diff --git a/apps/stage-tamagotchi/src/renderer/stores/chat-sync.test.ts b/apps/stage-tamagotchi/src/renderer/stores/chat-sync.test.ts
index 4132e16f5..111ea4943 100644
--- a/apps/stage-tamagotchi/src/renderer/stores/chat-sync.test.ts
+++ b/apps/stage-tamagotchi/src/renderer/stores/chat-sync.test.ts
@@ -1,3 +1,5 @@
+// @vitest-environment jsdom
+
 import type { Ref } from 'vue'
 
 import { createPinia, setActivePinia } from 'pinia'
@@ -142,6 +144,7 @@ describe('useChatSyncStore authority ingest failures', async () => {
   beforeEach(() => {
     setActivePinia(createPinia())
     MockBroadcastChannel.reset()
+    vi.restoreAllMocks()
 
     const activeSessionId = ref('session-1')
     const sessionMessages = ref<Record<string, Array<{ role: string, content: string }>>>({
@@ -194,6 +197,7 @@ describe('useChatSyncStore authority ingest failures', async () => {
    * })
    */
   it('stores command ingest errors in authority session history', async () => {
+    const consoleError = vi.spyOn(console, 'error').mockImplementation(() => {})
     const store = useChatSyncStore()
     store.initialize('authority')
 
@@ -218,11 +222,55 @@ describe('useChatSyncStore authority ingest failures', async () => {
     expect(persistedMessages).toHaveLength(2)
     expect(persistedMessages[1]?.role).toBe('error')
     expect(persistedMessages[1]?.content).toContain('This model is not available in your region')
+    expect(consoleError).toHaveBeenCalledWith('[chat-sync] command failed', expect.objectContaining({
+      command: 'ingest',
+      requestId: 'req-1',
+      errorMessage: expect.stringContaining('This model is not available in your region'),
+      payload: expect.objectContaining({
+        text: 'hello',
+        sessionId: 'session-1',
+      }),
+    }))
 
     peer.close()
     store.dispose()
   })
 
+  /**
+   * @example
+   * await expect(store.requestIngest({ text: 'hello' })).rejects.toThrow(/timed out/i)
+   * expect(console.error).toHaveBeenCalledWith('[chat-sync] command timed out waiting for authority response', expect.any(Object))
+   */
+  it('logs follower command timeouts with request metadata', async () => {
+    vi.useFakeTimers()
+    const consoleError = vi.spyOn(console, 'error').mockImplementation(() => {})
+    const store = useChatSyncStore()
+    store.initialize('follower')
+
+    const pending = store.requestIngest({
+      text: 'hello timeout',
+      sessionId: 'session-1',
+    })
+    const expectedRejection = expect(pending).rejects.toThrow('Timed out waiting for chat authority response')
+
+    await vi.advanceTimersByTimeAsync(30000)
+
+    await expectedRejection
+    expect(consoleError).toHaveBeenCalledWith('[chat-sync] command timed out waiting for authority response', expect.objectContaining({
+      command: 'ingest',
+      mode: 'follower',
+      requestId: expect.any(String),
+      errorMessage: 'Timed out waiting for chat authority response',
+      payload: expect.objectContaining({
+        text: 'hello timeout',
+        sessionId: 'session-1',
+      }),
+    }))
+
+    store.dispose()
+    vi.useRealTimers()
+  })
+
   /**
    * @example
    * it('replaces the last failed turn before retrying', async () => {
diff --git a/apps/stage-tamagotchi/src/renderer/stores/chat-sync.ts b/apps/stage-tamagotchi/src/renderer/stores/chat-sync.ts
index 0a848b55e..d1d70930c 100644
--- a/apps/stage-tamagotchi/src/renderer/stores/chat-sync.ts
+++ b/apps/stage-tamagotchi/src/renderer/stores/chat-sync.ts
@@ -119,6 +119,44 @@ function resolveRetrySourceIndex(messages: ChatHistoryItem[], index: number): nu
   return -1
 }
 
+function previewChatSyncPayload(payload: unknown): unknown {
+  if (!payload || typeof payload !== 'object') {
+    return payload
+  }
+
+  const record = payload as Record<string, unknown>
+  const text = typeof record.text === 'string' ? record.text : undefined
+
+  return {
+    ...record,
+    text: text && text.length > 160 ? `${text.slice(0, 160)}...` : text,
+    attachments: Array.isArray(record.attachments)
+      ? `[${record.attachments.length} attachment(s)]`
+      : record.attachments,
+  }
+}
+
+/**
+ * Logs chat-sync failures at the BroadcastChannel boundary.
+ *
+ * Use when:
+ * - A follower window times out waiting for the authority window
+ * - The authority window fails while executing a forwarded chat command
+ *
+ * Expects:
+ * - `details` only contains structured-clone-friendly diagnostic metadata
+ *
+ * Returns:
+ * - Writes an error entry to the renderer console for postmortem debugging
+ */
+function logChatSyncError(message: string, error: unknown, details: Record<string, unknown>) {
+  console.error(`[chat-sync] ${message}`, {
+    ...details,
+    error,
+    errorMessage: errorMessageFrom(error) ?? String(error),
+  })
+}
+
 export const useChatSyncStore = defineStore('stage-tamagotchi:chat-sync', () => {
   const instanceId = `${Date.now().toString(36)}-${Math.random().toString(36).slice(2, 10)}`
   const mode = ref<ChatSyncMode>('inactive')
@@ -363,6 +401,15 @@ export const useChatSyncStore = defineStore('stage-tamagotchi:chat-sync', () =>
     catch (error) {
       const errorMessage = errorMessageFrom(error) ?? 'Unknown chat sync command failure'
 
+      logChatSyncError('command failed', error, {
+        mode: mode.value,
+        authorityId: authorityId.value,
+        requestId: message.requestId,
+        senderId: message.senderId,
+        command: message.command,
+        payload: previewChatSyncPayload(message.payload),
+      })
+
       if (message.command === 'ingest')
         appendIngestErrorMessage(message.payload, errorMessage)
 
@@ -469,7 +516,16 @@ export const useChatSyncStore = defineStore('stage-tamagotchi:chat-sync', () =>
     return new Promise<void>((resolve, reject) => {
       const timeout = setTimeout(() => {
         pendingRequests.delete(message.requestId)
-        reject(new Error('Timed out waiting for chat authority response'))
+        const error = new Error('Timed out waiting for chat authority response')
+        logChatSyncError('command timed out waiting for authority response', error, {
+          mode: mode.value,
+          authorityId: authorityId.value,
+          requestId: message.requestId,
+          senderId: message.senderId,
+          command: message.command,
+          payload: previewChatSyncPayload(message.payload),
+        })
+        reject(error)
       }, REQUEST_TIMEOUT_MS)
 
       pendingRequests.set(message.requestId, { resolve, reject, timeout })
diff --git a/apps/stage-tamagotchi/src/renderer/stores/tools/builtin/image-journal.test.ts b/apps/stage-tamagotchi/src/renderer/stores/tools/builtin/image-journal.test.ts
index c5a4669a8..e99abf33b 100644
--- a/apps/stage-tamagotchi/src/renderer/stores/tools/builtin/image-journal.test.ts
+++ b/apps/stage-tamagotchi/src/renderer/stores/tools/builtin/image-journal.test.ts
@@ -1,7 +1,24 @@
 import { resolveArtistryConfigFromStore } from '@proj-airi/stage-ui/stores/modules/artistry'
-import { describe, expect, it } from 'vitest'
+import { describe, expect, it, vi } from 'vitest'
+
+import { installStrictToolSchemaMatchers } from '../testing/strict-tool-schema'
+
+installStrictToolSchemaMatchers()
 
 describe('image_journal config snapshot', () => {
+  it('uses required nullable fields for strict provider schemas', async () => {
+    vi.stubGlobal('window', {
+      location: {
+        origin: 'http://localhost',
+      },
+    })
+
+    const { imageJournalTools } = await import('./image-journal')
+    const tools = await imageJournalTools()
+
+    expect(tools).toSatisfyStrictToolSchemas()
+  })
+
   it('extracts plain values instead of leaking Ref objects', () => {
     const config = resolveArtistryConfigFromStore({
       activeProvider: { value: 'comfyui' },
diff --git a/apps/stage-tamagotchi/src/renderer/stores/tools/builtin/image-journal.ts b/apps/stage-tamagotchi/src/renderer/stores/tools/builtin/image-journal.ts
index 880b13648..307e40143 100644
--- a/apps/stage-tamagotchi/src/renderer/stores/tools/builtin/image-journal.ts
+++ b/apps/stage-tamagotchi/src/renderer/stores/tools/builtin/image-journal.ts
@@ -1,5 +1,6 @@
 import type { ResolvedArtistryConfig } from '@proj-airi/stage-ui/stores/modules/artistry'
 import type { Tool } from '@xsai/shared-chat'
+import type { JsonSchema } from 'xsschema'
 
 import { defineInvoke } from '@moeru/eventa'
 import { createContext } from '@moeru/eventa/adapters/electron/renderer'
@@ -7,8 +8,7 @@ import { artistryGenerateHeadless } from '@proj-airi/stage-shared'
 import { useBackgroundStore } from '@proj-airi/stage-ui/stores/background'
 import { useAiriCardStore } from '@proj-airi/stage-ui/stores/modules/airi-card'
 import { resolveArtistryConfigFromStore, useArtistryStore } from '@proj-airi/stage-ui/stores/modules/artistry'
-import { tool } from '@xsai/tool'
-import { z } from 'zod'
+import { rawTool } from '@xsai/tool'
 
 import { widgetsAdd } from '../../../../shared/eventa'
 
@@ -33,13 +33,41 @@ function getInvokers(): Invokers {
   return invokeCache
 }
 
-const imageJournalParams = z.object({
-  action: z.enum(['create', 'apply']).describe('Choose "create" to generate a new image, or "apply" to use an existing one.'),
-  prompt: z.string().optional().describe('Description for the image (required for "create").'),
-  title: z.string().optional().describe('Label for the entry (optional).'),
-  query: z.string().optional().describe('Search term for existing images (required for "apply").'),
-  mode: z.enum(['inline', 'widget', 'bg', 'bg_widget']).optional().describe('Display mode: "inline" (in chat), "widget" (overlay), "bg" (environment), or "bg_widget" (both). Defaults to character preference.'),
-})
+const imageJournalParams = {
+  type: 'object',
+  properties: {
+    action: {
+      type: 'string',
+      enum: ['create', 'apply'],
+      description: 'Choose "create" to generate a new image, or "apply" to use an existing one.',
+    },
+    prompt: {
+      type: ['string', 'null'],
+      description: 'Description for the image (required for "create").',
+    },
+    title: {
+      type: ['string', 'null'],
+      description: 'Label for the entry (optional).',
+    },
+    query: {
+      type: ['string', 'null'],
+      description: 'Search term for existing images (required for "apply").',
+    },
+    mode: {
+      type: ['string', 'null'],
+      enum: ['inline', 'widget', 'bg', 'bg_widget', null],
+      description: 'Display mode: "inline" (in chat), "widget" (overlay), "bg" (environment), or "bg_widget" (both). Defaults to character preference.',
+    },
+  },
+  required: [
+    'action',
+    'prompt',
+    'title',
+    'query',
+    'mode',
+  ],
+  additionalProperties: false,
+} satisfies JsonSchema
 
 async function executeCreateImageJournalEntry(params: { prompt?: string, title?: string, mode?: 'inline' | 'widget' | 'bg' | 'bg_widget' }) {
   if (!params.prompt?.trim())
@@ -199,12 +227,12 @@ async function executeImageJournalAction(params: any) {
 }
 
 const tools: Promise<Tool>[] = [
-  tool({
+  Promise.resolve(rawTool({
     name: 'image_journal',
     description: 'Manage AI-generated images. Use "create" to generate and display images. An optional "mode" (inline, widget, bg, bg_widget) can override the default character routing preference. Use "apply" to switch to an existing image from the journal.',
     execute: params => executeImageJournalAction(params),
     parameters: imageJournalParams,
-  }),
+  })),
 ]
 
 export const imageJournalTools = async () => Promise.all(tools)
diff --git a/apps/stage-tamagotchi/src/renderer/stores/tools/builtin/widgets.test.ts b/apps/stage-tamagotchi/src/renderer/stores/tools/builtin/widgets.test.ts
index d0b23e6b7..71910a74a 100644
--- a/apps/stage-tamagotchi/src/renderer/stores/tools/builtin/widgets.test.ts
+++ b/apps/stage-tamagotchi/src/renderer/stores/tools/builtin/widgets.test.ts
@@ -9,8 +9,11 @@ import { promisify } from 'node:util'
 import { beforeAll, describe, expect, it, vi } from 'vitest'
 
 import { canRenderExtensionUi, sanitizeExtensionUiRenderProps } from '../../../widgets/extension-ui/host'
+import { installStrictToolSchemaMatchers } from '../testing/strict-tool-schema'
 import { executeWidgetAction, normalizeComponentProps, widgetsTools } from './widgets'
 
+installStrictToolSchemaMatchers()
+
 const execFile = promisify(execFileCallback)
 const aihubmixApiKey = process.env.AIHUBMIX_API_KEY?.trim() || ''
 const hasAihubmixApiKey = Boolean(aihubmixApiKey)
@@ -221,6 +224,7 @@ describe('widgets tool helpers', () => {
       // nullable, then requires every nested key while allowing optional constraints to
       // be expressed as `number | null`. That preserves the runtime behavior while
       // satisfying strict tool validators that compare `required` against `properties`.
+      expect(stageWidgetsTool).toSatisfyStrictToolSchema()
       expect(windowSize).toBeDefined()
       expect(windowSize?.additionalProperties).toBe(false)
       expect(Object.keys(windowSize?.properties ?? {})).toEqual([
diff --git a/apps/stage-tamagotchi/src/renderer/stores/tools/testing/strict-tool-schema.test.ts b/apps/stage-tamagotchi/src/renderer/stores/tools/testing/strict-tool-schema.test.ts
new file mode 100644
index 000000000..6fb66f860
--- /dev/null
+++ b/apps/stage-tamagotchi/src/renderer/stores/tools/testing/strict-tool-schema.test.ts
@@ -0,0 +1,73 @@
+import type { Tool } from '@xsai/shared-chat'
+
+import { describe, expect, it } from 'vitest'
+
+import { installStrictToolSchemaMatchers } from './strict-tool-schema'
+
+installStrictToolSchemaMatchers()
+
+function createTool(parameters: unknown): Tool {
+  return {
+    type: 'function',
+    function: {
+      name: 'test_tool',
+      description: 'Test tool.',
+      parameters,
+    },
+  } as Tool
+}
+
+describe('strict tool schema matchers', () => {
+  /**
+   * @example
+   * expect(tool).toSatisfyStrictToolSchema()
+   */
+  it('accepts a strict provider-safe tool schema', () => {
+    const tool = createTool({
+      type: 'object',
+      properties: {
+        mode: {
+          type: ['string', 'null'],
+        },
+      },
+      required: ['mode'],
+      additionalProperties: false,
+    })
+
+    expect(tool).toSatisfyStrictToolSchema()
+  })
+
+  /**
+   * @example
+   * expect(() => expect(tool).toSatisfyStrictToolSchema()).toThrow(/mode/)
+   */
+  it('reports missing required keys with schema paths', () => {
+    const tool = createTool({
+      type: 'object',
+      properties: {
+        mode: {
+          type: ['string', 'null'],
+        },
+      },
+      required: [],
+      additionalProperties: false,
+    })
+
+    expect(() => expect(tool).toSatisfyStrictToolSchema()).toThrow(/test_tool\.parameters.*mode/)
+  })
+
+  /**
+   * @example
+   * expect([tool]).toSatisfyStrictToolSchemas()
+   */
+  it('checks a list of tools', () => {
+    const tool = createTool({
+      type: 'object',
+      properties: {},
+      required: [],
+      additionalProperties: false,
+    })
+
+    expect([tool]).toSatisfyStrictToolSchemas()
+  })
+})
diff --git a/apps/stage-tamagotchi/src/renderer/stores/tools/testing/strict-tool-schema.ts b/apps/stage-tamagotchi/src/renderer/stores/tools/testing/strict-tool-schema.ts
new file mode 100644
index 000000000..feb8e354d
--- /dev/null
+++ b/apps/stage-tamagotchi/src/renderer/stores/tools/testing/strict-tool-schema.ts
@@ -0,0 +1,144 @@
+import type { Tool } from '@xsai/shared-chat'
+import type { JsonSchema } from 'xsschema'
+
+import { expect } from 'vitest'
+
+interface StrictToolSchemaIssue {
+  path: string
+  message: string
+}
+
+declare module 'vitest' {
+  interface Assertion<T = any> {
+    toSatisfyStrictToolSchema: () => T
+    toSatisfyStrictToolSchemas: () => T
+  }
+  interface AsymmetricMatchersContaining {
+    toSatisfyStrictToolSchema: () => void
+    toSatisfyStrictToolSchemas: () => void
+  }
+}
+
+function isSchemaRecord(value: unknown): value is JsonSchema {
+  return Boolean(value && typeof value === 'object' && !Array.isArray(value))
+}
+
+function sorted(values: string[]): string[] {
+  return [...values].sort((left, right) => left.localeCompare(right))
+}
+
+function collectSchemaIssues(schema: unknown, path: string, issues: StrictToolSchemaIssue[]): void {
+  if (!isSchemaRecord(schema)) {
+    return
+  }
+
+  if (schema.properties) {
+    const propertyKeys = Object.keys(schema.properties)
+    const required = Array.isArray(schema.required) ? schema.required.filter((value): value is string => typeof value === 'string') : []
+
+    if (!Array.isArray(schema.required)) {
+      issues.push({
+        path,
+        message: '`required` must be supplied when `properties` is present.',
+      })
+    }
+    else if (sorted(required).join('\0') !== sorted(propertyKeys).join('\0')) {
+      const missing = propertyKeys.filter(key => !required.includes(key))
+      const extra = required.filter(key => !propertyKeys.includes(key))
+      issues.push({
+        path,
+        message: [
+          '`required` must include every key in `properties`.',
+          missing.length ? `Missing: ${missing.join(', ')}.` : '',
+          extra.length ? `Extra: ${extra.join(', ')}.` : '',
+        ].filter(Boolean).join(' '),
+      })
+    }
+
+    if (schema.additionalProperties !== false) {
+      issues.push({
+        path,
+        message: '`additionalProperties` must be false when `properties` is present.',
+      })
+    }
+
+    for (const [key, value] of Object.entries(schema.properties)) {
+      collectSchemaIssues(value, `${path}.${key}`, issues)
+    }
+  }
+
+  if (Array.isArray(schema.items)) {
+    schema.items.forEach((item, index) => collectSchemaIssues(item, `${path}.items[${index}]`, issues))
+  }
+  else if (schema.items) {
+    collectSchemaIssues(schema.items, `${path}.items`, issues)
+  }
+
+  for (const unionKey of ['anyOf', 'oneOf', 'allOf'] as const) {
+    const schemas = schema[unionKey]
+    if (Array.isArray(schemas)) {
+      schemas.forEach((item, index) => collectSchemaIssues(item, `${path}.${unionKey}[${index}]`, issues))
+    }
+  }
+}
+
+/**
+ * Collects strict provider schema issues from one xsAI tool.
+ *
+ * Use when:
+ * - Vitest checks need diagnostics instead of throwing immediately
+ * - A provider rejects schemas that omit `required` keys or allow extra object properties
+ *
+ * Expects:
+ * - `tool.function.parameters` contains the provider-facing JSON Schema
+ *
+ * Returns:
+ * - A list of path-qualified issues; empty means the schema satisfies the local strict rules
+ */
+export function collectStrictToolSchemaIssues(tool: Tool): StrictToolSchemaIssue[] {
+  const issues: StrictToolSchemaIssue[] = []
+  collectSchemaIssues(tool.function.parameters, `${tool.function.name}.parameters`, issues)
+  return issues
+}
+
+function formatIssues(issues: StrictToolSchemaIssue[]): string {
+  return issues.map(issue => `- ${issue.path}: ${issue.message}`).join('\n')
+}
+
+/**
+ * Installs Vitest matchers for strict provider-facing tool schema checks.
+ *
+ * Use when:
+ * - A test file wants `expect(tool).toSatisfyStrictToolSchema()`
+ * - A test file wants `expect(tools).toSatisfyStrictToolSchemas()`
+ *
+ * Expects:
+ * - Called before the matcher is used in the current Vitest worker
+ *
+ * Returns:
+ * - Registers matchers on Vitest's `expect` object
+ */
+export function installStrictToolSchemaMatchers(): void {
+  expect.extend({
+    toSatisfyStrictToolSchema(received: Tool) {
+      const issues = collectStrictToolSchemaIssues(received)
+
+      return {
+        pass: issues.length === 0,
+        message: () => issues.length
+          ? `Expected tool schema to satisfy strict provider rules:\n${formatIssues(issues)}`
+          : 'Expected tool schema not to satisfy strict provider rules.',
+      }
+    },
+    toSatisfyStrictToolSchemas(received: Tool[]) {
+      const issues = received.flatMap(tool => collectStrictToolSchemaIssues(tool))
+
+      return {
+        pass: issues.length === 0,
+        message: () => issues.length
+          ? `Expected tool schemas to satisfy strict provider rules:\n${formatIssues(issues)}`
+          : 'Expected tool schemas not to satisfy strict provider rules.',
+      }
+    },
+  })
+}
diff --git a/packages/core-agent/src/runtime/llm-service.test.ts b/packages/core-agent/src/runtime/llm-service.test.ts
new file mode 100644
index 000000000..0ccad508c
--- /dev/null
+++ b/packages/core-agent/src/runtime/llm-service.test.ts
@@ -0,0 +1,113 @@
+import type { ChatProvider } from '@xsai-ext/providers/utils'
+import type { Message, Tool } from '@xsai/shared-chat'
+
+import { describe, expect, it, vi } from 'vitest'
+
+import { streamFrom } from './llm-service'
+
+const { streamTextMock } = vi.hoisted(() => ({
+  streamTextMock: vi.fn(),
+}))
+
+vi.mock('@xsai/stream-text', () => ({
+  streamText: streamTextMock,
+}))
+
+vi.mock('@xsai/shared-chat', async (importOriginal) => {
+  const actual = await importOriginal<typeof import('@xsai/shared-chat')>()
+  return {
+    ...actual,
+    stepCountAtLeast: vi.fn(),
+  }
+})
+
+const provider = {
+  chat: () => ({
+    baseURL: 'https://example.com/',
+  }),
+} as unknown as ChatProvider
+
+function createMockStreamResult(steps: Promise<unknown[]> = Promise.resolve([])) {
+  return {
+    steps,
+    messages: Promise.resolve([]),
+    usage: Promise.resolve(undefined),
+    totalUsage: Promise.resolve(undefined),
+  }
+}
+
+describe('streamFrom tool error capture', () => {
+  /**
+   * @example
+   * await streamFrom({ model, chatProvider, messages, options: { captureToolErrors: true } })
+   */
+  it('keeps captureToolErrors internal while forwarding failed tool calls as tool-error events', async () => {
+    let resolveSteps: ((steps: unknown[]) => void) | undefined
+    const events: unknown[] = []
+    const failingTool = {
+      type: 'function',
+      function: {
+        name: 'play_chess',
+        description: 'Start chess.',
+        parameters: { type: 'object', properties: {} },
+      },
+      execute: vi.fn(() => {
+        throw new Error('Focus mode does not accept game-state mutation inputs.')
+      }),
+    } satisfies Tool
+
+    streamTextMock.mockImplementationOnce((options: {
+      captureToolErrors?: boolean
+      onEvent: (event: unknown) => Promise<void>
+      tools?: Tool[]
+    }) => {
+      const steps = new Promise<unknown[]>((resolve) => {
+        resolveSteps = resolve
+      })
+
+      queueMicrotask(async () => {
+        const result = await options.tools?.[0]?.execute({}, {
+          messages: [],
+          toolCallId: 'call-1',
+        })
+
+        await options.onEvent({
+          type: 'tool-result',
+          args: {},
+          result,
+          toolCallId: 'call-1',
+          toolName: 'play_chess',
+        })
+        await options.onEvent({ type: 'finish', finishReason: 'stop' })
+        resolveSteps?.([])
+      })
+
+      return createMockStreamResult(steps)
+    })
+
+    await streamFrom({
+      model: 'model-a',
+      chatProvider: provider,
+      messages: [{ role: 'user', content: 'play chess' }] as Message[],
+      options: {
+        captureToolErrors: true,
+        tools: [failingTool],
+        onStreamEvent: (event) => {
+          events.push(event)
+        },
+      },
+    })
+
+    const streamOptions = streamTextMock.mock.calls[0]?.[0]
+    expect(streamOptions.captureToolErrors).toBeUndefined()
+    expect(streamOptions.tools?.[0]).not.toBe(failingTool)
+    expect(failingTool.execute).toHaveBeenCalledTimes(1)
+    expect(events).toContainEqual(expect.objectContaining({
+      type: 'tool-error',
+      isError: true,
+      toolCallId: 'call-1',
+      toolName: 'play_chess',
+      result: expect.stringContaining('Focus mode does not accept game-state mutation inputs.'),
+    }))
+  })
+})
diff --git a/packages/core-agent/src/runtime/llm-service.ts b/packages/core-agent/src/runtime/llm-service.ts
index 4f288610f..992fb8221 100644
--- a/packages/core-agent/src/runtime/llm-service.ts
+++ b/packages/core-agent/src/runtime/llm-service.ts
@@ -1,8 +1,9 @@
 import type { ChatProvider } from '@xsai-ext/providers/utils'
-import type { Message } from '@xsai/shared-chat'
+import type { Message, Tool } from '@xsai/shared-chat'
 
 import type { StreamFromOptions, StreamOptions } from '../types/llm'
 
+import { errorMessageFrom } from '@moeru/std'
 import { stepCountAtLeast } from '@xsai/shared-chat'
 import { streamText } from '@xsai/stream-text'
 
@@ -46,6 +47,65 @@ async function resolveTools(options?: StreamOptions) {
   return tools ?? []
 }
 
+function isAbortError(error: unknown): boolean {
+  return typeof error === 'object'
+    && error !== null
+    && (error as { name?: unknown }).name === 'AbortError'
+}
+
+function createCapturedToolErrorResult(toolName: string, error: unknown): string {
+  return `Tool call error for "${toolName}": ${errorMessageFrom(error) ?? String(error)}`
+}
+
+function withCapturedToolErrors(
+  tools: Tool[],
+  capturedToolErrorByCallId: Map<string, string>,
+): Tool[] {
+  return tools.map(tool => ({
+    ...tool,
+    execute: async (input, executeOptions) => {
+      try {
+        return await tool.execute(input, executeOptions)
+      }
+      catch (error) {
+        if (isAbortError(error))
+          throw error
+
+        const result = createCapturedToolErrorResult(tool.function.name, error)
+        capturedToolErrorByCallId.set(executeOptions.toolCallId, result)
+        return result
+      }
+    },
+  }))
+}
+
+function resolveCapturedToolErrorEvent(
+  event: unknown,
+  capturedToolErrorByCallId: Map<string, string>,
+) {
+  if (
+    typeof event !== 'object'
+    || event === null
+    || (event as { type?: unknown }).type !== 'tool-result'
+    || typeof (event as { toolCallId?: unknown }).toolCallId !== 'string'
+  ) {
+    return event
+  }
+
+  const toolCallId = (event as { toolCallId: string }).toolCallId
+  const result = capturedToolErrorByCallId.get(toolCallId)
+  if (result == null)
+    return event
+
+  capturedToolErrorByCallId.delete(toolCallId)
+  return {
+    ...event,
+    type: 'tool-error',
+    isError: true,
+    result,
+  }
+}
+
 export async function streamFrom({
   model,
   chatProvider,
@@ -63,6 +123,10 @@ export async function streamFrom({
   const customTools = supportedTools ? await resolveTools(options) : []
   const mergedTools = supportedTools ? [...builtinTools, ...customTools] : []
   const tools = mergedTools.length > 0 ? mergedTools : undefined
+  const capturedToolErrorByCallId = new Map<string, string>()
+  const streamTools = options?.captureToolErrors && tools != null
+    ? withCapturedToolErrors(tools, capturedToolErrorByCallId)
+    : tools
 
   return new Promise<void>((resolve, reject) => {
     let settled = false
@@ -81,7 +145,8 @@ export async function streamFrom({
 
     const onEvent = async (event: unknown) => {
       try {
-        await options?.onStreamEvent?.(event as any)
+        const streamEvent = resolveCapturedToolErrorEvent(event, capturedToolErrorByCallId)
+        await options?.onStreamEvent?.(streamEvent as any)
         if (event && (event as any).type === 'finish') {
           const finishReason = (event as any).finishReason
           const waitingForToolRound = finishReason === 'tool_calls' || finishReason === 'tool-calls'
@@ -104,10 +169,12 @@ export async function streamFrom({
         messages: sanitized,
         headers: options?.headers,
         stopWhen: stepCountAtLeast(10),
-        tools,
-        // NOTICE: Some OpenAI-compatible gateways reject the wire-level
-        // `capture_tool_errors` parameter with 400 unknown_parameter.
-        // Keep this unset here so the request remains provider-compatible.
+        // NOTICE:
+        // Do not pass xsAI's `captureToolErrors` option here. In the installed
+        // @xsai/stream-text version, stream options are spread into the provider
+        // chat body, so unknown runtime-only fields can be rejected upstream.
+        // AIRI captures tool failures by wrapping local tool executors instead.
+        tools: streamTools,
         onEvent,
       })
 
diff --git a/packages/core-agent/src/types/llm.ts b/packages/core-agent/src/types/llm.ts
index 0df07eb5f..e61dccb04 100644
--- a/packages/core-agent/src/types/llm.ts
+++ b/packages/core-agent/src/types/llm.ts
@@ -16,6 +16,7 @@ export interface StreamOptions {
   toolsCompatibility?: Map<string, boolean>
   supportsTools?: boolean
   waitForTools?: boolean
+  captureToolErrors?: boolean
   tools?: Tool[] | (() => Promise<Tool[] | undefined>)
 }
 
diff --git a/packages/core-agent/vitest.config.ts b/packages/core-agent/vitest.config.ts
new file mode 100644
index 000000000..464fcb4d5
--- /dev/null
+++ b/packages/core-agent/vitest.config.ts
@@ -0,0 +1,8 @@
+import { defineConfig } from 'vitest/config'
+
+export default defineConfig({
+  test: {
+    name: '@proj-airi/core-agent',
+    include: ['src/**/*.test.ts'],
+  },
+})
diff --git a/packages/stage-ui/src/stores/chat.contract.test.ts b/packages/stage-ui/src/stores/chat.contract.test.ts
index f8abb03ee..6326ddec9 100644
--- a/packages/stage-ui/src/stores/chat.contract.test.ts
+++ b/packages/stage-ui/src/stores/chat.contract.test.ts
@@ -7,6 +7,14 @@ import { ref } from 'vue'
 
 import { useChatOrchestratorStore } from './chat'
 
+vi.hoisted(() => {
+  ;(globalThis as any).window = {
+    location: {
+      origin: 'http://localhost',
+    },
+  }
+})
+
 const llmStreamMock = vi.fn()
 const trackFirstMessageMock = vi.fn()
 const ingestContextMessageMock = vi.fn()
@@ -147,6 +155,18 @@ vi.mock('./modules/consciousness', () => ({
   }),
 }))
 
+vi.mock('./modules/airi-card', () => ({
+  useAiriCardStore: () => ({
+    activeCard: undefined,
+  }),
+}))
+
+vi.mock('./modules/artistry-autonomous', () => ({
+  useAutonomousArtistryStore: () => ({
+    runArtistTask: vi.fn(),
+  }),
+}))
+
 const provider = {
   chat: () => ({ baseURL: 'https://example.com/' }),
 } as unknown as ChatProvider
@@ -195,6 +215,7 @@ describe('chat orchestrator contract', () => {
     llmStreamMock.mockImplementation(async (_model: string, _chatProvider: ChatProvider, messages: Message[], options: any) => {
       composedMessages = messages
       expect(options.waitForTools).toBe(true)
+      expect(options.captureToolErrors).toBe(true)
 
       await options.onStreamEvent({ type: 'text-delta', text: 'hello' })
       await options.onStreamEvent({ type: 'finish', finishReason: 'stop' })
diff --git a/packages/stage-ui/src/stores/chat.ts b/packages/stage-ui/src/stores/chat.ts
index fb955d724..b559e3154 100644
--- a/packages/stage-ui/src/stores/chat.ts
+++ b/packages/stage-ui/src/stores/chat.ts
@@ -438,6 +438,7 @@ export const useChatOrchestratorStore = defineStore('chat-orchestrator', () => {
           // NOTICE: xsai stream may emit `finish` before tool steps continue, so keep waiting until
           // the final non-tool finish to avoid ending the chat turn with no assistant reply.
           waitForTools: true,
+          captureToolErrors: true,
           onStreamEvent: async (event: StreamEvent) => {
             switch (event.type) {
               case 'tool-call':