diff --git a/frontend/src/i18n/locales/en.json b/frontend/src/i18n/locales/en.json
index 93cc27a60..895e378fc 100644
--- a/frontend/src/i18n/locales/en.json
+++ b/frontend/src/i18n/locales/en.json
@@ -2730,6 +2730,20 @@
     "reasonUpstreamToolError": "the provider tool returned an error",
     "reasonBrokerUnavailable": "the broker was unavailable",
     "reasonBrokerError": "the broker failed",
+    "reasonToolDrift": "the provider changed this tool since Commonly checked it",
+    "reasonToolUnavailable": "this connection's tool list does not include this tool",
+    "reasonToolNotFound": "this tool is not registered with Commonly",
+    "reasonToolChangedSinceApproval": "the tool changed after approval was asked for, so it needs asking again",
+    "reasonArgsChangedSinceApproval": "the arguments no longer match the ones sent for approval",
+    "reasonRepoChangedSinceApproval": "the connected repository changed after approval was asked for",
+    "reasonPrChangedSinceApproval": "the pull request changed after approval was asked for",
+    "reasonPrHeadUnavailable": "the pull request's latest commit could not be read",
+    "reasonTaskPodMismatch": "this grant works only in its task's pod",
+    "reasonTaskClaimRequired": "the agent has to claim the bound task first",
+    "reasonTaskClosed": "the bound task closed after this grant was issued",
+    "reasonTaskNotFound": "the bound task no longer exists",
+    "reasonAgentIdentityRequired": "the call did not say which agent made it",
+    "reasonGrantNotFound": "the grant no longer exists",
     "owner": "owner",
     "readInTesting": "read in testing",
     "readOrWrite": "read, or read and write",
diff --git a/frontend/src/i18n/locales/zh-CN.json b/frontend/src/i18n/locales/zh-CN.json
index 595f37c7e..cf87a12ec 100644
--- a/frontend/src/i18n/locales/zh-CN.json
+++ b/frontend/src/i18n/locales/zh-CN.json
@@ -2733,6 +2733,20 @@
     "reasonUpstreamToolError": "服务商工具返回了错误",
     "reasonBrokerUnavailable": "代理服务不可用",
     "reasonBrokerError": "代理服务出错",
+    "reasonToolDrift": "服务商在 Commonly 核对后改动了此工具",
+    "reasonToolUnavailable": "此连接的工具列表中没有这个工具",
+    "reasonToolNotFound": "此工具未在 Commonly 中注册",
+    "reasonToolChangedSinceApproval": "工具在申请审批后有变动，需要重新审批",
+    "reasonArgsChangedSinceApproval": "参数与提交审批时的不一致",
+    "reasonRepoChangedSinceApproval": "连接的仓库在申请审批后有变动",
+    "reasonPrChangedSinceApproval": "PR 在申请审批后有变动",
+    "reasonPrHeadUnavailable": "无法读取 PR 的最新提交",
+    "reasonTaskPodMismatch": "此授权只能在其任务所在的 Pod 中使用",
+    "reasonTaskClaimRequired": "智能体需要先认领绑定的任务",
+    "reasonTaskClosed": "绑定的任务在授权签发后关闭过",
+    "reasonTaskNotFound": "绑定的任务已不存在",
+    "reasonAgentIdentityRequired": "调用没有说明是哪个智能体发起的",
+    "reasonGrantNotFound": "授权已不存在",
     "owner": "所有者",
     "readInTesting": "只读功能测试中",
     "readOrWrite": "读取，或读取和写入",
diff --git a/frontend/src/v2/__tests__/ConnectorsPage.tools.test.tsx b/frontend/src/v2/__tests__/ConnectorsPage.tools.test.tsx
index 068195762..7ab653dd2 100644
--- a/frontend/src/v2/__tests__/ConnectorsPage.tools.test.tsx
+++ b/frontend/src/v2/__tests__/ConnectorsPage.tools.test.tsx
@@ -428,6 +428,49 @@ describe('Connectors page: tools', () => {
     ]);
   });
 
+  // The broker records any refusal it throws as the line's reason, and these were
+  // shown as raw codes: a hosted tool that drifted, an approved call whose PR or
+  // arguments moved, a task-bound grant used off its task (F18, 11-02 prod walk).
+  // Every code is listed, so dropping any one label turns this red.
+  const REFUSAL_LABELS = [
+    ['tool_drift', 'the provider changed this tool since Commonly checked it', '服务商在 Commonly 核对后改动了此工具'],
+    ['tool_unavailable', 'this connection\'s tool list does not include this tool', '此连接的工具列表中没有这个工具'],
+    ['tool_not_found', 'this tool is not registered with Commonly', '此工具未在 Commonly 中注册'],
+    ['definition_digest_mismatch', 'the tool changed after approval was asked for, so it needs asking again', '工具在申请审批后有变动，需要重新审批'],
+    ['args_digest_mismatch', 'the arguments no longer match the ones sent for approval', '参数与提交审批时的不一致'],
+    ['repo_mismatch', 'the connected repository changed after approval was asked for', '连接的仓库在申请审批后有变动'],
+    ['merge_head_mismatch', 'the pull request changed after approval was asked for', 'PR 在申请审批后有变动'],
+    ['merge_head_unavailable', 'the pull request\'s latest commit could not be read', '无法读取 PR 的最新提交'],
+    ['task_pod_mismatch', 'this grant works only in its task\'s pod', '此授权只能在其任务所在的 Pod 中使用'],
+    ['task_claim_required', 'the agent has to claim the bound task first', '智能体需要先认领绑定的任务'],
+    ['task_closed', 'the bound task closed after this grant was issued', '绑定的任务在授权签发后关闭过'],
+    ['task_not_found', 'the bound task no longer exists', '绑定的任务已不存在'],
+    ['agent_identity_required', 'the call did not say which agent made it', '调用没有说明是哪个智能体发起的'],
+    ['grant_not_found', 'the grant no longer exists', '授权已不存在'],
+  ];
+  it.each([['en', 1], ['zh-CN', 2]])('F18: every refusal the broker records reads as words, in %s', async (language, column) => {
+    await i18nReady;
+    await act(async () => { await i18n.changeLanguage(language); });
+    try {
+      const refused = {
+        ...trail,
+        calls: REFUSAL_LABELS.map(([reason], i) => (
+          { ...trail.calls[0], callId: `r${i}`, outcome: 'refused', reason, at: iso(-60000 * (i + 1)) }
+        )),
+      };
+      mockTools({ trails: { grant_live: refused } });
+      renderPage();
+      const drawer = await openTool('GitHub');
+      fireEvent.click(drawer.querySelector('.v2-connector-row__selection'));
+      const aside = await screen.findByRole('complementary');
+      await waitFor(() => expect(within(aside).getAllByRole('listitem')).toHaveLength(REFUSAL_LABELS.length));
+      expect(Array.from(aside.querySelectorAll('.v2-tools__trail-reason')).map((node) => node.textContent))
+        .toEqual(REFUSAL_LABELS.map((row) => ` · ${row[column]}`));
+    } finally {
+      await act(async () => { await i18n.changeLanguage('en'); });
+    }
+  });
+
   it('TASK-050: a human member in the audience is named, not called "an agent"', async () => {
     mockTools({ grants: [{ ...grantLive, effectiveAudience: ['u1', 'a1'] }], seats: { p1: [scout] } });
     renderPage();
diff --git a/frontend/src/v2/connectors/useToolConnectors.ts b/frontend/src/v2/connectors/useToolConnectors.ts
index 1d0bee736..50a957f9b 100644
--- a/frontend/src/v2/connectors/useToolConnectors.ts
+++ b/frontend/src/v2/connectors/useToolConnectors.ts
@@ -251,6 +251,20 @@ export const useToolConnectors = (
       upstream_tool_error: t('tools.reasonUpstreamToolError', { defaultValue: 'the provider tool returned an error' }),
       broker_unavailable: t('tools.reasonBrokerUnavailable', { defaultValue: 'the broker was unavailable' }),
       broker_error: t('tools.reasonBrokerError', { defaultValue: 'the broker failed' }),
+      tool_drift: t('tools.reasonToolDrift', { defaultValue: 'the provider changed this tool since Commonly checked it' }),
+      tool_unavailable: t('tools.reasonToolUnavailable', { defaultValue: "this connection's tool list does not include this tool" }),
+      tool_not_found: t('tools.reasonToolNotFound', { defaultValue: 'this tool is not registered with Commonly' }),
+      definition_digest_mismatch: t('tools.reasonToolChangedSinceApproval', { defaultValue: 'the tool changed after approval was asked for, so it needs asking again' }),
+      args_digest_mismatch: t('tools.reasonArgsChangedSinceApproval', { defaultValue: 'the arguments no longer match the ones sent for approval' }),
+      repo_mismatch: t('tools.reasonRepoChangedSinceApproval', { defaultValue: 'the connected repository changed after approval was asked for' }),
+      merge_head_mismatch: t('tools.reasonPrChangedSinceApproval', { defaultValue: 'the pull request changed after approval was asked for' }),
+      merge_head_unavailable: t('tools.reasonPrHeadUnavailable', { defaultValue: 'the pull request\'s latest commit could not be read' }),
+      task_pod_mismatch: t('tools.reasonTaskPodMismatch', { defaultValue: 'this grant works only in its task\'s pod' }),
+      task_claim_required: t('tools.reasonTaskClaimRequired', { defaultValue: 'the agent has to claim the bound task first' }),
+      task_closed: t('tools.reasonTaskClosed', { defaultValue: 'the bound task closed after this grant was issued' }),
+      task_not_found: t('tools.reasonTaskNotFound', { defaultValue: 'the bound task no longer exists' }),
+      agent_identity_required: t('tools.reasonAgentIdentityRequired', { defaultValue: 'the call did not say which agent made it' }),
+      grant_not_found: t('tools.reasonGrantNotFound', { defaultValue: 'the grant no longer exists' }),
     };
     // Own keys only: a code such as `constructor` or `__proto__` must show as itself, not as an inherited member.
     return Object.prototype.hasOwnProperty.call(labels, reason) ? labels[reason] : reason;