diff --git a/src/hooks/agent-usage-reminder/hook.ts b/src/hooks/agent-usage-reminder/hook.ts
index ef2a7b3d9..49e32ce13 100644
--- a/src/hooks/agent-usage-reminder/hook.ts
+++ b/src/hooks/agent-usage-reminder/hook.ts
@@ -6,8 +6,7 @@ import {
 } from "./storage";
 import { TARGET_TOOLS, AGENT_TOOLS, REMINDER_MESSAGE } from "./constants";
 import type { AgentUsageState } from "./types";
-import { getSessionAgent } from "../../features/claude-code-session-state";
-import { getAgentConfigKey } from "../../shared/agent-display-names";
+import { isOrchestratorAgent } from "../../shared/orchestrator-agents";
 
 interface ToolExecuteInput {
   tool: string;
@@ -28,23 +27,6 @@ interface EventInput {
   };
 }
 
-/**
- * Only orchestrator agents should receive usage reminders.
- * Subagents (explore, librarian, oracle, etc.) are the targets of delegation,
- * so reminding them to delegate to themselves is counterproductive.
- */
-const ORCHESTRATOR_AGENTS = new Set([
-  "sisyphus",
-  "sisyphus-junior",
-  "atlas",
-  "hephaestus",
-  "prometheus",
-]);
-
-function isOrchestratorAgent(agentName: string): boolean {
-  return ORCHESTRATOR_AGENTS.has(getAgentConfigKey(agentName));
-}
-
 export function createAgentUsageReminderHook(_ctx: PluginInput) {
   const sessionStates = new Map<string, AgentUsageState>();
 
@@ -80,8 +62,7 @@ export function createAgentUsageReminderHook(_ctx: PluginInput) {
   ) => {
     const { tool, sessionID } = input;
 
-    const agent = getSessionAgent(sessionID);
-    if (agent && !isOrchestratorAgent(agent)) {
+    if (!isOrchestratorAgent(sessionID)) {
       return;
     }
 
diff --git a/src/hooks/category-skill-reminder/hook.ts b/src/hooks/category-skill-reminder/hook.ts
index a89d182b0..9e75b3417 100644
--- a/src/hooks/category-skill-reminder/hook.ts
+++ b/src/hooks/category-skill-reminder/hook.ts
@@ -1,20 +1,9 @@
 import type { PluginInput } from "@opencode-ai/plugin"
 import type { AvailableSkill } from "../../agents/dynamic-agent-prompt-builder"
-import { getSessionAgent } from "../../features/claude-code-session-state"
 import { log } from "../../shared"
-import { getAgentConfigKey } from "../../shared/agent-display-names"
+import { isOrchestratorAgent } from "../../shared/orchestrator-agents"
 import { buildReminderMessage } from "./formatter"
 
-/**
- * Target agents that should receive category+skill reminders.
- * These are orchestrator agents that delegate work to specialized agents.
- */
-const TARGET_AGENTS = new Set([
-  "sisyphus",
-  "sisyphus-junior",
-  "atlas",
-])
-
 /**
  * Tools that indicate the agent is doing work that could potentially be delegated.
  * When these tools are used, we remind the agent about the category+skill system.
@@ -73,22 +62,11 @@ export function createCategorySkillReminderHook(
     return sessionStates.get(sessionID)!
   }
 
-  function isTargetAgent(sessionID: string, inputAgent?: string): boolean {
-    const agent = getSessionAgent(sessionID) ?? inputAgent
-    if (!agent) return false
-    const agentKey = getAgentConfigKey(agent)
-    return (
-      TARGET_AGENTS.has(agentKey) ||
-      agentKey.includes("sisyphus") ||
-      agentKey.includes("atlas")
-    )
-  }
-
   const toolExecuteAfter = async (input: ToolExecuteInput, output: ToolExecuteOutput) => {
     const { tool, sessionID } = input
     const toolLower = tool.toLowerCase()
 
-    if (!isTargetAgent(sessionID, input.agent)) {
+    if (!isOrchestratorAgent(sessionID, input.agent)) {
       return
     }
 
diff --git a/src/shared/index.ts b/src/shared/index.ts
index 09187602f..d3bc0605f 100644
--- a/src/shared/index.ts
+++ b/src/shared/index.ts
@@ -32,6 +32,7 @@ export * from "./session-cursor"
 export * from "./shell-env"
 export * from "./system-directive"
 export * from "./agent-tool-restrictions"
+export * from "./orchestrator-agents"
 export * from "./model-requirements"
 export * from "./model-resolver"
 export { normalizeFallbackModels } from "./model-resolver"
diff --git a/src/shared/orchestrator-agents.ts b/src/shared/orchestrator-agents.ts
new file mode 100644
index 000000000..ba8f2952d
--- /dev/null
+++ b/src/shared/orchestrator-agents.ts
@@ -0,0 +1,21 @@
+import { getSessionAgent } from "../features/claude-code-session-state"
+import { getAgentConfigKey } from "./agent-display-names"
+
+export const ORCHESTRATOR_AGENTS = new Set([
+  "sisyphus",
+  "sisyphus-junior",
+  "atlas",
+  "hephaestus",
+  "prometheus",
+])
+
+export function isOrchestratorAgent(sessionID: string, inputAgent?: string): boolean {
+  const agent = getSessionAgent(sessionID) ?? inputAgent
+  if (!agent) return true
+  const agentKey = getAgentConfigKey(agent)
+  return (
+    ORCHESTRATOR_AGENTS.has(agentKey) ||
+    agentKey.includes("sisyphus") ||
+    agentKey.includes("atlas")
+  )
+}