diff --git a/apps/sim/lib/copilot/generated/tool-catalog-v1.ts b/apps/sim/lib/copilot/generated/tool-catalog-v1.ts
index 616244da295..fd373749aa3 100644
--- a/apps/sim/lib/copilot/generated/tool-catalog-v1.ts
+++ b/apps/sim/lib/copilot/generated/tool-catalog-v1.ts
@@ -1040,6 +1040,11 @@ export const FunctionExecute: ToolCatalogEntry = {
         description:
           'Table ID to overwrite with the code\'s return value. Code MUST return an array of objects where keys match column names. All existing rows are replaced. Example: "tbl_abc123"',
       },
+      timeout: {
+        type: 'number',
+        description:
+          'Optional maximum execution time in seconds. If omitted, Copilot sends 10 seconds by default. Override when needed; capped at the default execution limit.',
+      },
     },
     required: ['code'],
   },
diff --git a/apps/sim/lib/copilot/generated/tool-schemas-v1.ts b/apps/sim/lib/copilot/generated/tool-schemas-v1.ts
index bb329500012..9cd31211322 100644
--- a/apps/sim/lib/copilot/generated/tool-schemas-v1.ts
+++ b/apps/sim/lib/copilot/generated/tool-schemas-v1.ts
@@ -4,7 +4,7 @@
 
 export type JsonSchema = unknown
 
-interface ToolRuntimeSchemaEntry {
+export interface ToolRuntimeSchemaEntry {
   parameters?: JsonSchema
   resultSchema?: JsonSchema
 }
@@ -863,6 +863,11 @@ export const TOOL_RUNTIME_SCHEMAS: Record<string, ToolRuntimeSchemaEntry> = {
           description:
             'Table ID to overwrite with the code\'s return value. Code MUST return an array of objects where keys match column names. All existing rows are replaced. Example: "tbl_abc123"',
         },
+        timeout: {
+          type: 'number',
+          description:
+            'Optional maximum execution time in seconds. If omitted, Copilot sends 10 seconds by default. Override when needed; capped at the default execution limit.',
+        },
       },
       required: ['code'],
     },
diff --git a/apps/sim/lib/copilot/tool-executor/executor.test.ts b/apps/sim/lib/copilot/tool-executor/executor.test.ts
index 4ae97dd45c7..a0cd2eec358 100644
--- a/apps/sim/lib/copilot/tool-executor/executor.test.ts
+++ b/apps/sim/lib/copilot/tool-executor/executor.test.ts
@@ -3,6 +3,7 @@
  */
 
 import { beforeEach, describe, expect, it, vi } from 'vitest'
+import { DEFAULT_EXECUTION_TIMEOUT_MS } from '@/lib/execution/constants'
 
 const { isKnownTool, isSimExecuted } = vi.hoisted(() => ({
   isKnownTool: vi.fn(),
@@ -58,4 +59,107 @@ describe('copilot tool executor fallback', () => {
     )
     expect(result).toEqual({ success: true, output: { emails: [] } })
   })
+
+  it('converts function_execute timeout from seconds to milliseconds for copilot calls', async () => {
+    isKnownTool.mockReturnValue(false)
+    isSimExecuted.mockReturnValue(false)
+    executeAppTool.mockResolvedValue({ success: true, output: { result: 'ok' } })
+
+    await executeTool(
+      'function_execute',
+      { code: 'return 1', timeout: 7 },
+      {
+        userId: 'user-1',
+        workflowId: 'workflow-1',
+        workspaceId: 'ws-1',
+        copilotToolExecution: true,
+      }
+    )
+
+    expect(executeAppTool).toHaveBeenCalledWith(
+      'function_execute',
+      expect.objectContaining({
+        timeout: 7000,
+        _context: expect.objectContaining({
+          copilotToolExecution: true,
+        }),
+      }),
+      false
+    )
+  })
+
+  it('defaults copilot function_execute timeout to 10 seconds when omitted', async () => {
+    isKnownTool.mockReturnValue(false)
+    isSimExecuted.mockReturnValue(false)
+    executeAppTool.mockResolvedValue({ success: true, output: { result: 'ok' } })
+
+    await executeTool(
+      'function_execute',
+      { code: 'return 1' },
+      {
+        userId: 'user-1',
+        workflowId: 'workflow-1',
+        workspaceId: 'ws-1',
+        copilotToolExecution: true,
+      }
+    )
+
+    expect(executeAppTool).toHaveBeenCalledWith(
+      'function_execute',
+      expect.objectContaining({
+        timeout: 10_000,
+      }),
+      false
+    )
+  })
+
+  it('defaults copilot function_execute timeout to 10 seconds when invalid', async () => {
+    isKnownTool.mockReturnValue(false)
+    isSimExecuted.mockReturnValue(false)
+    executeAppTool.mockResolvedValue({ success: true, output: { result: 'ok' } })
+
+    await executeTool(
+      'function_execute',
+      { code: 'return 1', timeout: 0 },
+      {
+        userId: 'user-1',
+        workflowId: 'workflow-1',
+        workspaceId: 'ws-1',
+        copilotToolExecution: true,
+      }
+    )
+
+    expect(executeAppTool).toHaveBeenCalledWith(
+      'function_execute',
+      expect.objectContaining({
+        timeout: 10_000,
+      }),
+      false
+    )
+  })
+
+  it('does not let copilot function_execute timeout exceed the default execution limit', async () => {
+    isKnownTool.mockReturnValue(false)
+    isSimExecuted.mockReturnValue(false)
+    executeAppTool.mockResolvedValue({ success: true, output: { result: 'ok' } })
+
+    await executeTool(
+      'function_execute',
+      { code: 'return 1', timeout: 10_000 },
+      {
+        userId: 'user-1',
+        workflowId: 'workflow-1',
+        workspaceId: 'ws-1',
+        copilotToolExecution: true,
+      }
+    )
+
+    expect(executeAppTool).toHaveBeenCalledWith(
+      'function_execute',
+      expect.objectContaining({
+        timeout: DEFAULT_EXECUTION_TIMEOUT_MS,
+      }),
+      false
+    )
+  })
 })
diff --git a/apps/sim/lib/copilot/tool-executor/executor.ts b/apps/sim/lib/copilot/tool-executor/executor.ts
index 7658a25e70e..869228970bf 100644
--- a/apps/sim/lib/copilot/tool-executor/executor.ts
+++ b/apps/sim/lib/copilot/tool-executor/executor.ts
@@ -1,5 +1,6 @@
 import { createLogger } from '@sim/logger'
 import { toError } from '@sim/utils/errors'
+import { DEFAULT_EXECUTION_TIMEOUT_MS } from '@/lib/execution/constants'
 import { executeTool as executeAppTool } from '@/tools'
 import { isKnownTool, isSimExecuted } from './router'
 import type {
@@ -10,6 +11,9 @@ import type {
 } from './types'
 
 const logger = createLogger('ToolExecutor')
+const FUNCTION_EXECUTE_TOOL_ID = 'function_execute'
+const DEFAULT_FUNCTION_EXECUTE_TIMEOUT_SECONDS = 10
+const MILLISECONDS_PER_SECOND = 1000
 
 const handlerRegistry = new Map<string, ToolHandler>()
 
@@ -38,7 +42,7 @@ export async function executeTool(
 ): Promise<ToolExecutionResult> {
   const canUseRegisteredHandler = isKnownTool(toolId) && isSimExecuted(toolId)
   if (!canUseRegisteredHandler) {
-    const appParams = buildAppToolParams(params, context)
+    const appParams = buildAppToolParams(toolId, params, context)
     return executeAppTool(toolId, appParams, false)
   }
 
@@ -95,11 +99,27 @@ async function executeToolBatch(
 }
 
 function buildAppToolParams(
+  toolId: string,
   params: Record<string, unknown>,
   context: ToolExecutionContext
 ): Record<string, unknown> {
   const result = { ...params }
 
+  if (toolId === FUNCTION_EXECUTE_TOOL_ID && context.copilotToolExecution) {
+    const rawTimeoutSeconds =
+      result.timeout === undefined || result.timeout === null
+        ? DEFAULT_FUNCTION_EXECUTE_TIMEOUT_SECONDS
+        : Number(result.timeout)
+    const timeoutSeconds =
+      Number.isFinite(rawTimeoutSeconds) && rawTimeoutSeconds > 0
+        ? rawTimeoutSeconds
+        : DEFAULT_FUNCTION_EXECUTE_TIMEOUT_SECONDS
+    result.timeout = Math.min(
+      Math.ceil(timeoutSeconds * MILLISECONDS_PER_SECOND),
+      DEFAULT_EXECUTION_TIMEOUT_MS
+    )
+  }
+
   if (result.credentialId && !result.credential && !result.oauthCredential) {
     result.credential = result.credentialId
   }
diff --git a/apps/sim/tools/function/types.ts b/apps/sim/tools/function/types.ts
index d44d509174e..decb3978871 100644
--- a/apps/sim/tools/function/types.ts
+++ b/apps/sim/tools/function/types.ts
@@ -7,6 +7,10 @@ export interface CodeExecutionInput {
   sourceCode?: string
   language?: CodeLanguage
   useLocalVM?: boolean
+  /**
+   * Workflow Function blocks pass milliseconds. Copilot/Mothership tool calls pass seconds
+   * and are converted at the request boundary.
+   */
   timeout?: number
   memoryLimit?: number
   outputPath?: string
@@ -28,6 +32,7 @@ export interface CodeExecutionInput {
     allowLargeValueWorkflowScope?: boolean
     userId?: string
     workspaceId?: string
+    copilotToolExecution?: boolean
   }
   isCustomTool?: boolean
   _sandboxFiles?: Array<{ path: string; content: string }>