diff --git a/src/cli/run/completion-continuation.test.ts b/src/cli/run/completion-continuation.test.ts
index 976277cca..6fd553527 100644
--- a/src/cli/run/completion-continuation.test.ts
+++ b/src/cli/run/completion-continuation.test.ts
@@ -105,6 +105,41 @@ describe("checkCompletionConditions continuation coverage", () => {
     expect(result).toBe(true)
   })
 
+  it("returns true when the mirrored worktree plan is complete even if the main repo plan is stale", async () => {
+    // given
+    spyOn(console, "log").mockImplementation(() => {})
+    const directory = createTempDir()
+    const mainPlanPath = join(directory, ".sisyphus", "plans", "done-in-worktree-plan.md")
+    const worktreeDirectory = createTempDir()
+    const worktreePlanPath = join(worktreeDirectory, ".sisyphus", "plans", "done-in-worktree-plan.md")
+    mkdirSync(join(directory, ".sisyphus", "plans"), { recursive: true })
+    mkdirSync(join(worktreeDirectory, ".sisyphus", "plans"), { recursive: true })
+    writeFileSync(mainPlanPath, "- [ ] stale main repo task\n", "utf-8")
+    writeFileSync(worktreePlanPath, "- [x] completed worktree task\n", "utf-8")
+    const sisyphusDir = join(directory, ".sisyphus")
+    mkdirSync(sisyphusDir, { recursive: true })
+    writeFileSync(
+      join(sisyphusDir, "boulder.json"),
+      JSON.stringify({
+        active_plan: mainPlanPath,
+        started_at: new Date().toISOString(),
+        session_ids: ["test-session"],
+        plan_name: "done-in-worktree-plan",
+        agent: "atlas",
+        worktree_path: worktreeDirectory,
+      }),
+      "utf-8",
+    )
+    const ctx = createMockContext(directory)
+    const { checkCompletionConditions } = await import("./completion")
+
+    // when
+    const result = await checkCompletionConditions(ctx)
+
+    // then
+    expect(result).toBe(true)
+  })
+
   it("returns false when current session is an appended descendant of an active boulder session with unchecked plan items", async () => {
     // given
     spyOn(console, "log").mockImplementation(() => {})
diff --git a/src/cli/run/continuation-state.ts b/src/cli/run/continuation-state.ts
index 07b530812..aeaa65dae 100644
--- a/src/cli/run/continuation-state.ts
+++ b/src/cli/run/continuation-state.ts
@@ -1,4 +1,4 @@
-import { getPlanProgress, readBoulderState } from "../../features/boulder-state"
+import { getPlanProgress, readBoulderState, resolveBoulderPlanPath } from "../../features/boulder-state"
 import { getSessionAgent } from "../../features/claude-code-session-state"
 import {
   getActiveContinuationMarkerReason,
@@ -45,7 +45,7 @@ async function hasActiveBoulderContinuation(
   const boulder = readBoulderState(directory)
   if (!boulder) return false
 
-  const progress = getPlanProgress(boulder.active_plan)
+  const progress = getPlanProgress(resolveBoulderPlanPath(directory, boulder))
   if (progress.isComplete) return false
   if (!client) return false
 
diff --git a/src/features/boulder-state/storage.test.ts b/src/features/boulder-state/storage.test.ts
index 4326b42e0..c424e02eb 100644
--- a/src/features/boulder-state/storage.test.ts
+++ b/src/features/boulder-state/storage.test.ts
@@ -1,6 +1,6 @@
 import { describe, expect, test, beforeEach, afterEach } from "bun:test"
 import { existsSync, mkdirSync, rmSync, writeFileSync } from "node:fs"
-import { join } from "node:path"
+import { dirname, join } from "node:path"
 import { tmpdir } from "node:os"
 import {
   readBoulderState,
@@ -12,6 +12,7 @@ import {
   createBoulderState,
   findPrometheusPlans,
   getTaskSessionState,
+  resolveBoulderPlanPath,
   upsertTaskSessionState,
 } from "./storage"
 import type { BoulderState } from "./types"
@@ -778,4 +779,46 @@ describe("boulder-state", () => {
       expect(state.agent).toBeUndefined()
     })
   })
+
+  describe("resolveBoulderPlanPath", () => {
+    test("should prefer the mirrored worktree plan when it exists", () => {
+      // given
+      const planPath = join(TEST_DIR, ".sisyphus", "plans", "worktree-plan.md")
+      const worktreeDir = join(tmpdir(), `boulder-state-worktree-${Date.now()}`)
+      const worktreePlanPath = join(worktreeDir, ".sisyphus", "plans", "worktree-plan.md")
+      mkdirSync(dirname(planPath), { recursive: true })
+      mkdirSync(dirname(worktreePlanPath), { recursive: true })
+      writeFileSync(planPath, "# Plan\n- [ ] Main repo task\n")
+      writeFileSync(worktreePlanPath, "# Plan\n- [x] Worktree task\n")
+
+      try {
+        // when
+        const resolvedPath = resolveBoulderPlanPath(TEST_DIR, {
+          active_plan: planPath,
+          worktree_path: worktreeDir,
+        })
+
+        // then
+        expect(resolvedPath).toBe(worktreePlanPath)
+      } finally {
+        rmSync(worktreeDir, { recursive: true, force: true })
+      }
+    })
+
+    test("should fall back to the tracked plan when the mirrored worktree plan is missing", () => {
+      // given
+      const planPath = join(TEST_DIR, ".sisyphus", "plans", "fallback-plan.md")
+      mkdirSync(dirname(planPath), { recursive: true })
+      writeFileSync(planPath, "# Plan\n- [ ] Main repo task\n")
+
+      // when
+      const resolvedPath = resolveBoulderPlanPath(TEST_DIR, {
+        active_plan: planPath,
+        worktree_path: join(tmpdir(), `missing-worktree-${Date.now()}`),
+      })
+
+      // then
+      expect(resolvedPath).toBe(planPath)
+    })
+  })
 })
diff --git a/src/features/boulder-state/storage.ts b/src/features/boulder-state/storage.ts
index d570ce525..e11aa31ca 100644
--- a/src/features/boulder-state/storage.ts
+++ b/src/features/boulder-state/storage.ts
@@ -5,7 +5,7 @@
  */
 
 import { existsSync, readFileSync, writeFileSync, mkdirSync, readdirSync } from "node:fs"
-import { dirname, join, basename } from "node:path"
+import { basename, dirname, isAbsolute, join, relative, resolve } from "node:path"
 import type { BoulderState, PlanProgress, TaskSessionState } from "./types"
 import { BOULDER_DIR, BOULDER_FILE, PROMETHEUS_PLANS_DIR } from "./constants"
 
@@ -15,6 +15,39 @@ export function getBoulderFilePath(directory: string): string {
   return join(directory, BOULDER_DIR, BOULDER_FILE)
 }
 
+function resolveTrackedPath(baseDirectory: string, trackedPath: string): string {
+  return isAbsolute(trackedPath)
+    ? resolve(trackedPath)
+    : resolve(baseDirectory, trackedPath)
+}
+
+export function resolveBoulderPlanPath(
+  directory: string,
+  state: Pick<BoulderState, "active_plan" | "worktree_path">,
+): string {
+  const absolutePlanPath = resolveTrackedPath(directory, state.active_plan)
+  const worktreePath = state.worktree_path?.trim()
+  if (!worktreePath) {
+    return absolutePlanPath
+  }
+
+  const absoluteDirectory = resolve(directory)
+  const relativePlanPath = relative(absoluteDirectory, absolutePlanPath)
+  if (
+    relativePlanPath.length === 0
+    || relativePlanPath.startsWith("..")
+    || isAbsolute(relativePlanPath)
+  ) {
+    return absolutePlanPath
+  }
+
+  const absoluteWorktreePath = resolveTrackedPath(directory, worktreePath)
+  const worktreePlanPath = resolve(absoluteWorktreePath, relativePlanPath)
+  return existsSync(worktreePlanPath)
+    ? worktreePlanPath
+    : absolutePlanPath
+}
+
 export function readBoulderState(directory: string): BoulderState | null {
   const filePath = getBoulderFilePath(directory)
 
diff --git a/src/hooks/atlas/background-launch-session-tracking.ts b/src/hooks/atlas/background-launch-session-tracking.ts
index 0e68d6a77..4fcb68864 100644
--- a/src/hooks/atlas/background-launch-session-tracking.ts
+++ b/src/hooks/atlas/background-launch-session-tracking.ts
@@ -1,5 +1,5 @@
 import type { PluginInput } from "@opencode-ai/plugin"
-import { appendSessionId, type BoulderState, upsertTaskSessionState } from "../../features/boulder-state"
+import { appendSessionId, type BoulderState, resolveBoulderPlanPath, upsertTaskSessionState } from "../../features/boulder-state"
 import { log } from "../../shared/logger"
 import { HOOK_NAME } from "./hook-name"
 import { extractSessionIdFromOutput, validateSubagentSessionId } from "./subagent-session-id"
@@ -40,7 +40,7 @@ export async function syncBackgroundLaunchSessionTracking(input: {
 
   const { currentTask, shouldSkipTaskSessionUpdate } = resolveTaskContext(
     pendingTaskRef,
-    boulderState.active_plan,
+    resolveBoulderPlanPath(ctx.directory, boulderState),
   )
 
   if (currentTask && !shouldSkipTaskSessionUpdate) {
diff --git a/src/hooks/atlas/idle-event.ts b/src/hooks/atlas/idle-event.ts
index 41df724bb..9651b1699 100644
--- a/src/hooks/atlas/idle-event.ts
+++ b/src/hooks/atlas/idle-event.ts
@@ -4,6 +4,7 @@ import {
   getTaskSessionState,
   readBoulderState,
   readCurrentTopLevelTask,
+  resolveBoulderPlanPath,
 } from "../../features/boulder-state"
 import { getSessionAgent } from "../../features/claude-code-session-state"
 import { getLastAgentFromSession } from "./session-last-agent"
@@ -52,8 +53,12 @@ async function injectContinuation(input: {
 
   try {
     const currentBoulder = readBoulderState(input.ctx.directory)
+    const currentPlanPath = currentBoulder
+      ? resolveBoulderPlanPath(input.ctx.directory, currentBoulder)
+      : null
     const currentTask = currentBoulder
-      ? readCurrentTopLevelTask(currentBoulder.active_plan)
+      && currentPlanPath
+      ? readCurrentTopLevelTask(currentPlanPath)
       : null
     const preferredTaskSession = currentTask
       ? getTaskSessionState(input.ctx.directory, currentTask.key)
@@ -163,7 +168,7 @@ function scheduleRetry(input: {
     if (!currentBoulder) return
     if (!currentBoulder.session_ids?.includes(sessionID)) return
 
-    const currentProgress = getPlanProgress(currentBoulder.active_plan)
+    const currentProgress = getPlanProgress(resolveBoulderPlanPath(ctx.directory, currentBoulder))
     if (currentProgress.isComplete) return
     if (options?.isContinuationStopped?.(sessionID)) return
     const canContinueSession = await canContinueTrackedBoulderSession({
diff --git a/src/hooks/atlas/index.test.ts b/src/hooks/atlas/index.test.ts
index a2e80cf78..70f6a0591 100644
--- a/src/hooks/atlas/index.test.ts
+++ b/src/hooks/atlas/index.test.ts
@@ -1494,6 +1494,43 @@ session_id: ses_untrusted_999
       expect(mockInput._promptMock).not.toHaveBeenCalled()
     })
 
+    test("should not inject when the mirrored worktree plan is complete even if the main repo plan is stale", async () => {
+      // given
+      const mainPlanPath = join(TEST_DIR, ".sisyphus", "plans", "worktree-complete-plan.md")
+      const worktreeDir = join(tmpdir(), `atlas-worktree-${randomUUID()}`)
+      const worktreePlanPath = join(worktreeDir, ".sisyphus", "plans", "worktree-complete-plan.md")
+      mkdirSync(join(TEST_DIR, ".sisyphus", "plans"), { recursive: true })
+      mkdirSync(join(worktreeDir, ".sisyphus", "plans"), { recursive: true })
+      writeFileSync(mainPlanPath, "# Plan\n- [ ] Main repo task\n")
+      writeFileSync(worktreePlanPath, "# Plan\n- [x] Worktree task\n")
+
+      writeBoulderState(TEST_DIR, {
+        active_plan: mainPlanPath,
+        started_at: "2026-01-02T10:00:00Z",
+        session_ids: [MAIN_SESSION_ID],
+        plan_name: "worktree-complete-plan",
+        worktree_path: worktreeDir,
+      })
+
+      const mockInput = createMockPluginInput()
+      const hook = createAtlasHook(mockInput)
+
+      try {
+        // when
+        await hook.handler({
+          event: {
+            type: "session.idle",
+            properties: { sessionID: MAIN_SESSION_ID },
+          },
+        })
+
+        // then
+        expect(mockInput._promptMock).not.toHaveBeenCalled()
+      } finally {
+        rmSync(worktreeDir, { recursive: true, force: true })
+      }
+    })
+
     test("should skip when abort error occurred before idle", async () => {
       // given - boulder state with incomplete plan
       const planPath = join(TEST_DIR, "test-plan.md")
diff --git a/src/hooks/atlas/resolve-active-boulder-session.test.ts b/src/hooks/atlas/resolve-active-boulder-session.test.ts
index b3eb28b13..7a300a517 100644
--- a/src/hooks/atlas/resolve-active-boulder-session.test.ts
+++ b/src/hooks/atlas/resolve-active-boulder-session.test.ts
@@ -1,7 +1,7 @@
 import { afterEach, beforeEach, describe, expect, test } from "bun:test"
 import { existsSync, mkdirSync, rmSync, writeFileSync } from "node:fs"
 import { tmpdir } from "node:os"
-import { join } from "node:path"
+import { dirname, join } from "node:path"
 import { randomUUID } from "node:crypto"
 import { clearBoulderState, writeBoulderState } from "../../features/boulder-state"
 import { resolveActiveBoulderSession } from "./resolve-active-boulder-session"
@@ -96,4 +96,39 @@ describe("resolveActiveBoulderSession", () => {
     expect(result?.progress.isComplete).toBe(false)
     expect(result?.boulderState.session_ids).toContain("ses_appended")
   })
+
+  test("returns complete progress when a mirrored worktree plan is complete", async () => {
+    // given
+    const mainPlanPath = join(testDirectory, ".sisyphus", "plans", "worktree-plan.md")
+    const worktreeDirectory = join(tmpdir(), `resolve-active-boulder-worktree-${randomUUID()}`)
+    const worktreePlanPath = join(worktreeDirectory, ".sisyphus", "plans", "worktree-plan.md")
+    mkdirSync(dirname(mainPlanPath), { recursive: true })
+    mkdirSync(dirname(worktreePlanPath), { recursive: true })
+    writeFileSync(mainPlanPath, "# Plan\n- [ ] Main repo task\n", "utf-8")
+    writeFileSync(worktreePlanPath, "# Plan\n- [x] Worktree task\n", "utf-8")
+    writeBoulderState(testDirectory, {
+      active_plan: mainPlanPath,
+      started_at: "2026-01-02T10:00:00Z",
+      session_ids: ["ses_tracked"],
+      session_origins: { ses_tracked: "direct" },
+      plan_name: "worktree-plan",
+      worktree_path: worktreeDirectory,
+    })
+
+    try {
+      // when
+      const result = await resolveActiveBoulderSession({
+        client: { session: { get: async () => ({ data: {} }) } } as never,
+        directory: testDirectory,
+        sessionID: "ses_tracked",
+      })
+
+      // then
+      expect(result).not.toBeNull()
+      expect(result?.progress.isComplete).toBe(true)
+      expect(result?.progress.completed).toBe(1)
+    } finally {
+      rmSync(worktreeDirectory, { recursive: true, force: true })
+    }
+  })
 })
diff --git a/src/hooks/atlas/resolve-active-boulder-session.ts b/src/hooks/atlas/resolve-active-boulder-session.ts
index 7e8f3c4cd..7cf23e7ba 100644
--- a/src/hooks/atlas/resolve-active-boulder-session.ts
+++ b/src/hooks/atlas/resolve-active-boulder-session.ts
@@ -1,5 +1,5 @@
 import type { PluginInput } from "@opencode-ai/plugin"
-import { getPlanProgress, readBoulderState } from "../../features/boulder-state"
+import { getPlanProgress, readBoulderState, resolveBoulderPlanPath } from "../../features/boulder-state"
 import type { BoulderState, PlanProgress } from "../../features/boulder-state"
 
 export async function resolveActiveBoulderSession(input: {
@@ -20,7 +20,7 @@ export async function resolveActiveBoulderSession(input: {
     return null
   }
 
-  const progress = getPlanProgress(boulderState.active_plan)
+  const progress = getPlanProgress(resolveBoulderPlanPath(input.directory, boulderState))
   if (progress.isComplete) {
     return { boulderState, progress, appendedSession: false }
   }
diff --git a/src/hooks/atlas/tool-execute-after.ts b/src/hooks/atlas/tool-execute-after.ts
index 5fd5808ed..586eaf088 100644
--- a/src/hooks/atlas/tool-execute-after.ts
+++ b/src/hooks/atlas/tool-execute-after.ts
@@ -4,6 +4,7 @@ import {
   getPlanProgress,
   getTaskSessionState,
   readBoulderState,
+  resolveBoulderPlanPath,
   upsertTaskSessionState,
 } from "../../features/boulder-state"
 import { log } from "../../shared/logger"
@@ -98,12 +99,13 @@ export function createToolExecuteAfterHandler(input: {
       const extractedSessionId = metadataSessionId ?? extractSessionIdFromOutput(toolOutput.output)
 
       if (boulderState) {
-        const progress = getPlanProgress(boulderState.active_plan)
+        const planPath = resolveBoulderPlanPath(ctx.directory, boulderState)
+        const progress = getPlanProgress(planPath)
         const {
           currentTask,
           shouldSkipTaskSessionUpdate,
           shouldIgnoreCurrentSessionId,
-        } = resolveTaskContext(pendingTaskRef, boulderState.active_plan)
+        } = resolveTaskContext(pendingTaskRef, planPath)
         const trackedTaskSession = currentTask
           ? getTaskSessionState(ctx.directory, currentTask.key)
           : null
@@ -136,7 +138,7 @@ export function createToolExecuteAfterHandler(input: {
         const originalResponse = toolOutput.output
         const shouldPauseForApproval = sessionState
           ? shouldPauseForFinalWaveApproval({
-              planPath: boulderState.active_plan,
+              planPath,
               taskOutput: originalResponse,
               sessionState,
             })
diff --git a/src/hooks/atlas/tool-execute-before.ts b/src/hooks/atlas/tool-execute-before.ts
index e00224d84..e6ccae501 100644
--- a/src/hooks/atlas/tool-execute-before.ts
+++ b/src/hooks/atlas/tool-execute-before.ts
@@ -2,7 +2,7 @@ import { log } from "../../shared/logger"
 import { SYSTEM_DIRECTIVE_PREFIX } from "../../shared/system-directive"
 import { isCallerOrchestrator } from "../../shared/session-utils"
 import type { PluginInput } from "@opencode-ai/plugin"
-import { readBoulderState, readCurrentTopLevelTask } from "../../features/boulder-state"
+import { readBoulderState, readCurrentTopLevelTask, resolveBoulderPlanPath } from "../../features/boulder-state"
 import { HOOK_NAME } from "./hook-name"
 import { ORCHESTRATOR_DELEGATION_REQUIRED, SINGLE_TASK_DIRECTIVE } from "./system-reminder-templates"
 import { isSisyphusPath } from "./sisyphus-path"
@@ -60,7 +60,7 @@ export function createToolExecuteBeforeHandler(input: {
         } else {
           const boulderState = readBoulderState(ctx.directory)
           const currentTask = boulderState
-            ? readCurrentTopLevelTask(boulderState.active_plan)
+            ? readCurrentTopLevelTask(resolveBoulderPlanPath(ctx.directory, boulderState))
             : null
           if (currentTask) {
             const task = {
diff --git a/src/hooks/start-work/context-info-builder.ts b/src/hooks/start-work/context-info-builder.ts
index e83474844..4ad7859c0 100644
--- a/src/hooks/start-work/context-info-builder.ts
+++ b/src/hooks/start-work/context-info-builder.ts
@@ -7,6 +7,7 @@ import {
   getPlanName,
   getPlanProgress,
   readBoulderState,
+  resolveBoulderPlanPath,
   writeBoulderState,
 } from "../../features/boulder-state"
 import { log } from "../../shared/logger"
@@ -150,7 +151,8 @@ function buildExistingSessionContext(params: {
   directory: string
 }): string {
   const { existingState, sessionId, activeAgent, worktreePath, worktreeBlock, directory } = params
-  const progress = getPlanProgress(existingState.active_plan)
+  const planPath = resolveBoulderPlanPath(directory, existingState)
+  const progress = getPlanProgress(planPath)
   if (progress.isComplete) {
     return `
 ## Previous Work Complete
@@ -186,7 +188,7 @@ Looking for new plans...`
 
 **Status**: RESUMING existing work
 **Plan**: ${existingState.plan_name}
-**Path**: ${existingState.active_plan}
+**Path**: ${planPath}
 **Progress**: ${progress.completed}/${progress.total} tasks completed
 **Sessions**: ${existingState.session_ids.length + 1} (current session appended)
 **Started**: ${existingState.started_at}
@@ -197,11 +199,16 @@ Read the plan file and continue from the first unchecked task.`
 }
 
 function shouldDiscoverPlans(
+  directory: string,
   existingState: ReturnType<typeof readBoulderState>,
   explicitPlanName: string | null,
 ): boolean {
   return (!existingState && !explicitPlanName)
-    || (existingState !== null && !explicitPlanName && getPlanProgress(existingState.active_plan).isComplete)
+    || (
+      existingState !== null
+      && !explicitPlanName
+      && getPlanProgress(resolveBoulderPlanPath(directory, existingState)).isComplete
+    )
 }
 
 function buildPlanDiscoveryContext(params: {
@@ -303,7 +310,7 @@ export function buildStartWorkContextInfo(params: {
     })
   }
 
-  if (shouldDiscoverPlans(existingState, explicitPlanName)) {
+  if (shouldDiscoverPlans(ctx.directory, existingState, explicitPlanName)) {
     return buildPlanDiscoveryContext({
       contextInfo,
       sessionId,
diff --git a/src/hooks/start-work/index.test.ts b/src/hooks/start-work/index.test.ts
index 36887ee8e..e33a4f6a7 100644
--- a/src/hooks/start-work/index.test.ts
+++ b/src/hooks/start-work/index.test.ts
@@ -2,7 +2,7 @@
 
 import { describe, expect, test, beforeEach, afterEach, spyOn } from "bun:test"
 import { existsSync, mkdirSync, rmSync, writeFileSync } from "node:fs"
-import { join } from "node:path"
+import { dirname, join } from "node:path"
 import { tmpdir } from "node:os"
 import { randomUUID } from "node:crypto"
 import { createStartWorkHook } from "./index"
@@ -1013,5 +1013,39 @@ You are starting a Sisyphus work session.
       expect(output.parts[0].text).toContain("subagent")
       expect(output.parts[0].text).not.toContain("Worktree Setup Required")
     })
+
+    test("should show worktree plan progress and path when the mirrored plan exists", async () => {
+      // given
+      const mainPlanPath = join(testDir, ".sisyphus", "plans", "resume-worktree-plan.md")
+      const worktreeDir = join(testDir, "..", `resume-worktree-${randomUUID()}`)
+      const worktreePlanPath = join(worktreeDir, ".sisyphus", "plans", "resume-worktree-plan.md")
+      mkdirSync(dirname(mainPlanPath), { recursive: true })
+      mkdirSync(dirname(worktreePlanPath), { recursive: true })
+      writeFileSync(mainPlanPath, "# Plan\n- [ ] Main repo task\n")
+      writeFileSync(worktreePlanPath, "# Plan\n- [x] Worktree task 1\n- [ ] Worktree task 2\n")
+      writeBoulderState(testDir, {
+        active_plan: mainPlanPath,
+        started_at: "2026-01-01T00:00:00Z",
+        session_ids: ["old-session"],
+        plan_name: "resume-worktree-plan",
+        worktree_path: worktreeDir,
+      })
+
+      const hook = createStartWorkHook(createMockPluginInput())
+      const output = {
+        parts: [{ type: "text", text: createStartWorkPrompt() }],
+      }
+
+      try {
+        // when
+        await hook["chat.message"]({ sessionID: "session-worktree-progress" }, output)
+
+        // then
+        expect(output.parts[0].text).toContain(worktreePlanPath)
+        expect(output.parts[0].text).toContain("1/2 tasks completed")
+      } finally {
+        rmSync(worktreeDir, { recursive: true, force: true })
+      }
+    })
   })
 })