release: v3.1.8

- Fix sessionTag showing '[undefine]' when sessionID is undefined
  - System events now display as '[system]' instead
- Fix message.updated expecting non-existent 'content' field
  - SDK's EventMessageUpdated only contains info metadata, not content
  - Content is streamed via message.part.updated events
- Add text preview to message.part.updated verbose logging
- Update MessageUpdatedProps type to match SDK structure
- Update tests to reflect actual SDK behavior

package.json

@@ -1,6 +1,6 @@
 {
   "name": "oh-my-opencode",
-  "version": "3.1.7",
+  "version": "3.1.8",
   "description": "The Best AI Agent Harness - Batteries-Included OpenCode Plugin with Multi-Model Orchestration, Parallel Background Agents, and Crafted LSP/AST Tools",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
@@ -74,13 +74,13 @@
     "typescript": "^5.7.3"
   },
   "optionalDependencies": {
-    "oh-my-opencode-darwin-arm64": "3.1.7",
-    "oh-my-opencode-darwin-x64": "3.1.7",
-    "oh-my-opencode-linux-arm64": "3.1.7",
-    "oh-my-opencode-linux-arm64-musl": "3.1.7",
-    "oh-my-opencode-linux-x64": "3.1.7",
-    "oh-my-opencode-linux-x64-musl": "3.1.7",
-    "oh-my-opencode-windows-x64": "3.1.7"
+    "oh-my-opencode-darwin-arm64": "3.1.8",
+    "oh-my-opencode-darwin-x64": "3.1.8",
+    "oh-my-opencode-linux-arm64": "3.1.8",
+    "oh-my-opencode-linux-arm64-musl": "3.1.8",
+    "oh-my-opencode-linux-x64": "3.1.8",
+    "oh-my-opencode-linux-x64-musl": "3.1.8",
+    "oh-my-opencode-windows-x64": "3.1.8"
   },
   "trustedDependencies": [
     "@ast-grep/cli",

packages/darwin-arm64/package.json

@@ -1,6 +1,6 @@
 {
   "name": "oh-my-opencode-darwin-arm64",
-  "version": "3.1.7",
+  "version": "3.1.8",
   "description": "Platform-specific binary for oh-my-opencode (darwin-arm64)",
   "license": "MIT",
   "repository": {

packages/darwin-x64/package.json

@@ -1,6 +1,6 @@
 {
   "name": "oh-my-opencode-darwin-x64",
-  "version": "3.1.7",
+  "version": "3.1.8",
   "description": "Platform-specific binary for oh-my-opencode (darwin-x64)",
   "license": "MIT",
   "repository": {

packages/linux-arm64-musl/package.json

@@ -1,6 +1,6 @@
 {
   "name": "oh-my-opencode-linux-arm64-musl",
-  "version": "3.1.7",
+  "version": "3.1.8",
   "description": "Platform-specific binary for oh-my-opencode (linux-arm64-musl)",
   "license": "MIT",
   "repository": {

packages/linux-arm64/package.json

@@ -1,6 +1,6 @@
 {
   "name": "oh-my-opencode-linux-arm64",
-  "version": "3.1.7",
+  "version": "3.1.8",
   "description": "Platform-specific binary for oh-my-opencode (linux-arm64)",
   "license": "MIT",
   "repository": {

packages/linux-x64-musl/package.json

@@ -1,6 +1,6 @@
 {
   "name": "oh-my-opencode-linux-x64-musl",
-  "version": "3.1.7",
+  "version": "3.1.8",
   "description": "Platform-specific binary for oh-my-opencode (linux-x64-musl)",
   "license": "MIT",
   "repository": {

packages/linux-x64/package.json

@@ -1,6 +1,6 @@
 {
   "name": "oh-my-opencode-linux-x64",
-  "version": "3.1.7",
+  "version": "3.1.8",
   "description": "Platform-specific binary for oh-my-opencode (linux-x64)",
   "license": "MIT",
   "repository": {

packages/windows-x64/package.json

@@ -1,6 +1,6 @@
 {
   "name": "oh-my-opencode-windows-x64",
-  "version": "3.1.7",
+  "version": "3.1.8",
   "description": "Platform-specific binary for oh-my-opencode (windows-x64)",
   "license": "MIT",
   "repository": {

signatures/cla.json

@@ -967,6 +967,14 @@
       "created_at": "2026-01-29T09:00:28Z",
       "repoId": 1108837393,
       "pullRequestNo": 1241
+    },
+    {
+      "name": "LeekJay",
+      "id": 39609783,
+      "comment_id": 3819009761,
+      "created_at": "2026-01-29T17:03:24Z",
+      "repoId": 1108837393,
+      "pullRequestNo": 1254
     }
   ]
 }

src/cli/run/events.test.ts

@@ -82,6 +82,7 @@ describe("createEventState", () => {
     expect(state.lastOutput).toBe("")
     expect(state.lastPartText).toBe("")
     expect(state.currentTool).toBe(null)
+    expect(state.hasReceivedMeaningfulWork).toBe(false)
   })
 })
 
@@ -126,6 +127,119 @@ describe("event handling", () => {
     expect(state.mainSessionIdle).toBe(false)
   })
 
+  it("hasReceivedMeaningfulWork is false initially after session.idle", async () => {
+    // #given - session goes idle without any assistant output (race condition scenario)
+    const ctx = createMockContext("my-session")
+    const state = createEventState()
+
+    const payload: EventPayload = {
+      type: "session.idle",
+      properties: { sessionID: "my-session" },
+    }
+
+    const events = toAsyncIterable([payload])
+    const { processEvents } = await import("./events")
+
+    // #when
+    await processEvents(ctx, events, state)
+
+    // #then - idle but no meaningful work yet
+    expect(state.mainSessionIdle).toBe(true)
+    expect(state.hasReceivedMeaningfulWork).toBe(false)
+  })
+
+  it("message.updated with assistant role sets hasReceivedMeaningfulWork", async () => {
+    // #given
+    const ctx = createMockContext("my-session")
+    const state = createEventState()
+
+    const payload: EventPayload = {
+      type: "message.updated",
+      properties: {
+        info: { sessionID: "my-session", role: "assistant" },
+      },
+    }
+
+    const events = toAsyncIterable([payload])
+    const { processEvents } = await import("./events")
+
+    // #when
+    await processEvents(ctx, events, state)
+
+    // #then
+    expect(state.hasReceivedMeaningfulWork).toBe(true)
+  })
+
+  it("message.updated with user role does not set hasReceivedMeaningfulWork", async () => {
+    // #given - user message should not count as meaningful work
+    const ctx = createMockContext("my-session")
+    const state = createEventState()
+
+    const payload: EventPayload = {
+      type: "message.updated",
+      properties: {
+        info: { sessionID: "my-session", role: "user" },
+      },
+    }
+
+    const events = toAsyncIterable([payload])
+    const { processEvents } = await import("./events")
+
+    // #when
+    await processEvents(ctx, events, state)
+
+    // #then - user role should not count as meaningful work
+    expect(state.hasReceivedMeaningfulWork).toBe(false)
+  })
+
+  it("tool.execute sets hasReceivedMeaningfulWork", async () => {
+    // #given
+    const ctx = createMockContext("my-session")
+    const state = createEventState()
+
+    const payload: EventPayload = {
+      type: "tool.execute",
+      properties: {
+        sessionID: "my-session",
+        name: "read_file",
+        input: { filePath: "/src/index.ts" },
+      },
+    }
+
+    const events = toAsyncIterable([payload])
+    const { processEvents } = await import("./events")
+
+    // #when
+    await processEvents(ctx, events, state)
+
+    // #then
+    expect(state.hasReceivedMeaningfulWork).toBe(true)
+  })
+
+  it("tool.execute from different session does not set hasReceivedMeaningfulWork", async () => {
+    // #given
+    const ctx = createMockContext("my-session")
+    const state = createEventState()
+
+    const payload: EventPayload = {
+      type: "tool.execute",
+      properties: {
+        sessionID: "other-session",
+        name: "read_file",
+        input: { filePath: "/src/index.ts" },
+      },
+    }
+
+    const events = toAsyncIterable([payload])
+    const { processEvents } = await import("./events")
+
+    // #when
+    await processEvents(ctx, events, state)
+
+    // #then - different session's tool call shouldn't count
+    expect(state.hasReceivedMeaningfulWork).toBe(false)
+  })
+
   it("session.status with busy type sets mainSessionIdle to false", async () => {
     // #given
     const ctx = createMockContext("my-session")
@@ -136,6 +250,7 @@ describe("event handling", () => {
       lastOutput: "",
       lastPartText: "",
       currentTool: null,
+      hasReceivedMeaningfulWork: false,
     }
 
     const payload: EventPayload = {

src/cli/run/events.ts

@@ -63,6 +63,8 @@ export interface EventState {
   lastOutput: string
   lastPartText: string
   currentTool: string | null
+  /** Set to true when the main session has produced meaningful work (text, tool call, or tool result) */
+  hasReceivedMeaningfulWork: boolean
 }
 
 export function createEventState(): EventState {
@@ -73,6 +75,7 @@ export function createEventState(): EventState {
     lastOutput: "",
     lastPartText: "",
     currentTool: null,
+    hasReceivedMeaningfulWork: false,
   }
 }
 
@@ -113,7 +116,9 @@ function logEventVerbose(ctx: RunContext, payload: EventPayload): void {
   const isMainSession = sessionID === ctx.sessionID
   const sessionTag = isMainSession
     ? pc.green("[MAIN]")
-    : pc.yellow(`[${String(sessionID).slice(0, 8)}]`)
+    : sessionID
+      ? pc.yellow(`[${String(sessionID).slice(0, 8)}]`)
+      : pc.dim("[system]")
 
   switch (payload.type) {
     case "session.idle":
@@ -124,8 +129,6 @@ function logEventVerbose(ctx: RunContext, payload: EventPayload): void {
     }
 
     case "message.part.updated": {
-      // Skip verbose logging for partial message updates
-      // Only log tool invocation state changes, not text streaming
       const partProps = props as MessagePartUpdatedProps | undefined
       const part = partProps?.part
       if (part?.type === "tool-invocation") {
@@ -133,6 +136,11 @@ function logEventVerbose(ctx: RunContext, payload: EventPayload): void {
         console.error(
           pc.dim(`${sessionTag} message.part (tool): ${toolPart.toolName} [${toolPart.state}]`)
         )
+      } else if (part?.type === "text" && part.text) {
+        const preview = part.text.slice(0, 80).replace(/\n/g, "\\n")
+        console.error(
+          pc.dim(`${sessionTag} message.part (text): "${preview}${part.text.length > 80 ? "..." : ""}"`)
+        )
       }
       break
     }
@@ -140,11 +148,10 @@ function logEventVerbose(ctx: RunContext, payload: EventPayload): void {
     case "message.updated": {
       const msgProps = props as MessageUpdatedProps | undefined
       const role = msgProps?.info?.role ?? "unknown"
-      const content = msgProps?.content ?? ""
-      const preview = content.slice(0, 100).replace(/\n/g, "\\n")
-      console.error(
-        pc.dim(`${sessionTag} message.updated (${role}): "${preview}${content.length > 100 ? "..." : ""}"`)
-      )
+      const model = msgProps?.info?.modelID
+      const agent = msgProps?.info?.agent
+      const details = [role, agent, model].filter(Boolean).join(", ")
+      console.error(pc.dim(`${sessionTag} message.updated (${details})`))
       break
     }
 
@@ -241,6 +248,7 @@ function handleMessagePartUpdated(
     const newText = part.text.slice(state.lastPartText.length)
     if (newText) {
       process.stdout.write(newText)
+      state.hasReceivedMeaningfulWork = true
     }
     state.lastPartText = part.text
   }
@@ -257,16 +265,7 @@ function handleMessageUpdated(
   if (props?.info?.sessionID !== ctx.sessionID) return
   if (props?.info?.role !== "assistant") return
 
-  const content = props.content
-  if (!content || content === state.lastOutput) return
-
-  if (state.lastPartText.length === 0) {
-    const newContent = content.slice(state.lastOutput.length)
-    if (newContent) {
-      process.stdout.write(newContent)
-    }
-  }
-  state.lastOutput = content
+  state.hasReceivedMeaningfulWork = true
 }
 
 function handleToolExecute(
@@ -296,6 +295,7 @@ function handleToolExecute(
     }
   }
 
+  state.hasReceivedMeaningfulWork = true
   process.stdout.write(`\n${pc.cyan(">")} ${pc.bold(toolName)}${inputPreview}\n`)
 }
 

src/cli/run/runner.ts

@@ -143,6 +143,14 @@ export async function run(options: RunOptions): Promise<number> {
           process.exit(1)
         }
 
+        // Guard against premature completion: don't check completion until the
+        // session has produced meaningful work (text output, tool call, or tool result).
+        // Without this, a session that goes busy->idle before the LLM responds
+        // would exit immediately because 0 todos + 0 children = "complete".
+        if (!eventState.hasReceivedMeaningfulWork) {
+          continue
+        }
+
         const shouldExit = await checkCompletionConditions(ctx)
         if (shouldExit) {
           console.log(pc.green("\n\nAll tasks completed."))

src/cli/run/types.ts

@@ -44,8 +44,13 @@ export interface SessionStatusProps {
 }
 
 export interface MessageUpdatedProps {
-  info?: { sessionID?: string; role?: string }
-  content?: string
+  info?: {
+    sessionID?: string
+    role?: string
+    modelID?: string
+    providerID?: string
+    agent?: string
+  }
 }
 
 export interface MessagePartUpdatedProps {

src/features/tmux-subagent/manager.test.ts

@@ -2,6 +2,7 @@ import { describe, test, expect, mock, beforeEach } from 'bun:test'
 import type { TmuxConfig } from '../../config/schema'
 import type { WindowState, PaneAction } from './types'
 import type { ActionResult, ExecuteContext } from './action-executor'
+import type { TmuxUtilDeps } from './manager'
 
 type ExecuteActionsResult = {
   success: boolean
@@ -33,6 +34,11 @@ const mockExecuteAction = mock<(
 const mockIsInsideTmux = mock<() => boolean>(() => true)
 const mockGetCurrentPaneId = mock<() => string | undefined>(() => '%0')
 
+const mockTmuxDeps: TmuxUtilDeps = {
+  isInsideTmux: mockIsInsideTmux,
+  getCurrentPaneId: mockGetCurrentPaneId,
+}
+
 mock.module('./pane-state-querier', () => ({
   queryWindowState: mockQueryWindowState,
   paneExists: mockPaneExists,
@@ -51,15 +57,19 @@ mock.module('./action-executor', () => ({
   executeAction: mockExecuteAction,
 }))
 
-mock.module('../../shared/tmux', () => ({
-  isInsideTmux: mockIsInsideTmux,
-  getCurrentPaneId: mockGetCurrentPaneId,
-  POLL_INTERVAL_BACKGROUND_MS: 2000,
-  SESSION_TIMEOUT_MS: 600000,
-  SESSION_MISSING_GRACE_MS: 6000,
-  SESSION_READY_POLL_INTERVAL_MS: 100,
-  SESSION_READY_TIMEOUT_MS: 500,
-}))
+mock.module('../../shared/tmux', () => {
+  const { isInsideTmux, getCurrentPaneId } = require('../../shared/tmux/tmux-utils')
+  const { POLL_INTERVAL_BACKGROUND_MS, SESSION_TIMEOUT_MS, SESSION_MISSING_GRACE_MS } = require('../../shared/tmux/constants')
+  return {
+    isInsideTmux,
+    getCurrentPaneId,
+    POLL_INTERVAL_BACKGROUND_MS,
+    SESSION_TIMEOUT_MS,
+    SESSION_MISSING_GRACE_MS,
+    SESSION_READY_POLL_INTERVAL_MS: 100,
+    SESSION_READY_TIMEOUT_MS: 500,
+  }
+})
 
 const trackedSessions = new Set<string>()
 
@@ -148,7 +158,7 @@ describe('TmuxSessionManager', () => {
       }
 
       //#when
-      const manager = new TmuxSessionManager(ctx, config)
+      const manager = new TmuxSessionManager(ctx, config, mockTmuxDeps)
 
       //#then
       expect(manager).toBeDefined()
@@ -168,7 +178,7 @@ describe('TmuxSessionManager', () => {
       }
 
       //#when
-      const manager = new TmuxSessionManager(ctx, config)
+      const manager = new TmuxSessionManager(ctx, config, mockTmuxDeps)
 
       //#then
       expect(manager).toBeDefined()
@@ -188,7 +198,7 @@ describe('TmuxSessionManager', () => {
       }
 
       //#when
-      const manager = new TmuxSessionManager(ctx, config)
+      const manager = new TmuxSessionManager(ctx, config, mockTmuxDeps)
 
       //#then
       expect(manager).toBeDefined()
@@ -210,7 +220,7 @@ describe('TmuxSessionManager', () => {
         main_pane_min_width: 80,
         agent_pane_min_width: 40,
       }
-      const manager = new TmuxSessionManager(ctx, config)
+      const manager = new TmuxSessionManager(ctx, config, mockTmuxDeps)
       const event = createSessionCreatedEvent(
         'ses_child',
         'ses_parent',
@@ -271,7 +281,7 @@ describe('TmuxSessionManager', () => {
         main_pane_min_width: 80,
         agent_pane_min_width: 40,
       }
-      const manager = new TmuxSessionManager(ctx, config)
+      const manager = new TmuxSessionManager(ctx, config, mockTmuxDeps)
 
       //#when - first agent
       await manager.onSessionCreated(
@@ -305,7 +315,7 @@ describe('TmuxSessionManager', () => {
         main_pane_min_width: 80,
         agent_pane_min_width: 40,
       }
-      const manager = new TmuxSessionManager(ctx, config)
+      const manager = new TmuxSessionManager(ctx, config, mockTmuxDeps)
       const event = createSessionCreatedEvent('ses_root', undefined, 'Root Session')
 
       //#when
@@ -327,7 +337,7 @@ describe('TmuxSessionManager', () => {
         main_pane_min_width: 80,
         agent_pane_min_width: 40,
       }
-      const manager = new TmuxSessionManager(ctx, config)
+      const manager = new TmuxSessionManager(ctx, config, mockTmuxDeps)
       const event = createSessionCreatedEvent(
         'ses_child',
         'ses_parent',
@@ -353,7 +363,7 @@ describe('TmuxSessionManager', () => {
         main_pane_min_width: 80,
         agent_pane_min_width: 40,
       }
-      const manager = new TmuxSessionManager(ctx, config)
+      const manager = new TmuxSessionManager(ctx, config, mockTmuxDeps)
       const event = {
         type: 'session.deleted',
         properties: {
@@ -398,7 +408,7 @@ describe('TmuxSessionManager', () => {
         main_pane_min_width: 120,
         agent_pane_min_width: 40,
       }
-      const manager = new TmuxSessionManager(ctx, config)
+      const manager = new TmuxSessionManager(ctx, config, mockTmuxDeps)
 
       //#when
       await manager.onSessionCreated(
@@ -450,7 +460,7 @@ describe('TmuxSessionManager', () => {
         main_pane_min_width: 80,
         agent_pane_min_width: 40,
       }
-      const manager = new TmuxSessionManager(ctx, config)
+      const manager = new TmuxSessionManager(ctx, config, mockTmuxDeps)
 
       await manager.onSessionCreated(
         createSessionCreatedEvent(
@@ -487,7 +497,7 @@ describe('TmuxSessionManager', () => {
         main_pane_min_width: 80,
         agent_pane_min_width: 40,
       }
-      const manager = new TmuxSessionManager(ctx, config)
+      const manager = new TmuxSessionManager(ctx, config, mockTmuxDeps)
 
       //#when
       await manager.onSessionDeleted({ sessionID: 'ses_unknown' })
@@ -521,7 +531,7 @@ describe('TmuxSessionManager', () => {
         main_pane_min_width: 80,
         agent_pane_min_width: 40,
       }
-      const manager = new TmuxSessionManager(ctx, config)
+      const manager = new TmuxSessionManager(ctx, config, mockTmuxDeps)
 
       await manager.onSessionCreated(
         createSessionCreatedEvent('ses_1', 'ses_parent', 'Task 1')

src/features/tmux-subagent/manager.ts

@@ -2,8 +2,8 @@ import type { PluginInput } from "@opencode-ai/plugin"
 import type { TmuxConfig } from "../../config/schema"
 import type { TrackedSession, CapacityConfig } from "./types"
 import {
-  isInsideTmux,
-  getCurrentPaneId,
+  isInsideTmux as defaultIsInsideTmux,
+  getCurrentPaneId as defaultGetCurrentPaneId,
   POLL_INTERVAL_BACKGROUND_MS,
   SESSION_MISSING_GRACE_MS,
   SESSION_READY_POLL_INTERVAL_MS,
@@ -21,6 +21,16 @@ interface SessionCreatedEvent {
   properties?: { info?: { id?: string; parentID?: string; title?: string } }
 }
 
+export interface TmuxUtilDeps {
+  isInsideTmux: () => boolean
+  getCurrentPaneId: () => string | undefined
+}
+
+const defaultTmuxDeps: TmuxUtilDeps = {
+  isInsideTmux: defaultIsInsideTmux,
+  getCurrentPaneId: defaultGetCurrentPaneId,
+}
+
 const SESSION_TIMEOUT_MS = 10 * 60 * 1000
 
 /**
@@ -43,13 +53,15 @@ export class TmuxSessionManager {
   private sessions = new Map<string, TrackedSession>()
   private pendingSessions = new Set<string>()
   private pollInterval?: ReturnType<typeof setInterval>
+  private deps: TmuxUtilDeps
 
-  constructor(ctx: PluginInput, tmuxConfig: TmuxConfig) {
+  constructor(ctx: PluginInput, tmuxConfig: TmuxConfig, deps: TmuxUtilDeps = defaultTmuxDeps) {
     this.client = ctx.client
     this.tmuxConfig = tmuxConfig
+    this.deps = deps
     const defaultPort = process.env.OPENCODE_PORT ?? "4096"
     this.serverUrl = ctx.serverUrl?.toString() ?? `http://localhost:${defaultPort}`
-    this.sourcePaneId = getCurrentPaneId()
+    this.sourcePaneId = deps.getCurrentPaneId()
 
     log("[tmux-session-manager] initialized", {
       configEnabled: this.tmuxConfig.enabled,
@@ -60,7 +72,7 @@ export class TmuxSessionManager {
   }
 
   private isEnabled(): boolean {
-    return this.tmuxConfig.enabled && isInsideTmux()
+    return this.tmuxConfig.enabled && this.deps.isInsideTmux()
   }
 
   private getCapacityConfig(): CapacityConfig {
@@ -113,7 +125,7 @@ export class TmuxSessionManager {
     log("[tmux-session-manager] onSessionCreated called", {
       enabled,
       tmuxConfigEnabled: this.tmuxConfig.enabled,
-      isInsideTmux: isInsideTmux(),
+      isInsideTmux: this.deps.isInsideTmux(),
       eventType: event.type,
       infoId: event.properties?.info?.id,
       infoParentID: event.properties?.info?.parentID,

src/tools/delegate-task/tools.test.ts

@@ -1474,6 +1474,73 @@ describe("sisyphus-task", () => {
     }, { timeout: 20000 })
   })
 
+  describe("category model resolution fallback", () => {
+    test("category uses resolved.model when connectedProvidersCache is null and availableModels is empty", async () => {
+      // #given - connectedProvidersCache returns null (simulates missing cache file)
+      // This is a regression test for PR #1227 which removed resolved.model from userModel chain
+      cacheSpy.mockReturnValue(null)
+
+      const { createDelegateTask } = require("./tools")
+      let launchInput: any
+
+      const mockManager = {
+        launch: async (input: any) => {
+          launchInput = input
+          return {
+            id: "task-fallback",
+            sessionID: "ses_fallback_test",
+            description: "Fallback test task",
+            agent: "sisyphus-junior",
+            status: "running",
+          }
+        },
+      }
+
+      const mockClient = {
+        app: { agents: async () => ({ data: [] }) },
+        config: { get: async () => ({ data: { model: SYSTEM_DEFAULT_MODEL } }) },
+        model: { list: async () => [] },
+        session: {
+          create: async () => ({ data: { id: "test-session" } }),
+          prompt: async () => ({ data: {} }),
+          messages: async () => ({ data: [] }),
+        },
+      }
+
+      // NO userCategories override, NO sisyphusJuniorModel
+      const tool = createDelegateTask({
+        manager: mockManager,
+        client: mockClient,
+        // userCategories: undefined - use DEFAULT_CATEGORIES only
+        // sisyphusJuniorModel: undefined
+      })
+
+      const toolContext = {
+        sessionID: "parent-session",
+        messageID: "parent-message",
+        agent: "sisyphus",
+        abort: new AbortController().signal,
+      }
+
+      // #when - using "quick" category which should use "anthropic/claude-haiku-4-5"
+      await tool.execute(
+        {
+          description: "Test category fallback",
+          prompt: "Do something quick",
+          category: "quick",
+          run_in_background: true,
+          load_skills: [],
+        },
+        toolContext
+      )
+
+      // #then - model should be anthropic/claude-haiku-4-5 from DEFAULT_CATEGORIES
+      //         NOT anthropic/claude-sonnet-4-5 (system default)
+      expect(launchInput.model.providerID).toBe("anthropic")
+      expect(launchInput.model.modelID).toBe("claude-haiku-4-5")
+    })
+  })
+
   describe("browserProvider propagation", () => {
     test("should resolve agent-browser skill when browserProvider is passed", async () => {
       // #given - delegate_task configured with browserProvider: "agent-browser"

src/tools/delegate-task/tools.ts

@@ -541,7 +541,7 @@ To continue this session: session_id="${args.session_id}"`
            }
           } else {
           const resolution = resolveModelWithFallback({
-              userModel: userCategories?.[args.category]?.model ?? sisyphusJuniorModel,
+              userModel: userCategories?.[args.category]?.model ?? resolved.model ?? sisyphusJuniorModel,
               fallbackChain: requirement.fallbackChain,
               availableModels,
               systemDefaultModel,