent like 'explore', 'oracle', or 'librarian'",
   },
   {
     pattern: "Skills not found",
@@ -59,10 +59,10 @@ export interface DetectedError {
   originalOutput: string
 }
 
-export function detectSisyphusTaskError(output: string): DetectedError | null {
+export function detectDelegateTaskError(output: string): DetectedError | null {
   if (!output.includes("❌")) return null
 
-  for (const errorPattern of SISYPHUS_TASK_ERROR_PATTERNS) {
+  for (const errorPattern of DELEGATE_TASK_ERROR_PATTERNS) {
     if (output.includes(errorPattern.pattern)) {
       return {
         errorType: errorPattern.errorType,
@@ -80,16 +80,16 @@ function extractAvailableList(output: string): string | null {
 }
 
 export function buildRetryGuidance(errorInfo: DetectedError): string {
-  const pattern = SISYPHUS_TASK_ERROR_PATTERNS.find(
+  const pattern = DELEGATE_TASK_ERROR_PATTERNS.find(
     (p) => p.errorType === errorInfo.errorType
   )
 
   if (!pattern) {
-    return `[sisyphus_task ERROR] Fix the error and retry with correct parameters.`
+    return `[delegate_task ERROR] Fix the error and retry with correct parameters.`
   }
 
   let guidance = `
-[sisyphus_task CALL FAILED - IMMEDIATE RETRY REQUIRED]
+[delegate_task CALL FAILED - IMMEDIATE RETRY REQUIRED]
 
 **Error Type**: ${errorInfo.errorType}
 **Fix**: ${pattern.fixHint}
@@ -101,11 +101,11 @@ export function buildRetryGuidance(errorInfo: DetectedError): string {
   }
 
   guidance += `
-**Action**: Retry sisyphus_task NOW with corrected parameters.
+**Action**: Retry delegate_task NOW with corrected parameters.
 
 Example of CORRECT call:
 \`\`\`
-sisyphus_task(
+delegate_task(
   description="Task description",
   prompt="Detailed prompt...",
   category="general",  // OR subagent_type="explore"
@@ -118,15 +118,15 @@ sisyphus_task(
   return guidance
 }
 
-export function createSisyphusTaskRetryHook(_ctx: PluginInput) {
+export function createDelegateTaskRetryHook(_ctx: PluginInput) {
   return {
     "tool.execute.after": async (
       input: { tool: string; sessionID: string; callID: string },
       output: { title: string; output: string; metadata: unknown }
     ) => {
-      if (input.tool.toLowerCase() !== "sisyphus_task") return
+      if (input.tool.toLowerCase() !== "delegate_task") return
 
-      const errorInfo = detectSisyphusTaskError(output.output)
+      const errorInfo = detectDelegateTaskError(output.output)
       if (errorInfo) {
         const guidance = buildRetryGuidance(errorInfo)
         output.output += `\n${guidance}`
diff --git a/src/hooks/index.ts b/src/hooks/index.ts
index f5fadfa89..e3ae2e22e 100644
--- a/src/hooks/index.ts
+++ b/src/hooks/index.ts
@@ -30,4 +30,4 @@ export { createPrometheusMdOnlyHook } from "./prometheus-md-only";
 export { createTaskResumeInfoHook } from "./task-resume-info";
 export { createStartWorkHook } from "./start-work";
 export { createSisyphusOrchestratorHook } from "./sisyphus-orchestrator";
-export { createSisyphusTaskRetryHook } from "./sisyphus-task-retry";
+export { createDelegateTaskRetryHook } from "./delegate-task-retry";
diff --git a/src/hooks/keyword-detector/constants.ts b/src/hooks/keyword-detector/constants.ts
index d411313e5..df3bd3a93 100644
--- a/src/hooks/keyword-detector/constants.ts
+++ b/src/hooks/keyword-detector/constants.ts
@@ -12,7 +12,7 @@ You ARE the planner. You ARE NOT an implementer. You DO NOT write code. You DO N
 | Write/Edit | \`.sisyphus/**/*.md\` ONLY | Everything else |
 | Read | All files | - |
 | Bash | Research commands only | Implementation commands |
-| sisyphus_task | explore, librarian | - |
+| delegate_task | explore, librarian | - |
 
 **IF YOU TRY TO WRITE/EDIT OUTSIDE \`.sisyphus/\`:**
 - System will BLOCK your action
@@ -36,9 +36,9 @@ You ARE the planner. Your job: create bulletproof work plans.
 ### Research Protocol
 1. **Fire parallel background agents** for comprehensive context:
    \`\`\`
-   sisyphus_task(agent="explore", prompt="Find existing patterns for [topic] in codebase", background=true)
-   sisyphus_task(agent="explore", prompt="Find test infrastructure and conventions", background=true)
-   sisyphus_task(agent="librarian", prompt="Find official docs and best practices for [technology]", background=true)
+   delegate_task(agent="explore", prompt="Find existing patterns for [topic] in codebase", background=true)
+   delegate_task(agent="explore", prompt="Find test infrastructure and conventions", background=true)
+   delegate_task(agent="librarian", prompt="Find official docs and best practices for [technology]", background=true)
    \`\`\`
 2. **Wait for results** before planning - rushed plans fail
 3. **Synthesize findings** into informed requirements
@@ -101,14 +101,14 @@ TELL THE USER WHAT AGENTS YOU WILL LEVERAGE NOW TO SATISFY USER'S REQUEST.
 
 ## EXECUTION RULES
 - **TODO**: Track EVERY step. Mark complete IMMEDIATELY after each.
-- **PARALLEL**: Fire independent agent calls simultaneously via sisyphus_task(background=true) - NEVER wait sequentially.
-- **BACKGROUND FIRST**: Use sisyphus_task for exploration/research agents (10+ concurrent if needed).
+- **PARALLEL**: Fire independent agent calls simultaneously via delegate_task(background=true) - NEVER wait sequentially.
+- **BACKGROUND FIRST**: Use delegate_task for exploration/research agents (10+ concurrent if needed).
 - **VERIFY**: Re-read request after completion. Check ALL requirements met before reporting done.
 - **DELEGATE**: Don't do everything yourself - orchestrate specialized agents for their strengths.
 
 ## WORKFLOW
 1. Analyze the request and identify required capabilities
-2. Spawn exploration/librarian agents via sisyphus_task(background=true) in PARALLEL (10+ if needed)
+2. Spawn exploration/librarian agents via delegate_task(background=true) in PARALLEL (10+ if needed)
 3. Always Use Plan agent with gathered context to create detailed work breakdown
 4. Execute with continuous verification against original requirements
 
diff --git a/src/hooks/prometheus-md-only/index.test.ts b/src/hooks/prometheus-md-only/index.test.ts
index c3a186f44..d6086f6c8 100644
--- a/src/hooks/prometheus-md-only/index.test.ts
+++ b/src/hooks/prometheus-md-only/index.test.ts
@@ -154,11 +154,11 @@ describe("prometheus-md-only", () => {
       ).resolves.toBeUndefined()
     })
 
-    test("should inject read-only warning when Prometheus calls sisyphus_task", async () => {
+    test("should inject read-only warning when Prometheus calls delegate_task", async () => {
       // #given
       const hook = createPrometheusMdOnlyHook(createMockPluginInput())
       const input = {
-        tool: "sisyphus_task",
+        tool: "delegate_task",
         sessionID: TEST_SESSION_ID,
         callID: "call-1",
       }
@@ -216,7 +216,7 @@ describe("prometheus-md-only", () => {
       // #given
       const hook = createPrometheusMdOnlyHook(createMockPluginInput())
       const input = {
-        tool: "sisyphus_task",
+        tool: "delegate_task",
         sessionID: TEST_SESSION_ID,
         callID: "call-1",
       }
@@ -257,11 +257,11 @@ describe("prometheus-md-only", () => {
       ).resolves.toBeUndefined()
     })
 
-    test("should not inject warning for non-Prometheus agents calling sisyphus_task", async () => {
+    test("should not inject warning for non-Prometheus agents calling delegate_task", async () => {
       // #given
       const hook = createPrometheusMdOnlyHook(createMockPluginInput())
       const input = {
-        tool: "sisyphus_task",
+        tool: "delegate_task",
         sessionID: TEST_SESSION_ID,
         callID: "call-1",
       }
diff --git a/src/hooks/prometheus-md-only/index.ts b/src/hooks/prometheus-md-only/index.ts
index 470e870a3..dcb800344 100644
--- a/src/hooks/prometheus-md-only/index.ts
+++ b/src/hooks/prometheus-md-only/index.ts
@@ -61,7 +61,7 @@ function getMessageDir(sessionID: string): string | null {
   return null
 }
 
-const TASK_TOOLS = ["sisyphus_task", "task", "call_omo_agent"]
+const TASK_TOOLS = ["delegate_task", "task", "call_omo_agent"]
 
 function getAgentFromMessageFiles(sessionID: string): string | undefined {
   const messageDir = getMessageDir(sessionID)
diff --git a/src/hooks/sisyphus-orchestrator/index.test.ts b/src/hooks/sisyphus-orchestrator/index.test.ts
index d306b7de3..fda298c90 100644
--- a/src/hooks/sisyphus-orchestrator/index.test.ts
+++ b/src/hooks/sisyphus-orchestrator/index.test.ts
@@ -66,8 +66,8 @@ describe("sisyphus-orchestrator hook", () => {
   })
 
   describe("tool.execute.after handler", () => {
-    test("should ignore non-sisyphus_task tools", async () => {
-      // #given - hook and non-sisyphus_task tool
+    test("should ignore non-delegate_task tools", async () => {
+      // #given - hook and non-delegate_task tool
       const hook = createSisyphusOrchestratorHook(createMockPluginInput())
       const output = {
         title: "Test Tool",
@@ -110,7 +110,7 @@ describe("sisyphus-orchestrator hook", () => {
 
       // #when
       await hook["tool.execute.after"](
-        { tool: "sisyphus_task", sessionID },
+        { tool: "delegate_task", sessionID },
         output
       )
 
@@ -134,14 +134,14 @@ describe("sisyphus-orchestrator hook", () => {
 
       // #when
       await hook["tool.execute.after"](
-        { tool: "sisyphus_task", sessionID },
+        { tool: "delegate_task", sessionID },
         output
       )
 
       // #then - standalone verification reminder appended
       expect(output.output).toContain("Task completed successfully")
       expect(output.output).toContain("MANDATORY:")
-      expect(output.output).toContain("sisyphus_task(resume=")
+      expect(output.output).toContain("delegate_task(resume=")
       
       cleanupMessageStorage(sessionID)
     })
@@ -171,7 +171,7 @@ describe("sisyphus-orchestrator hook", () => {
 
       // #when
       await hook["tool.execute.after"](
-        { tool: "sisyphus_task", sessionID },
+        { tool: "delegate_task", sessionID },
         output
       )
 
@@ -180,7 +180,7 @@ describe("sisyphus-orchestrator hook", () => {
       expect(output.output).toContain("SUBAGENT WORK COMPLETED")
       expect(output.output).toContain("test-plan")
       expect(output.output).toContain("LIE")
-      expect(output.output).toContain("sisyphus_task(resume=")
+      expect(output.output).toContain("delegate_task(resume=")
       
       cleanupMessageStorage(sessionID)
     })
@@ -210,7 +210,7 @@ describe("sisyphus-orchestrator hook", () => {
 
       // #when
       await hook["tool.execute.after"](
-        { tool: "sisyphus_task", sessionID },
+        { tool: "delegate_task", sessionID },
         output
       )
 
@@ -247,7 +247,7 @@ describe("sisyphus-orchestrator hook", () => {
 
       // #when
       await hook["tool.execute.after"](
-        { tool: "sisyphus_task", sessionID },
+        { tool: "delegate_task", sessionID },
         output
       )
 
@@ -283,7 +283,7 @@ describe("sisyphus-orchestrator hook", () => {
 
       // #when
       await hook["tool.execute.after"](
-        { tool: "sisyphus_task", sessionID },
+        { tool: "delegate_task", sessionID },
         output
       )
 
@@ -320,7 +320,7 @@ describe("sisyphus-orchestrator hook", () => {
 
       // #when
       await hook["tool.execute.after"](
-        { tool: "sisyphus_task", sessionID },
+        { tool: "delegate_task", sessionID },
         output
       )
 
@@ -357,12 +357,12 @@ describe("sisyphus-orchestrator hook", () => {
 
       // #when
       await hook["tool.execute.after"](
-        { tool: "sisyphus_task", sessionID },
+        { tool: "delegate_task", sessionID },
         output
       )
 
       // #then - should include resume instructions and verification
-      expect(output.output).toContain("sisyphus_task(resume=")
+      expect(output.output).toContain("delegate_task(resume=")
       expect(output.output).toContain("[x]")
       expect(output.output).toContain("MANDATORY:")
       
@@ -398,7 +398,7 @@ describe("sisyphus-orchestrator hook", () => {
         // #then
         expect(output.output).toContain("DELEGATION REQUIRED")
         expect(output.output).toContain("ORCHESTRATOR, not an IMPLEMENTER")
-        expect(output.output).toContain("sisyphus_task")
+        expect(output.output).toContain("delegate_task")
       })
 
       test("should append delegation reminder when orchestrator edits outside .sisyphus/", async () => {
diff --git a/src/hooks/sisyphus-orchestrator/index.ts b/src/hooks/sisyphus-orchestrator/index.ts
index 0c8487a5b..16fc17ce8 100644
--- a/src/hooks/sisyphus-orchestrator/index.ts
+++ b/src/hooks/sisyphus-orchestrator/index.ts
@@ -36,7 +36,7 @@ You just performed direct file modifications outside \`.sisyphus/\`.
 **You are an ORCHESTRATOR, not an IMPLEMENTER.**
 
 As an orchestrator, you should:
-- **DELEGATE** implementation work to subagents via \`sisyphus_task\`
+- **DELEGATE** implementation work to subagents via \`delegate_task\`
 - **VERIFY** the work done by subagents
 - **COORDINATE** multiple tasks and ensure completion
 
@@ -46,7 +46,7 @@ You should NOT:
 - Implement features yourself
 
 **If you need to make changes:**
-1. Use \`sisyphus_task\` to delegate to an appropriate subagent
+1. Use \`delegate_task\` to delegate to an appropriate subagent
 2. Provide clear instructions in the prompt
 3. Verify the subagent's work after completion
 
@@ -120,7 +120,7 @@ You (orchestrator-sisyphus) are attempting to directly modify a file outside \`.
 🚫 **THIS IS FORBIDDEN** (except for VERIFICATION purposes)
 
 As an ORCHESTRATOR, you MUST:
-1. **DELEGATE** all implementation work via \`sisyphus_task\`
+1. **DELEGATE** all implementation work via \`delegate_task\`
 2. **VERIFY** the work done by subagents (reading files is OK)
 3. **COORDINATE** - you orchestrate, you don't implement
 
@@ -138,11 +138,11 @@ As an ORCHESTRATOR, you MUST:
 
 **IF THIS IS FOR VERIFICATION:**
 Proceed if you are verifying subagent work by making a small fix.
-But for any substantial changes, USE \`sisyphus_task\`.
+But for any substantial changes, USE \`delegate_task\`.
 
 **CORRECT APPROACH:**
 \`\`\`
-sisyphus_task(
+delegate_task(
   category="...",
   prompt="[specific single task with clear acceptance criteria]"
 )
@@ -185,7 +185,7 @@ function buildVerificationReminder(sessionId: string): string {
 
 **If ANY verification fails, use this immediately:**
 \`\`\`
-sisyphus_task(resume="${sessionId}", prompt="fix: [describe the specific failure]")
+delegate_task(resume="${sessionId}", prompt="fix: [describe the specific failure]")
 \`\`\``
 }
 
@@ -656,12 +656,12 @@ export function createSisyphusOrchestratorHook(
         return
       }
 
-      // Check sisyphus_task - inject single-task directive
-      if (input.tool === "sisyphus_task") {
+      // Check delegate_task - inject single-task directive
+      if (input.tool === "delegate_task") {
         const prompt = output.args.prompt as string | undefined
         if (prompt && !prompt.includes(SYSTEM_DIRECTIVE_PREFIX)) {
           output.args.prompt = prompt + `\n<system-reminder>${SINGLE_TASK_DIRECTIVE}</system-reminder>`
-          log(`[${HOOK_NAME}] Injected single-task directive to sisyphus_task`, {
+          log(`[${HOOK_NAME}] Injected single-task directive to delegate_task`, {
             sessionID: input.sessionID,
           })
         }
@@ -695,7 +695,7 @@ export function createSisyphusOrchestratorHook(
         return
       }
 
-      if (input.tool !== "sisyphus_task") {
+      if (input.tool !== "delegate_task") {
         return
       }
 
diff --git a/src/hooks/task-resume-info/index.ts b/src/hooks/task-resume-info/index.ts
index 2c42ae2aa..6b731367a 100644
--- a/src/hooks/task-resume-info/index.ts
+++ b/src/hooks/task-resume-info/index.ts
@@ -1,4 +1,4 @@
-const TARGET_TOOLS = ["task", "Task", "call_omo_agent", "sisyphus_task"]
+const TARGET_TOOLS = ["task", "Task", "call_omo_agent", "delegate_task"]
 
 const SESSION_ID_PATTERNS = [
   /Session ID: (ses_[a-zA-Z0-9_-]+)/,
@@ -27,7 +27,7 @@ export function createTaskResumeInfoHook() {
     const sessionId = extractSessionId(output.output)
     if (!sessionId) return
 
-    output.output = output.output.trimEnd() + `\n\nto resume: sisyphus_task(resume="${sessionId}", prompt="...")`
+    output.output = output.output.trimEnd() + `\n\nto resume: delegate_task(resume="${sessionId}", prompt="...")`
   }
 
   return {
diff --git a/src/index.ts b/src/index.ts
index 9c23dee04..a41bfef27 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -26,7 +26,7 @@ import {
   createRalphLoopHook,
   createAutoSlashCommandHook,
   createEditErrorRecoveryHook,
-  createSisyphusTaskRetryHook,
+  createDelegateTaskRetryHook,
   createTaskResumeInfoHook,
   createStartWorkHook,
   createSisyphusOrchestratorHook,
@@ -64,7 +64,7 @@ import {
   createSlashcommandTool,
   discoverCommandsSync,
   sessionExists,
-  createSisyphusTask,
+  createDelegateTask,
   interactive_bash,
   startTmuxCheck,
   lspManager,
@@ -193,8 +193,8 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
     ? createEditErrorRecoveryHook(ctx)
     : null;
 
-  const sisyphusTaskRetry = isHookEnabled("sisyphus-task-retry")
-    ? createSisyphusTaskRetryHook(ctx)
+  const delegateTaskRetry = isHookEnabled("delegate-task-retry")
+    ? createDelegateTaskRetryHook(ctx)
     : null;
 
   const startWork = isHookEnabled("start-work")
@@ -233,7 +233,7 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
 
   const callOmoAgent = createCallOmoAgent(ctx, backgroundManager);
   const lookAt = createLookAt(ctx);
-  const sisyphusTask = createSisyphusTask({
+  const delegateTask = createDelegateTask({
     manager: backgroundManager,
     client: ctx.client,
     directory: ctx.directory,
@@ -302,7 +302,7 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
       ...backgroundTools,
       call_omo_agent: callOmoAgent,
       look_at: lookAt,
-      sisyphus_task: sisyphusTask,
+      delegate_task: delegateTask,
       skill: skillTool,
       skill_mcp: skillMcpTool,
       slashcommand: slashcommandTool,
@@ -502,7 +502,7 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
 
         args.tools = {
           ...(args.tools as Record<string, boolean> | undefined),
-          sisyphus_task: false,
+          delegate_task: false,
           ...(isExploreOrLibrarian ? { call_omo_agent: false } : {}),
         };
       }
@@ -550,7 +550,7 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
       await agentUsageReminder?.["tool.execute.after"](input, output);
       await interactiveBashSession?.["tool.execute.after"](input, output);
 await editErrorRecovery?.["tool.execute.after"](input, output);
-        await sisyphusTaskRetry?.["tool.execute.after"](input, output);
+        await delegateTaskRetry?.["tool.execute.after"](input, output);
         await sisyphusOrchestrator?.["tool.execute.after"]?.(input, output);
       await taskResumeInfo["tool.execute.after"](input, output);
     },
diff --git a/src/plugin-handlers/config-handler.ts b/src/plugin-handlers/config-handler.ts
index 0d68de6ae..a6d37cd6f 100644
--- a/src/plugin-handlers/config-handler.ts
+++ b/src/plugin-handlers/config-handler.ts
@@ -24,7 +24,7 @@ import type { OhMyOpenCodeConfig } from "../config";
 import { log } from "../shared";
 import { migrateAgentConfig } from "../shared/permission-compat";
 import { PROMETHEUS_SYSTEM_PROMPT, PROMETHEUS_PERMISSION } from "../agents/prometheus-prompt";
-import { DEFAULT_CATEGORIES } from "../tools/sisyphus-task/constants";
+import { DEFAULT_CATEGORIES } from "../tools/delegate-task/constants";
 import type { ModelCacheState } from "../plugin-state";
 import type { CategoryConfig } from "../config/schema";
 
@@ -303,26 +303,26 @@ export function createConfigHandler(deps: ConfigHandlerDeps) {
     }
     if (agentResult["orchestrator-sisyphus"]) {
       const agent = agentResult["orchestrator-sisyphus"] as AgentWithPermission;
-      agent.permission = { ...agent.permission, task: "deny", call_omo_agent: "deny", sisyphus_task: "allow" };
+      agent.permission = { ...agent.permission, task: "deny", call_omo_agent: "deny", delegate_task: "allow" };
     }
     if (agentResult.Sisyphus) {
       const agent = agentResult.Sisyphus as AgentWithPermission;
-      agent.permission = { ...agent.permission, call_omo_agent: "deny", sisyphus_task: "allow" };
+      agent.permission = { ...agent.permission, call_omo_agent: "deny", delegate_task: "allow" };
     }
     if (agentResult["Prometheus (Planner)"]) {
       const agent = agentResult["Prometheus (Planner)"] as AgentWithPermission;
-      agent.permission = { ...agent.permission, call_omo_agent: "deny", sisyphus_task: "allow" };
+      agent.permission = { ...agent.permission, call_omo_agent: "deny", delegate_task: "allow" };
     }
     if (agentResult["Sisyphus-Junior"]) {
       const agent = agentResult["Sisyphus-Junior"] as AgentWithPermission;
-      agent.permission = { ...agent.permission, sisyphus_task: "allow" };
+      agent.permission = { ...agent.permission, delegate_task: "allow" };
     }
 
     config.permission = {
       ...(config.permission as Record<string, unknown>),
       webfetch: "allow",
       external_directory: "allow",
-      sisyphus_task: "deny",
+      delegate_task: "deny",
     };
 
     const mcpResult = (pluginConfig.claude_code?.mcp ?? true)
diff --git a/src/shared/agent-tool-restrictions.ts b/src/shared/agent-tool-restrictions.ts
index 7ee7daf34..9f648f08c 100644
--- a/src/shared/agent-tool-restrictions.ts
+++ b/src/shared/agent-tool-restrictions.ts
@@ -10,7 +10,7 @@ const EXPLORATION_AGENT_DENYLIST: Record<string, PermissionValue> = {
   write: "deny",
   edit: "deny",
   task: "deny",
-  sisyphus_task: "deny",
+  delegate_task: "deny",
   call_omo_agent: "deny",
 }
 
@@ -23,7 +23,7 @@ const AGENT_RESTRICTIONS: Record<string, Record<string, PermissionValue>> = {
     write: "deny",
     edit: "deny",
     task: "deny",
-    sisyphus_task: "deny",
+    delegate_task: "deny",
   },
 
   "multimodal-looker": {
@@ -33,19 +33,19 @@ const AGENT_RESTRICTIONS: Record<string, Record<string, PermissionValue>> = {
 
   "document-writer": {
     task: "deny",
-    sisyphus_task: "deny",
+    delegate_task: "deny",
     call_omo_agent: "deny",
   },
 
   "frontend-ui-ux-engineer": {
     task: "deny",
-    sisyphus_task: "deny",
+    delegate_task: "deny",
     call_omo_agent: "deny",
   },
 
   "Sisyphus-Junior": {
     task: "deny",
-    sisyphus_task: "deny",
+    delegate_task: "deny",
   },
 }
 
diff --git a/src/tools/AGENTS.md b/src/tools/AGENTS.md
index 26243e95e..0d9c82528 100644
--- a/src/tools/AGENTS.md
+++ b/src/tools/AGENTS.md
@@ -34,7 +34,7 @@ tools/
 | AST | ast_grep_search, ast_grep_replace | Structural pattern matching/rewriting |
 | Search | grep, glob | Timeout-safe file and content search |
 | Session | session_list, session_read, session_search, session_info | History navigation and retrieval |
-| Background | sisyphus_task, background_output, background_cancel | Parallel agent orchestration |
+| Background | delegate_task, background_output, background_cancel | Parallel agent orchestration |
 | UI/Terminal | look_at, interactive_bash | Visual analysis and tmux control |
 | Execution | slashcommand, skill, skill_mcp | Command and skill-based extensibility |
 
diff --git a/src/tools/call-omo-agent/tools.ts b/src/tools/call-omo-agent/tools.ts
index 2f06adf87..94c3d6bd6 100644
--- a/src/tools/call-omo-agent/tools.ts
+++ b/src/tools/call-omo-agent/tools.ts
@@ -190,7 +190,7 @@ async function executeSync(
         tools: {
           ...getAgentToolRestrictions(args.subagent_type),
           task: false,
-          sisyphus_task: false,
+          delegate_task: false,
         },
         parts: [{ type: "text", text: args.prompt }],
       },
diff --git a/src/tools/sisyphus-task/constants.ts b/src/tools/delegate-task/constants.ts
similarity index 99%
rename from src/tools/sisyphus-task/constants.ts
rename to src/tools/delegate-task/constants.ts
index f84e344a4..992d0bd46 100644
--- a/src/tools/sisyphus-task/constants.ts
+++ b/src/tools/delegate-task/constants.ts
@@ -236,7 +236,7 @@ export const CATEGORY_DESCRIPTIONS: Record<string, string> = {
 
 const BUILTIN_CATEGORIES = Object.keys(DEFAULT_CATEGORIES).join(", ")
 
-export const SISYPHUS_TASK_DESCRIPTION = `Spawn agent task with category-based or direct agent selection.
+export const DELEGATE_TASK_DESCRIPTION = `Spawn agent task with category-based or direct agent selection.
 
 MUTUALLY EXCLUSIVE: Provide EITHER category OR agent, not both (unless resuming).
 
diff --git a/src/tools/sisyphus-task/index.ts b/src/tools/delegate-task/index.ts
similarity index 51%
rename from src/tools/sisyphus-task/index.ts
rename to src/tools/delegate-task/index.ts
index bbbe3f58f..def55a80c 100644
--- a/src/tools/sisyphus-task/index.ts
+++ b/src/tools/delegate-task/index.ts
@@ -1,3 +1,3 @@
-export { createSisyphusTask, type SisyphusTaskToolOptions } from "./tools"
+export { createDelegateTask, type DelegateTaskToolOptions } from "./tools"
 export type * from "./types"
 export * from "./constants"
diff --git a/src/tools/sisyphus-task/tools.test.ts b/src/tools/delegate-task/tools.test.ts
similarity index 94%
rename from src/tools/sisyphus-task/tools.test.ts
rename to src/tools/delegate-task/tools.test.ts
index fd208d4a6..ff96f6aa7 100644
--- a/src/tools/sisyphus-task/tools.test.ts
+++ b/src/tools/delegate-task/tools.test.ts
@@ -1,5 +1,5 @@
 import { describe, test, expect } from "bun:test"
-import { DEFAULT_CATEGORIES, CATEGORY_PROMPT_APPENDS, CATEGORY_DESCRIPTIONS, SISYPHUS_TASK_DESCRIPTION } from "./constants"
+import { DEFAULT_CATEGORIES, CATEGORY_PROMPT_APPENDS, CATEGORY_DESCRIPTIONS, DELEGATE_TASK_DESCRIPTION } from "./constants"
 import type { CategoryConfig } from "../../config/schema"
 
 function resolveCategoryConfig(
@@ -101,16 +101,16 @@ describe("sisyphus-task", () => {
     })
   })
 
-  describe("SISYPHUS_TASK_DESCRIPTION", () => {
+  describe("DELEGATE_TASK_DESCRIPTION", () => {
     test("documents background parameter as required with default false", () => {
       // #given / #when / #then
-      expect(SISYPHUS_TASK_DESCRIPTION).toContain("background")
-      expect(SISYPHUS_TASK_DESCRIPTION).toContain("Default: false")
+      expect(DELEGATE_TASK_DESCRIPTION).toContain("background")
+      expect(DELEGATE_TASK_DESCRIPTION).toContain("Default: false")
     })
 
     test("warns about parallel exploration usage", () => {
       // #given / #when / #then
-      expect(SISYPHUS_TASK_DESCRIPTION).toContain("5+")
+      expect(DELEGATE_TASK_DESCRIPTION).toContain("5+")
     })
   })
 
@@ -257,7 +257,7 @@ describe("sisyphus-task", () => {
   describe("category variant", () => {
     test("passes variant to background model payload", async () => {
       // #given
-      const { createSisyphusTask } = require("./tools")
+      const { createDelegateTask } = require("./tools")
       let launchInput: any
 
       const mockManager = {
@@ -283,7 +283,7 @@ describe("sisyphus-task", () => {
         },
       }
 
-      const tool = createSisyphusTask({
+      const tool = createDelegateTask({
         manager: mockManager,
         client: mockClient,
         userCategories: {
@@ -320,17 +320,17 @@ describe("sisyphus-task", () => {
   })
 
   describe("skills parameter", () => {
-    test("SISYPHUS_TASK_DESCRIPTION documents skills parameter with null option", () => {
+    test("DELEGATE_TASK_DESCRIPTION documents skills parameter with null option", () => {
       // #given / #when / #then
-      expect(SISYPHUS_TASK_DESCRIPTION).toContain("skills")
-      expect(SISYPHUS_TASK_DESCRIPTION).toContain("Array of skill names")
-      expect(SISYPHUS_TASK_DESCRIPTION).toContain("Empty array [] is NOT allowed")
-      expect(SISYPHUS_TASK_DESCRIPTION).toContain("null if no skills needed")
+      expect(DELEGATE_TASK_DESCRIPTION).toContain("skills")
+      expect(DELEGATE_TASK_DESCRIPTION).toContain("Array of skill names")
+      expect(DELEGATE_TASK_DESCRIPTION).toContain("Empty array [] is NOT allowed")
+      expect(DELEGATE_TASK_DESCRIPTION).toContain("null if no skills needed")
     })
 
     test("skills parameter is required - returns error when not provided", async () => {
       // #given
-      const { createSisyphusTask } = require("./tools")
+      const { createDelegateTask } = require("./tools")
       
       const mockManager = { launch: async () => ({}) }
       const mockClient = {
@@ -343,7 +343,7 @@ describe("sisyphus-task", () => {
         },
       }
       
-      const tool = createSisyphusTask({
+      const tool = createDelegateTask({
         manager: mockManager,
         client: mockClient,
       })
@@ -373,7 +373,7 @@ describe("sisyphus-task", () => {
 
     test("empty array [] returns error with available skills list", async () => {
       // #given
-      const { createSisyphusTask } = require("./tools")
+      const { createDelegateTask } = require("./tools")
       
       const mockManager = { launch: async () => ({}) }
       const mockClient = {
@@ -386,7 +386,7 @@ describe("sisyphus-task", () => {
         },
       }
       
-      const tool = createSisyphusTask({
+      const tool = createDelegateTask({
         manager: mockManager,
         client: mockClient,
       })
@@ -419,7 +419,7 @@ describe("sisyphus-task", () => {
 
     test("null skills is allowed and proceeds without skill content", async () => {
       // #given
-      const { createSisyphusTask } = require("./tools")
+      const { createDelegateTask } = require("./tools")
       let promptBody: any
       
       const mockManager = { launch: async () => ({}) }
@@ -440,7 +440,7 @@ describe("sisyphus-task", () => {
         },
       }
       
-      const tool = createSisyphusTask({
+      const tool = createDelegateTask({
         manager: mockManager,
         client: mockClient,
       })
@@ -474,7 +474,7 @@ describe("sisyphus-task", () => {
   test("resume with background=false should wait for result and return content", async () => {
     // Note: This test needs extended timeout because the implementation has MIN_STABILITY_TIME_MS = 5000
     // #given
-    const { createSisyphusTask } = require("./tools")
+    const { createDelegateTask } = require("./tools")
     
     const mockTask = {
       id: "task-123",
@@ -507,7 +507,7 @@ describe("sisyphus-task", () => {
       },
     }
     
-    const tool = createSisyphusTask({
+    const tool = createDelegateTask({
       manager: mockManager,
       client: mockClient,
     })
@@ -538,7 +538,7 @@ describe("sisyphus-task", () => {
 
   test("resume with background=true should return immediately without waiting", async () => {
     // #given
-    const { createSisyphusTask } = require("./tools")
+    const { createDelegateTask } = require("./tools")
     
     const mockTask = {
       id: "task-456",
@@ -562,7 +562,7 @@ describe("sisyphus-task", () => {
       config: { get: async () => ({}) },
     }
     
-    const tool = createSisyphusTask({
+    const tool = createDelegateTask({
       manager: mockManager,
       client: mockClient,
     })
@@ -595,7 +595,7 @@ describe("sisyphus-task", () => {
   describe("sync mode new task (run_in_background=false)", () => {
     test("sync mode prompt error returns error message immediately", async () => {
       // #given
-      const { createSisyphusTask } = require("./tools")
+      const { createDelegateTask } = require("./tools")
       
       const mockManager = {
         launch: async () => ({}),
@@ -617,7 +617,7 @@ describe("sisyphus-task", () => {
         },
       }
       
-      const tool = createSisyphusTask({
+      const tool = createDelegateTask({
         manager: mockManager,
         client: mockClient,
       })
@@ -651,7 +651,7 @@ describe("sisyphus-task", () => {
 
     test("sync mode success returns task result with content", async () => {
       // #given
-      const { createSisyphusTask } = require("./tools")
+      const { createDelegateTask } = require("./tools")
       
       const mockManager = {
         launch: async () => ({}),
@@ -678,7 +678,7 @@ describe("sisyphus-task", () => {
         },
       }
       
-      const tool = createSisyphusTask({
+      const tool = createDelegateTask({
         manager: mockManager,
         client: mockClient,
       })
@@ -709,7 +709,7 @@ describe("sisyphus-task", () => {
 
     test("sync mode agent not found returns helpful error", async () => {
       // #given
-      const { createSisyphusTask } = require("./tools")
+      const { createDelegateTask } = require("./tools")
       
       const mockManager = {
         launch: async () => ({}),
@@ -731,7 +731,7 @@ describe("sisyphus-task", () => {
         },
       }
       
-      const tool = createSisyphusTask({
+      const tool = createDelegateTask({
         manager: mockManager,
         client: mockClient,
       })
@@ -763,7 +763,7 @@ describe("sisyphus-task", () => {
 
     test("sync mode passes category model to prompt", async () => {
       // #given
-      const { createSisyphusTask } = require("./tools")
+      const { createDelegateTask } = require("./tools")
       let promptBody: any
 
       const mockManager = { launch: async () => ({}) }
@@ -784,7 +784,7 @@ describe("sisyphus-task", () => {
         app: { agents: async () => ({ data: [] }) },
       }
 
-      const tool = createSisyphusTask({
+      const tool = createDelegateTask({
         manager: mockManager,
         client: mockClient,
         userCategories: {
diff --git a/src/tools/sisyphus-task/tools.ts b/src/tools/delegate-task/tools.ts
similarity index 97%
rename from src/tools/sisyphus-task/tools.ts
rename to src/tools/delegate-task/tools.ts
index 7f6697cf9..6a7f861b7 100644
--- a/src/tools/sisyphus-task/tools.ts
+++ b/src/tools/delegate-task/tools.ts
@@ -2,9 +2,9 @@ import { tool, type PluginInput, type ToolDefinition } from "@opencode-ai/plugin
 import { existsSync, readdirSync } from "node:fs"
 import { join } from "node:path"
 import type { BackgroundManager } from "../../features/background-agent"
-import type { SisyphusTaskArgs } from "./types"
+import type { DelegateTaskArgs } from "./types"
 import type { CategoryConfig, CategoriesConfig, GitMasterConfig } from "../../config/schema"
-import { SISYPHUS_TASK_DESCRIPTION, DEFAULT_CATEGORIES, CATEGORY_PROMPT_APPENDS } from "./constants"
+import { DELEGATE_TASK_DESCRIPTION, DEFAULT_CATEGORIES, CATEGORY_PROMPT_APPENDS } from "./constants"
 import { findNearestMessageWithFields, findFirstMessageWithAgent, MESSAGE_STORAGE } from "../../features/hook-message-injector"
 import { resolveMultipleSkillsAsync } from "../../features/opencode-skill-loader/skill-content"
 import { discoverSkills } from "../../features/opencode-skill-loader"
@@ -53,7 +53,7 @@ function formatDuration(start: Date, end?: Date): string {
 
 interface ErrorContext {
   operation: string
-  args?: SisyphusTaskArgs
+  args?: DelegateTaskArgs
   sessionID?: string
   agent?: string
   category?: string
@@ -143,7 +143,7 @@ function resolveCategoryConfig(
   return { config, promptAppend, model }
 }
 
-export interface SisyphusTaskToolOptions {
+export interface DelegateTaskToolOptions {
   manager: BackgroundManager
   client: OpencodeClient
   directory: string
@@ -170,11 +170,11 @@ export function buildSystemContent(input: BuildSystemContentInput): string | und
   return skillContent || categoryPromptAppend
 }
 
-export function createSisyphusTask(options: SisyphusTaskToolOptions): ToolDefinition {
+export function createDelegateTask(options: DelegateTaskToolOptions): ToolDefinition {
   const { manager, client, directory, userCategories, gitMasterConfig } = options
 
   return tool({
-    description: SISYPHUS_TASK_DESCRIPTION,
+    description: DELEGATE_TASK_DESCRIPTION,
     args: {
       description: tool.schema.string().describe("Short task description"),
       prompt: tool.schema.string().describe("Full detailed prompt for the agent"),
@@ -184,7 +184,7 @@ export function createSisyphusTask(options: SisyphusTaskToolOptions): ToolDefini
       resume: tool.schema.string().optional().describe("Session ID to resume - continues previous agent session with full context"),
       skills: tool.schema.array(tool.schema.string()).nullable().describe("Array of skill names to prepend to the prompt. Use null if no skills needed. Empty array [] is NOT allowed."),
     },
-    async execute(args: SisyphusTaskArgs, toolContext) {
+    async execute(args: DelegateTaskArgs, toolContext) {
       const ctx = toolContext as ToolContextWithMetadata
       if (args.run_in_background === undefined) {
         return `❌ Invalid arguments: 'run_in_background' parameter is REQUIRED. Use run_in_background=false for task delegation, run_in_background=true only for parallel exploration.`
@@ -223,7 +223,7 @@ If you believe no skills are needed, you MUST explicitly explain why to the user
       const sessionAgent = getSessionAgent(ctx.sessionID)
       const parentAgent = ctx.agent ?? sessionAgent ?? firstMessageAgent ?? prevMessage?.agent
       
-      log("[sisyphus_task] parentAgent resolution", {
+      log("[delegate_task] parentAgent resolution", {
         sessionID: ctx.sessionID,
         messageDir,
         ctxAgent: ctx.agent,
@@ -324,7 +324,7 @@ Use \`background_output\` with task_id="${task.id}" to check progress.`
               tools: {
                 ...(resumeAgent ? getAgentToolRestrictions(resumeAgent) : {}),
                 task: false,
-                sisyphus_task: false,
+                delegate_task: false,
                 call_omo_agent: true,
               },
               parts: [{ type: "text", text: args.prompt }],
@@ -502,7 +502,7 @@ ${textContent || "(No text output)"}`
           if (!callableNames.includes(agentToUse)) {
             const isPrimaryAgent = agents.some((a) => a.name === agentToUse && a.mode === "primary")
             if (isPrimaryAgent) {
-              return `❌ Cannot call primary agent "${agentToUse}" via sisyphus_task. Primary agents are top-level orchestrators.`
+              return `❌ Cannot call primary agent "${agentToUse}" via delegate_task. Primary agents are top-level orchestrators.`
             }
 
             const availableAgents = callableNames
@@ -610,7 +610,7 @@ System notifies on completion. Use \`background_output\` with task_id="${task.id
               system: systemContent,
               tools: {
                 task: false,
-                sisyphus_task: false,
+                delegate_task: false,
                 call_omo_agent: true,
               },
               parts: [{ type: "text", text: args.prompt }],
@@ -651,11 +651,11 @@ System notifies on completion. Use \`background_output\` with task_id="${task.id
         let stablePolls = 0
         let pollCount = 0
 
-        log("[sisyphus_task] Starting poll loop", { sessionID, agentToUse })
+        log("[delegate_task] Starting poll loop", { sessionID, agentToUse })
 
         while (Date.now() - pollStart < MAX_POLL_TIME_MS) {
           if (ctx.abort?.aborted) {
-            log("[sisyphus_task] Aborted by user", { sessionID })
+            log("[delegate_task] Aborted by user", { sessionID })
             if (toastManager && taskId) toastManager.removeTask(taskId)
             return `Task aborted.\n\nSession ID: ${sessionID}`
           }
@@ -668,7 +668,7 @@ System notifies on completion. Use \`background_output\` with task_id="${task.id
           const sessionStatus = allStatuses[sessionID]
 
           if (pollCount % 10 === 0) {
-            log("[sisyphus_task] Poll status", {
+            log("[delegate_task] Poll status", {
               sessionID,
               pollCount,
               elapsed: Math.floor((Date.now() - pollStart) / 1000) + "s",
@@ -696,7 +696,7 @@ System notifies on completion. Use \`background_output\` with task_id="${task.id
           if (currentMsgCount === lastMsgCount) {
             stablePolls++
             if (stablePolls >= STABILITY_POLLS_REQUIRED) {
-              log("[sisyphus_task] Poll complete - messages stable", { sessionID, pollCount, currentMsgCount })
+              log("[delegate_task] Poll complete - messages stable", { sessionID, pollCount, currentMsgCount })
               break
             }
           } else {
@@ -706,7 +706,7 @@ System notifies on completion. Use \`background_output\` with task_id="${task.id
         }
 
         if (Date.now() - pollStart >= MAX_POLL_TIME_MS) {
-          log("[sisyphus_task] Poll timeout reached", { sessionID, pollCount, lastMsgCount, stablePolls })
+          log("[delegate_task] Poll timeout reached", { sessionID, pollCount, lastMsgCount, stablePolls })
         }
 
         const messagesResult = await client.session.messages({
diff --git a/src/tools/sisyphus-task/types.ts b/src/tools/delegate-task/types.ts
similarity index 81%
rename from src/tools/sisyphus-task/types.ts
rename to src/tools/delegate-task/types.ts
index 90ba24851..c34be0897 100644
--- a/src/tools/sisyphus-task/types.ts
+++ b/src/tools/delegate-task/types.ts
@@ -1,4 +1,4 @@
-export interface SisyphusTaskArgs {
+export interface DelegateTaskArgs {
   description: string
   prompt: string
   category?: string
diff --git a/src/tools/index.ts b/src/tools/index.ts
index aac291f19..23b8f5b58 100644
--- a/src/tools/index.ts
+++ b/src/tools/index.ts
@@ -45,7 +45,7 @@ type OpencodeClient = PluginInput["client"]
 
 export { createCallOmoAgent } from "./call-omo-agent"
 export { createLookAt } from "./look-at"
-export { createSisyphusTask, type SisyphusTaskToolOptions, DEFAULT_CATEGORIES, CATEGORY_PROMPT_APPENDS } from "./sisyphus-task"
+export { createDelegateTask, type DelegateTaskToolOptions, DEFAULT_CATEGORIES, CATEGORY_PROMPT_APPENDS } from "./delegate-task"
 
 export function createBackgroundTools(manager: BackgroundManager, client: OpencodeClient): Record<string, ToolDefinition> {
   return {