diff --git a/src/features/background-agent/manager.ts b/src/features/background-agent/manager.ts
index b2d4a40ab..3a680dd6a 100644
--- a/src/features/background-agent/manager.ts
+++ b/src/features/background-agent/manager.ts
@@ -7,6 +7,7 @@ import type {
 } from "./types"
 import { TaskHistory } from "./task-history"
 import { log, getAgentToolRestrictions, promptWithModelSuggestionRetry } from "../../shared"
+import { setSessionTools } from "../../shared/session-tools-store"
 import { ConcurrencyManager } from "./concurrency"
 import type { BackgroundTaskConfig, TmuxConfig } from "../../config/schema"
 import { isInsideTmux } from "../../shared/tmux"
@@ -141,6 +142,7 @@ export class BackgroundManager {
       parentMessageID: input.parentMessageID,
       parentModel: input.parentModel,
       parentAgent: input.parentAgent,
+      parentTools: input.parentTools,
       model: input.model,
       category: input.category,
     }
@@ -328,12 +330,16 @@ export class BackgroundManager {
         ...(launchModel ? { model: launchModel } : {}),
         ...(launchVariant ? { variant: launchVariant } : {}),
         system: input.skillContent,
-        tools: {
-          ...getAgentToolRestrictions(input.agent),
-          task: false,
-          call_omo_agent: true,
-          question: false,
-        },
+        tools: (() => {
+          const tools = {
+            ...getAgentToolRestrictions(input.agent),
+            task: false,
+            call_omo_agent: true,
+            question: false,
+          }
+          setSessionTools(sessionID, tools)
+          return tools
+        })(),
         parts: [{ type: "text", text: input.prompt }],
       },
     }).catch((error) => {
@@ -535,6 +541,9 @@ export class BackgroundManager {
     existingTask.parentMessageID = input.parentMessageID
     existingTask.parentModel = input.parentModel
     existingTask.parentAgent = input.parentAgent
+    if (input.parentTools) {
+      existingTask.parentTools = input.parentTools
+    }
     // Reset startedAt on resume to prevent immediate completion
     // The MIN_IDLE_TIME_MS check uses startedAt, so resumed tasks need fresh timing
     existingTask.startedAt = new Date()
@@ -588,12 +597,16 @@ export class BackgroundManager {
         agent: existingTask.agent,
         ...(resumeModel ? { model: resumeModel } : {}),
         ...(resumeVariant ? { variant: resumeVariant } : {}),
-        tools: {
-          ...getAgentToolRestrictions(existingTask.agent),
-          task: false,
-          call_omo_agent: true,
-          question: false,
-        },
+        tools: (() => {
+          const tools = {
+            ...getAgentToolRestrictions(existingTask.agent),
+            task: false,
+            call_omo_agent: true,
+            question: false,
+          }
+          setSessionTools(existingTask.sessionID!, tools)
+          return tools
+        })(),
         parts: [{ type: "text", text: input.prompt }],
       },
     }).catch((error) => {
@@ -1252,6 +1265,7 @@ Use \`background_output(task_id="${task.id}")\` to retrieve this result when rea
           noReply: !allComplete,
           ...(agent !== undefined ? { agent } : {}),
           ...(model !== undefined ? { model } : {}),
+          ...(task.parentTools ? { tools: task.parentTools } : {}),
           parts: [{ type: "text", text: notification }],
         },
       })
diff --git a/src/features/background-agent/spawner/task-factory.ts b/src/features/background-agent/spawner/task-factory.ts
index 7af433d41..e7788be7f 100644
--- a/src/features/background-agent/spawner/task-factory.ts
+++ b/src/features/background-agent/spawner/task-factory.ts
@@ -13,6 +13,7 @@ export function createTask(input: LaunchInput): BackgroundTask {
     parentMessageID: input.parentMessageID,
     parentModel: input.parentModel,
     parentAgent: input.parentAgent,
+    parentTools: input.parentTools,
     model: input.model,
   }
 }
diff --git a/src/tools/call-omo-agent/background-agent-executor.ts b/src/tools/call-omo-agent/background-agent-executor.ts
index 35cb5fe1c..7babb43c0 100644
--- a/src/tools/call-omo-agent/background-agent-executor.ts
+++ b/src/tools/call-omo-agent/background-agent-executor.ts
@@ -5,6 +5,7 @@ import { log } from "../../shared"
 import type { CallOmoAgentArgs } from "./types"
 import type { ToolContextWithMetadata } from "./tool-context-with-metadata"
 import { getMessageDir } from "./message-storage-directory"
+import { getSessionTools } from "../../shared/session-tools-store"
 
 export async function executeBackgroundAgent(
 	args: CallOmoAgentArgs,
@@ -36,6 +37,7 @@ export async function executeBackgroundAgent(
 			parentSessionID: toolContext.sessionID,
 			parentMessageID: toolContext.messageID,
 			parentAgent,
+			parentTools: getSessionTools(toolContext.sessionID),
 		})
 
 		const waitStart = Date.now()
diff --git a/src/tools/call-omo-agent/background-executor.ts b/src/tools/call-omo-agent/background-executor.ts
index a89fff40b..5751664ab 100644
--- a/src/tools/call-omo-agent/background-executor.ts
+++ b/src/tools/call-omo-agent/background-executor.ts
@@ -5,6 +5,7 @@ import { consumeNewMessages } from "../../shared/session-cursor"
 import { findFirstMessageWithAgent, findNearestMessageWithFields } from "../../features/hook-message-injector"
 import { getSessionAgent } from "../../features/claude-code-session-state"
 import { getMessageDir } from "./message-dir"
+import { getSessionTools } from "../../shared/session-tools-store"
 
 export async function executeBackground(
   args: CallOmoAgentArgs,
@@ -41,6 +42,7 @@ export async function executeBackground(
       parentSessionID: toolContext.sessionID,
       parentMessageID: toolContext.messageID,
       parentAgent,
+      parentTools: getSessionTools(toolContext.sessionID),
     })
 
     const WAIT_FOR_SESSION_INTERVAL_MS = 50
diff --git a/src/tools/delegate-task/background-continuation.ts b/src/tools/delegate-task/background-continuation.ts
index 71e209705..a6e382930 100644
--- a/src/tools/delegate-task/background-continuation.ts
+++ b/src/tools/delegate-task/background-continuation.ts
@@ -2,6 +2,7 @@ import type { DelegateTaskArgs, ToolContextWithMetadata } from "./types"
 import type { ExecutorContext, ParentContext } from "./executor-types"
 import { storeToolMetadata } from "../../features/tool-metadata-store"
 import { formatDetailedError } from "./error-formatting"
+import { getSessionTools } from "../../shared/session-tools-store"
 
 export async function executeBackgroundContinuation(
   args: DelegateTaskArgs,
@@ -19,6 +20,7 @@ export async function executeBackgroundContinuation(
       parentMessageID: parentContext.messageID,
       parentModel: parentContext.model,
       parentAgent: parentContext.agent,
+      parentTools: getSessionTools(parentContext.sessionID),
     })
 
     const bgContMeta = {
diff --git a/src/tools/delegate-task/background-task.ts b/src/tools/delegate-task/background-task.ts
index 35d9af9af..e724695b2 100644
--- a/src/tools/delegate-task/background-task.ts
+++ b/src/tools/delegate-task/background-task.ts
@@ -3,6 +3,7 @@ import type { ExecutorContext, ParentContext } from "./executor-types"
 import { getTimingConfig } from "./timing"
 import { storeToolMetadata } from "../../features/tool-metadata-store"
 import { formatDetailedError } from "./error-formatting"
+import { getSessionTools } from "../../shared/session-tools-store"
 
 export async function executeBackgroundTask(
   args: DelegateTaskArgs,
@@ -24,6 +25,7 @@ export async function executeBackgroundTask(
       parentMessageID: parentContext.messageID,
       parentModel: parentContext.model,
       parentAgent: parentContext.agent,
+      parentTools: getSessionTools(parentContext.sessionID),
       model: categoryModel,
       skills: args.load_skills.length > 0 ? args.load_skills : undefined,
       skillContent: systemContent,
diff --git a/src/tools/delegate-task/unstable-agent-task.ts b/src/tools/delegate-task/unstable-agent-task.ts
index ae97153bd..9e0bf8533 100644
--- a/src/tools/delegate-task/unstable-agent-task.ts
+++ b/src/tools/delegate-task/unstable-agent-task.ts
@@ -4,6 +4,7 @@ import { getTimingConfig } from "./timing"
 import { storeToolMetadata } from "../../features/tool-metadata-store"
 import { formatDuration } from "./time-formatter"
 import { formatDetailedError } from "./error-formatting"
+import { getSessionTools } from "../../shared/session-tools-store"
 
 export async function executeUnstableAgentTask(
   args: DelegateTaskArgs,
@@ -26,6 +27,7 @@ export async function executeUnstableAgentTask(
       parentMessageID: parentContext.messageID,
       parentModel: parentContext.model,
       parentAgent: parentContext.agent,
+      parentTools: getSessionTools(parentContext.sessionID),
       model: categoryModel,
       skills: args.load_skills.length > 0 ? args.load_skills : undefined,
       skillContent: systemContent,