diff --git a/apps/cli/tests/profiles/headless/tests/ptc.e2e.ts b/apps/cli/tests/profiles/headless/tests/ptc.e2e.ts
index 35c3e974bd..a623855811 100644
--- a/apps/cli/tests/profiles/headless/tests/ptc.e2e.ts
+++ b/apps/cli/tests/profiles/headless/tests/ptc.e2e.ts
@@ -212,7 +212,7 @@ describe('PTC mode typed values: keyless real-process contracts', () => {
       });
       return started.jobId;
     `))
-    expect(jobId).toMatch(/^bash-[0-9a-f-]{36}$/)
+    expect(jobId).toMatch(/^bash-[0-9a-f]{16}$/)
 
     const polled = completion(await runCode(ctx, `
       return await tools.job_output({ job_id: ${JSON.stringify(jobId)}, wait: true, timeout_ms: 5000 });
@@ -258,7 +258,7 @@ describe('PTC mode typed values: keyless real-process contracts', () => {
     ])
     const job = ctx.jobs.list()[0]
     expect(job).toMatchObject({ status: 'running' })
-    expect(job?.id).toMatch(/^bash-[0-9a-f-]{36}$/)
+    expect(job?.id).toMatch(/^bash-[0-9a-f]{16}$/)
     afterPublication.abort('outer-call-cancelled')
     expect((await running).isError).toBe(true)
     expect(ctx.jobs.list()[0]).toMatchObject({ id: job!.id, status: 'running' })
diff --git a/apps/web/tests/background-job-list.e2e.ts b/apps/web/tests/background-job-list.e2e.ts
index 8647ec76b0..f407bdb53e 100644
--- a/apps/web/tests/background-job-list.e2e.ts
+++ b/apps/web/tests/background-job-list.e2e.ts
@@ -95,7 +95,7 @@ describe.skipIf(MODE === 'record')('web e2e: background job list', () => {
       agent,
     })
     const reported = started.content.map(block => block.type === 'text' ? block.text : '').join('')
-    const matched = /\bbash-[0-9a-f]{8}(?:-[0-9a-f]{4}){3}-[0-9a-f]{12}\b/.exec(reported)
+    const matched = /\bbash-[0-9a-f]{16}\b/.exec(reported)
     if (matched === null) throw new Error(`background bash reported no job id: ${reported}`)
     const jobId = JobId(matched[0])
 
diff --git a/apps/web/tests/live-job-stream.e2e.ts b/apps/web/tests/live-job-stream.e2e.ts
index 3c15589471..2b4fb64d68 100644
--- a/apps/web/tests/live-job-stream.e2e.ts
+++ b/apps/web/tests/live-job-stream.e2e.ts
@@ -95,7 +95,7 @@ describe.skipIf(MODE === 'record')('web e2e: live job stream', () => {
       agent,
     })
     const reported = started.content.map(block => block.type === 'text' ? block.text : '').join('')
-    const matched = /\bbash-[0-9a-f]{8}(?:-[0-9a-f]{4}){3}-[0-9a-f]{12}\b/.exec(reported)
+    const matched = /\bbash-[0-9a-f]{16}\b/.exec(reported)
     if (matched === null) throw new Error(`background bash reported no job id: ${reported}`)
     const jobId = JobId(matched[0])
 
diff --git a/apps/web/tests/scaffold.ts b/apps/web/tests/scaffold.ts
index 8009cf4453..c9a52ebbe0 100644
--- a/apps/web/tests/scaffold.ts
+++ b/apps/web/tests/scaffold.ts
@@ -1545,6 +1545,7 @@ function normalizeAria(snapshot: string, workspaceCwd: string, age: boolean): st
     .split(workspaceCwd).join('{{cwd}}')
     .split(base).join('{{workspace}}')
     .replace(/[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}/gi, '{{uuid}}')
+    .replace(/(?<=-)[0-9a-f]{16}(?![0-9a-f])/gi, '{{uuid}}')
     // The optional space in `\d+m ?\d+s` covers both minute spellings: the
     // stats line's compact `2m42s` and the message-chrome template's `2m 42s`.
     .replace(
diff --git a/apps/web/tests/shipped-composition.e2e.ts b/apps/web/tests/shipped-composition.e2e.ts
index 88adae1129..9c7d827aba 100644
--- a/apps/web/tests/shipped-composition.e2e.ts
+++ b/apps/web/tests/shipped-composition.e2e.ts
@@ -690,7 +690,7 @@ it('lets a preset producer reach the background-job registry', async () => {
       agent: handle.agent,
     })
     const reported = started.content.map(block => block.type === 'text' ? block.text : '').join('')
-    const matched = /^started background job (bash-[0-9a-f]{8}(?:-[0-9a-f]{4}){3}-[0-9a-f]{12})$/.exec(reported)
+    const matched = /^started background job (bash-[0-9a-f]{16})$/.exec(reported)
     if (matched === null) throw new Error(`background bash reported no job id: ${reported}`)
     const jobId = matched[1]
     expect({ isError: started.isError, content: started.content }).toEqual({
diff --git a/docs/subsystems/jobs.i18n.yaml b/docs/subsystems/jobs.i18n.yaml
index 00861e6f06..65fe615ce8 100644
--- a/docs/subsystems/jobs.i18n.yaml
+++ b/docs/subsystems/jobs.i18n.yaml
@@ -6,8 +6,8 @@
   en: dd515d8548864a91
   zh: 16a117d39989a373
 /background-job-runtime/ids-and-status:
-  en: 3cb96fdb6ae34bd2
-  zh: 7c85929b455f9431
+  en: 4b286c70e4a83b99
+  zh: 7edbf090e9cb6487
 /background-job-runtime/session-lifecycle-records:
   en: 1b6b65e4c2983518
   zh: 12bd4c7158d5e55e
diff --git a/docs/subsystems/jobs.md b/docs/subsystems/jobs.md
index 05d01cf75e..08586d5143 100644
--- a/docs/subsystems/jobs.md
+++ b/docs/subsystems/jobs.md
@@ -6,7 +6,7 @@ Types shared by long-running producers, `ctx.jobs`, and job controls. The [seam
 
 ## Ids and status
 
-`JobId` is a [branded id](core.md#branded-ids) generated as `<kind>-<uuid>`. Access control relies on owner authorization, not id secrecy. `JobKind` derives from a merge-extensible map; the registry treats kinds as opaque id namespaces.
+`JobId` is a [branded id](core.md#branded-ids) generated as `<kind>-<short-uuid>` with 16 lowercase UUID hex characters after the kind. Access control relies on owner authorization, not id secrecy. `JobKind` derives from a merge-extensible map; the registry treats kinds as opaque id namespaces.
 
 ```ts type-equiv
 /**
@@ -130,7 +130,7 @@ interface JobSpec {
  * throwing, so a producer's trailing flush cannot break its own teardown path.
  */
 interface JobHandle {
-  /** The registry-issued id (`<kind>-<uuid>`). */
+  /** The registry-issued id (`<kind>-<short-uuid>`). */
   readonly id: JobId
   /**
    * Append one chunk to the output ring. Offsets advance by the chunk's UTF-8
@@ -273,7 +273,7 @@ interface JobOutputRead {
  * stream all consume this one shape.
  */
 interface JobView {
-  /** The registry-issued id (`<kind>-<uuid>`). */
+  /** The registry-issued id (`<kind>-<short-uuid>`). */
   readonly id: JobId
   /**
    * The producer kind the job was registered with: a Host-registered
@@ -459,7 +459,7 @@ Implementations must honor these semantics:
  * rejection leaves no job id or execution resource. A throwing starter
  * leaves nothing registered; after it returns, registration cannot fail.
  * @param spec - job identity, owner, output sources, and synchronous starter.
- * @returns the registry-issued `<kind>-<uuid>` id.
+ * @returns the registry-issued `<kind>-<short-uuid>` id.
  */
 abstract start(spec: JobSpec): JobId
 
diff --git a/docs/subsystems/jobs.zh.md b/docs/subsystems/jobs.zh.md
index a55b25b484..0096f6d093 100644
--- a/docs/subsystems/jobs.zh.md
+++ b/docs/subsystems/jobs.zh.md
@@ -6,7 +6,7 @@
 
 ## ID 与状态
 
-`JobId` 是按 `<kind>-<uuid>` 生成的[品牌化 id](core.zh.md#branded-ids)。访问控制依赖拥有者授权，而非 id 的保密性。`JobKind` 派生自可合并扩展的 map；注册表将各个 kind 视为不透明的 id 命名空间。
+`JobId` 是按 `<kind>-<short-uuid>` 生成的[品牌化 id](core.zh.md#branded-ids)，kind 后是 UUID 的 16 位小写十六进制字符。访问控制依赖拥有者授权，而非 id 的保密性。`JobKind` 派生自可合并扩展的 map；注册表将各个 kind 视为不透明的 id 命名空间。
 
 ```ts type-equiv
 /**
@@ -130,7 +130,7 @@ interface JobSpec {
  * throwing, so a producer's trailing flush cannot break its own teardown path.
  */
 interface JobHandle {
-  /** The registry-issued id (`<kind>-<uuid>`). */
+  /** The registry-issued id (`<kind>-<short-uuid>`). */
   readonly id: JobId
   /**
    * Append one chunk to the output ring. Offsets advance by the chunk's UTF-8
@@ -273,7 +273,7 @@ interface JobOutputRead {
  * stream all consume this one shape.
  */
 interface JobView {
-  /** The registry-issued id (`<kind>-<uuid>`). */
+  /** The registry-issued id (`<kind>-<short-uuid>`). */
   readonly id: JobId
   /**
    * The producer kind the job was registered with: a Host-registered
@@ -459,7 +459,7 @@ Implementations must honor these semantics:
  * rejection leaves no job id or execution resource. A throwing starter
  * leaves nothing registered; after it returns, registration cannot fail.
  * @param spec - job identity, owner, output sources, and synchronous starter.
- * @returns the registry-issued `<kind>-<uuid>` id.
+ * @returns the registry-issued `<kind>-<short-uuid>` id.
  */
 abstract start(spec: JobSpec): JobId
 
diff --git a/docs/upgrade-guide/v0.2.1-alpha.1/job-id-identity/guide.i18n.yaml b/docs/upgrade-guide/v0.2.1-alpha.1/job-id-identity/guide.i18n.yaml
index d5fc8af6f3..09f6fb75d4 100644
--- a/docs/upgrade-guide/v0.2.1-alpha.1/job-id-identity/guide.i18n.yaml
+++ b/docs/upgrade-guide/v0.2.1-alpha.1/job-id-identity/guide.i18n.yaml
@@ -9,8 +9,8 @@
   en: 9b06780be69e93f6
   zh: c33945fd584c6a23
 /background-job-ids-identify-one-execution/change:
-  en: 93ae25c874b916b9
-  zh: 38dee1fc3edd2873
+  en: 047ec9d0337bfc0b
+  zh: 1218472855e81189
 /background-job-ids-identify-one-execution/migration:
   en: c5ec322772f41799
   zh: 8e9f27d749995be2
diff --git a/docs/upgrade-guide/v0.2.1-alpha.1/job-id-identity/guide.md b/docs/upgrade-guide/v0.2.1-alpha.1/job-id-identity/guide.md
index 2ff0d63d42..b8c1e3233e 100644
--- a/docs/upgrade-guide/v0.2.1-alpha.1/job-id-identity/guide.md
+++ b/docs/upgrade-guide/v0.2.1-alpha.1/job-id-identity/guide.md
@@ -9,7 +9,7 @@ English | [中文](guide.zh.md)
 
 ## Change
 
-The job registry returns `<kind>-<uuid>` instead of `<kind>-N`. The same `JobId` appears in live controls, `job/registered`, and `job/settled`; lifecycle records no longer carry `executionId`. The identifier remains owner-authorized. Existing Session histories remain unchanged and do not resume their jobs.
+The job registry returns `<kind>-<short-uuid>` instead of `<kind>-N`; the suffix is 16 lowercase UUID hex characters. The same `JobId` appears in live controls, `job/registered`, and `job/settled`; lifecycle records no longer carry `executionId`. The identifier remains owner-authorized. Existing Session histories remain unchanged and do not resume their jobs.
 
 ## Migration
 
diff --git a/docs/upgrade-guide/v0.2.1-alpha.1/job-id-identity/guide.zh.md b/docs/upgrade-guide/v0.2.1-alpha.1/job-id-identity/guide.zh.md
index 0e313ecb98..a862df0aa2 100644
--- a/docs/upgrade-guide/v0.2.1-alpha.1/job-id-identity/guide.zh.md
+++ b/docs/upgrade-guide/v0.2.1-alpha.1/job-id-identity/guide.zh.md
@@ -9,7 +9,7 @@ description: "JobId 现在跨注册表生命周期标识一次后台执行。"
 
 ## 变更
 
-job 注册表返回 `<kind>-<uuid>`，不再返回 `<kind>-N`。运行期控制、`job/registered` 和 `job/settled` 使用同一个 `JobId`；生命周期记录不再携带 `executionId`。访问仍按所有者授权。已有 Session 历史保持原样，不会恢复其中的 job。
+job 注册表返回 `<kind>-<short-uuid>`，不再返回 `<kind>-N`；后缀是 UUID 的 16 位小写十六进制字符。运行期控制、`job/registered` 和 `job/settled` 使用同一个 `JobId`；生命周期记录不再携带 `executionId`。访问仍按所有者授权。已有 Session 历史保持原样，不会恢复其中的 job。
 
 ## 迁移
 
diff --git a/packages/experimental/tool-terminal/src/index.ts b/packages/experimental/tool-terminal/src/index.ts
index b070b5ef40..f966141c8b 100644
--- a/packages/experimental/tool-terminal/src/index.ts
+++ b/packages/experimental/tool-terminal/src/index.ts
@@ -145,13 +145,6 @@ function sendDetail(result: TerminalSendResult): string {
     : `session exited: ${result.sessionStatus.exitCode ?? result.sessionStatus.signal ?? 'unknown'}`
 }
 
-function renderBackgroundJobId(jobId: string, maxBytes: number): string {
-  const acknowledgement = `started background job ${jobId}`
-  return Buffer.byteLength(acknowledgement) <= maxBytes
-    ? acknowledgement
-    : `started job ${jobId}`
-}
-
 /** Register all terminal tools and the minimal usage guidance. */
 export function apply(ctx: Context, config: Config = {}): void {
   const enableRunInBackground = config.enableRunInBackground ?? true
@@ -243,7 +236,7 @@ export function apply(ctx: Context, config: Config = {}): void {
       render: (_args, value) => [{
         type: 'text',
         text: value.kind === 'background'
-          ? renderBackgroundJobId(value.jobId, maxResultBytes)
+          ? `started background job ${value.jobId}`
           : renderSend(value, maxResultBytes),
       }],
       presentationMeta: (_args, value) => value.kind === 'foreground'
diff --git a/packages/experimental/tool-terminal/tests/tools.spec.ts b/packages/experimental/tool-terminal/tests/tools.spec.ts
index 2039871876..fcc0a10405 100644
--- a/packages/experimental/tool-terminal/tests/tools.spec.ts
+++ b/packages/experimental/tool-terminal/tests/tools.spec.ts
@@ -146,7 +146,7 @@ function backgroundJobId(result: Awaited<ReturnType<typeof call>>): string {
   if (typeof value !== 'object' || value === null || !('jobId' in value) || typeof value.jobId !== 'string') {
     throw new Error('missing background job id')
   }
-  expect(value.jobId).toMatch(/^pty-send-[0-9a-f-]{36}$/)
+  expect(value.jobId).toMatch(/^pty-send-[0-9a-f]{16}$/)
   return value.jobId
 }
 
@@ -355,7 +355,7 @@ describe('tool-terminal foreground API', () => {
     const background = await call(ctx, 'terminal_send', {
       sessionId: 'pty-1', text: 'work', run_in_background: true,
     }, agent)
-    expect(text(background)).toBe(`started job ${backgroundJobId(background)}`)
+    expect(text(background)).toBe(`started background job ${backgroundJobId(background)}`)
     expect(Buffer.byteLength(text(background))).toBeLessThanOrEqual(64)
   })
 
diff --git a/packages/extensions/tool-cordis/src/api-catalog.ts b/packages/extensions/tool-cordis/src/api-catalog.ts
index df2e8c353b..044e4a334c 100644
--- a/packages/extensions/tool-cordis/src/api-catalog.ts
+++ b/packages/extensions/tool-cordis/src/api-catalog.ts
@@ -1353,7 +1353,7 @@ export const SERVICE_API: readonly ServiceApiEntry[] = [
         signature: 'abstract start(spec: JobSpec): JobId',
         description: 'Preflight access, validation, owner cleanup, and implementation-owned admission before starting and atomically registering work. Any preflight rejection leaves no job id or execution resource. A throwing starter leaves nothing registered; after it returns, registration cannot fail.',
         parameters: [{ name: 'spec', description: 'job identity, owner, output sources, and synchronous starter.' }],
-        returns: 'the registry-issued `<kind>-<uuid>` id.',
+        returns: 'the registry-issued `<kind>-<short-uuid>` id.',
       },
       {
         signature: 'abstract list(caller?: SessionId): JobView[]',
diff --git a/packages/jobs/jobs-local/src/index.ts b/packages/jobs/jobs-local/src/index.ts
index 214a9989ab..daa4ce0db3 100644
--- a/packages/jobs/jobs-local/src/index.ts
+++ b/packages/jobs/jobs-local/src/index.ts
@@ -224,8 +224,12 @@ export class LocalJobRegistry extends JobRegistry {
       )
     }
 
-    // The producer uses the same identity as controls and durable lifecycle records.
-    const id = JobId(`${spec.kind}-${randomUUID()}`)
+    // The producer uses the same short UUID identity as controls and durable lifecycle records.
+    // Retry a collision while this registry still holds an earlier id.
+    let id: JobId
+    do {
+      id = JobId(`${spec.kind}-${randomUUID().replaceAll('-', '').slice(0, 16)}`)
+    } while (this.store.has(id))
     const toolCall = spec.toolCall === undefined ? undefined : { ...spec.toolCall }
     const ring = new OutputRing()
     const state: ProducerState = { progress: undefined, job: undefined }
diff --git a/packages/jobs/jobs-local/tests/jobs.spec.ts b/packages/jobs/jobs-local/tests/jobs.spec.ts
index eba365895b..538c956140 100644
--- a/packages/jobs/jobs-local/tests/jobs.spec.ts
+++ b/packages/jobs/jobs-local/tests/jobs.spec.ts
@@ -1,3 +1,4 @@
+import { randomUUID } from 'node:crypto'
 import { afterEach, beforeEach, describe, expect, expectTypeOf, it, vi } from 'vitest'
 import { Context } from '@deepseek-ai/cordis'
 import { Session, SessionId } from '@deepseek-ai/dsh-session'
@@ -14,6 +15,13 @@ import type {
 import LocalJobRegistry, { type Config as JobsConfig } from '@deepseek-ai/dsh-jobs-local'
 import { unsupportedInbox } from '@deepseek-ai/dsh-agent-loop-testkit'
 
+vi.mock('node:crypto', async (importOriginal) => {
+  const actual = await importOriginal<typeof import('node:crypto')>()
+  return { ...actual, randomUUID: vi.fn(actual.randomUUID) }
+})
+
+const randomUuid = vi.mocked(randomUUID)
+
 declare module '@deepseek-ai/dsh-jobs' {
   interface JobKindMap {
     'test-task': 'test-task'
@@ -249,7 +257,7 @@ describe('LocalJobRegistry.start', () => {
   it('rejects before producer start and id allocation, then admits immediately after settlement', async () => {
     const ctx = await harness({ maxConcurrentJobsPerOwner: 1 })
     const first = producer()
-    expect(ctx.jobs.start(first.spec)).toMatch(/^bash-[0-9a-f-]{36}$/)
+    expect(ctx.jobs.start(first.spec)).toMatch(/^bash-[0-9a-f]{16}$/)
 
     const blocked = producer()
     const run = vi.fn((job: JobHandle) => blocked.spec.run(job))
@@ -259,7 +267,7 @@ describe('LocalJobRegistry.start', () => {
 
     first.settle({ status: 'completed' })
     await tick()
-    expect(ctx.jobs.start(blocked.spec)).toMatch(/^bash-[0-9a-f-]{36}$/)
+    expect(ctx.jobs.start(blocked.spec)).toMatch(/^bash-[0-9a-f]{16}$/)
   })
 
   it('keeps a stopping job in the bucket until producer settlement', async () => {
@@ -273,7 +281,7 @@ describe('LocalJobRegistry.start', () => {
 
     first.settle({ status: 'killed' })
     await tick()
-    expect(ctx.jobs.start(replacement.spec)).toMatch(/^bash-[0-9a-f-]{36}$/)
+    expect(ctx.jobs.start(replacement.spec)).toMatch(/^bash-[0-9a-f]{16}$/)
   })
 
   it.each(['completed', 'killed', 'failed'] as const)(
@@ -315,10 +323,30 @@ describe('LocalJobRegistry.start', () => {
 
   it('issues unique kind-prefixed ids', async () => {
     const ctx = await harness()
-    expect(ctx.jobs.start(producer().spec)).toMatch(/^bash-[0-9a-f-]{36}$/)
-    expect(ctx.jobs.start(producer().spec)).toMatch(/^bash-[0-9a-f-]{36}$/)
-    expect(ctx.jobs.start(producer({ kind: 'test-task' }).spec)).toMatch(/^test-task-[0-9a-f-]{36}$/)
-    expect(ctx.jobs.start(producer({ kind: 'workflow' }).spec)).toMatch(/^workflow-[0-9a-f-]{36}$/)
+    const first = ctx.jobs.start(producer().spec)
+    const second = ctx.jobs.start(producer().spec)
+    expect(first).toMatch(/^bash-[0-9a-f]{16}$/)
+    expect(second).toMatch(/^bash-[0-9a-f]{16}$/)
+    expect(second).not.toBe(first)
+    expect(ctx.jobs.start(producer({ kind: 'test-task' }).spec)).toMatch(/^test-task-[0-9a-f]{16}$/)
+    expect(ctx.jobs.start(producer({ kind: 'workflow' }).spec)).toMatch(/^workflow-[0-9a-f]{16}$/)
+  })
+
+  it('retries a short UUID collision without replacing a live job', async () => {
+    const ctx = await harness()
+    randomUuid
+      .mockReturnValueOnce('aaaaaaaa-aaaa-4aaa-8aaa-aaaaaaaaaaaa')
+      .mockReturnValueOnce('aaaaaaaa-aaaa-4aaa-8aaa-bbbbbbbbbbbb')
+      .mockReturnValueOnce('bbbbbbbb-bbbb-4bbb-8bbb-bbbbbbbbbbbb')
+    try {
+      const first = ctx.jobs.start(producer().spec)
+      const second = ctx.jobs.start(producer().spec)
+      expect(first).toBe('bash-aaaaaaaaaaaa4aaa')
+      expect(second).toBe('bash-bbbbbbbbbbbb4bbb')
+      expect(ctx.jobs.list().map(job => job.id)).toEqual([first, second])
+    } finally {
+      randomUuid.mockRestore()
+    }
   })
 })
 
@@ -727,7 +755,7 @@ describe('LocalJobRegistry owner isolation', () => {
       .toThrow('background job ownership requires the agent registry')
     // The failed registration mutated nothing: no stored job.
     expect(ctx.jobs.list()).toEqual([])
-    expect(ctx.jobs.start(producer().spec)).toMatch(/^bash-[0-9a-f-]{36}$/)
+    expect(ctx.jobs.start(producer().spec)).toMatch(/^bash-[0-9a-f]{16}$/)
   })
 
   it('rejects a session without a live agent and attaches cleanup once it has one', async () => {
@@ -752,7 +780,7 @@ describe('LocalJobRegistry owner isolation', () => {
         done: new Promise<JobOutcome>((res) => { settle = res }),
       }),
     })
-    expect(id).toMatch(/^bash-[0-9a-f-]{36}$/)
+    expect(id).toMatch(/^bash-[0-9a-f]{16}$/)
     await disposeAgentScope(ghost)
     expect(cancels).toEqual(['owner disposed'])
     expect(ctx.jobs.list(ghost.id)).toEqual([])
@@ -808,7 +836,7 @@ describe('LocalJobRegistry owner cleanup', () => {
     expect(cancels).toEqual(['owner disposed'])
     expect(ctx.jobs.list(owner.id)).toEqual([])
     expect(seen.map(event => event.type === 'removed' ? event.job.id : undefined)).toEqual([
-      expect.stringMatching(/^test-task-[0-9a-f-]{36}$/), expect.stringMatching(/^bash-[0-9a-f-]{36}$/),
+      expect.stringMatching(/^test-task-[0-9a-f]{16}$/), expect.stringMatching(/^bash-[0-9a-f]{16}$/),
     ])
   })
 
@@ -1143,7 +1171,7 @@ describe('LocalJobRegistry events', () => {
     const seen = collect(ctx, { owners: 'all' }, ['registered'])
 
     const id = ctx.jobs.start(producer().spec)
-    expect(id).toMatch(/^bash-[0-9a-f-]{36}$/)
+    expect(id).toMatch(/^bash-[0-9a-f]{16}$/)
     expect(seen).toHaveLength(1)
     expect(warn).toHaveBeenCalledWith(expect.stringContaining('event listener threw on registered'))
   })
diff --git a/packages/jobs/jobs/README.i18n.yaml b/packages/jobs/jobs/README.i18n.yaml
index 9f4e8c2123..390bb53bdd 100644
--- a/packages/jobs/jobs/README.i18n.yaml
+++ b/packages/jobs/jobs/README.i18n.yaml
@@ -9,8 +9,8 @@
   en: 721d849fde0fbebe
   zh: 9578ffb37edc5d7b
 /deepseek-ai-dsh-jobs/summary:
-  en: 64000a337f374627
-  zh: 251c13da2768bbd1
+  en: eea29995f4b49a6d
+  zh: acdded5ddee3a974
 /deepseek-ai-dsh-jobs/table-of-contents:
   en: d152484eb41ac6b4
   zh: 09388d293f9be9cb
@@ -18,8 +18,8 @@
   en: 1246c880d1c61927
   zh: 157c703fd2da6b9c
 /deepseek-ai-dsh-jobs/use-this-package/what-a-background-job-gives-you:
-  en: 92a9b9c0b6c9e748
-  zh: fc354b68facee753
+  en: 3df0e02f9928afb2
+  zh: 63cae8da533ec266
 /deepseek-ai-dsh-jobs/use-this-package/the-ownership-boundary:
   en: 167ab1eab8fad704
   zh: 7da554826fb483c1
diff --git a/packages/jobs/jobs/README.md b/packages/jobs/jobs/README.md
index a0fc8af18d..034bf232fe 100644
--- a/packages/jobs/jobs/README.md
+++ b/packages/jobs/jobs/README.md
@@ -9,7 +9,7 @@ English | [中文](README.zh.md)
 
 ## Summary
 
-`dsh-jobs` lets tools keep long-running work active while an agent continues. Each job receives a stable `<kind>-<uuid>` id, and its owning agent can read output, wait with a timeout, or request cancellation. Ownership is scoped to the agent session, so other agents cannot inspect or stop the job; completion arrives as an in-session notice without polling. Users can watch retained live output without consuming what the agent can read. Background jobs can start only when the deployment supplies job execution.
+`dsh-jobs` lets tools keep long-running work active while an agent continues. Each job receives a stable `<kind>-<short-uuid>` id, and its owning agent can read output, wait with a timeout, or request cancellation. Ownership is scoped to the agent session, so other agents cannot inspect or stop the job; completion arrives as an in-session notice without polling. Users can watch retained live output without consuming what the agent can read. Background jobs can start only when the deployment supplies job execution.
 
 ## Table of Contents
 
@@ -29,7 +29,7 @@ Use this package when you are composing a background-job capability or writing a
 
 ### What a background job gives you
 
-A producer registers work with a kind and a one-line label; the registry returns a `<kind>-<uuid>` id such as `bash-<uuid>`. Anyone who owns the job can read output, list jobs, wait up to a timeout for settlement, and request cancellation — each call returns a fresh projection of the job's status, from `running` and `stopping` to the terminal `completed`, `killed`, or `failed`. When a job settles, the registry's event stream announces it and `dsh-tool-jobs` turns the settlement into an in-session notice, so no polling is needed. A producer may attach an optional byte cap so each complete model-facing read or notice stays bounded.
+A producer registers work with a kind and a one-line label; the registry returns a `<kind>-<short-uuid>` id such as `bash-<short-uuid>`, where the suffix is 16 lowercase UUID hex characters. Anyone who owns the job can read output, list jobs, wait up to a timeout for settlement, and request cancellation — each call returns a fresh projection of the job's status, from `running` and `stopping` to the terminal `completed`, `killed`, or `failed`. When a job settles, the registry's event stream announces it and `dsh-tool-jobs` turns the settlement into an in-session notice, so no polling is needed. A producer may attach an optional byte cap so each complete model-facing read or notice stays bounded.
 
 A producer streams output by naming pull sources on its spec — non-consuming offset readers the registry pumps at its own cadence — or by pushing chunks through the `JobHandle` its starter receives; both land in the job's bounded ring, where `stdout` and `stderr` chunks reach the model and `log` chunks reach observers only. Observers read retained chunks at absolute byte offsets and are signaled on advancement; the settlement that ends the job also ends the stream, and `updateProgress` publishes a live progress line into every projection until then. Observation is invisible to the model: `readAt` consumes nothing and never touches notice state.
 
diff --git a/packages/jobs/jobs/README.zh.md b/packages/jobs/jobs/README.zh.md
index 66116fc34b..c05628b4c5 100644
--- a/packages/jobs/jobs/README.zh.md
+++ b/packages/jobs/jobs/README.zh.md
@@ -9,7 +9,7 @@ kind: "package-reference"
 
 ## 概述
 
-`dsh-jobs` 让工具可以在 agent（智能体）继续推进时保持长时间工作运行。每项任务都会获得稳定的 `<kind>-<uuid>` id，拥有它的 agent 可以读取输出、带超时等待或请求取消。归属范围限定在 agent 会话内，因此其他 agent 无法查看或停止任务；任务完成时会通过会话内通知送达，无需轮询。用户可以查看保留的实时输出，而不消耗 agent 可读取的内容。只有部署提供任务执行能力时，后台任务才能启动。
+`dsh-jobs` 让工具可以在 agent（智能体）继续推进时保持长时间工作运行。每项任务都会获得稳定的 `<kind>-<short-uuid>` id，拥有它的 agent 可以读取输出、带超时等待或请求取消。归属范围限定在 agent 会话内，因此其他 agent 无法查看或停止任务；任务完成时会通过会话内通知送达，无需轮询。用户可以查看保留的实时输出，而不消耗 agent 可读取的内容。只有部署提供任务执行能力时，后台任务才能启动。
 
 ## 目录
 
@@ -29,7 +29,7 @@ kind: "package-reference"
 
 ### 后台任务提供什么
 
-生产方以 kind 和一行标签注册工作；注册表返回 `<kind>-<uuid>` id，例如 `bash-<uuid>`。拥有任务的任何一方都可以读取输出、列出任务、带超时等待结算或请求取消——每次调用都返回任务状态的全新投影，从 `running`、`stopping` 到终止态的 `completed`、`killed` 或 `failed`。任务结算时，注册表的事件流宣布它，`dsh-tool-jobs` 把结算变成会话内通知，因此无需轮询。生产方可以附加一个可选的字节上限，让每次完整的模型侧读取或通知保持有界。
+生产方以 kind 和一行标签注册工作；注册表返回 `<kind>-<short-uuid>` id，例如 `bash-<short-uuid>`，其中后缀是 UUID 的 16 位小写十六进制字符。拥有任务的任何一方都可以读取输出、列出任务、带超时等待结算或请求取消——每次调用都返回任务状态的全新投影，从 `running`、`stopping` 到终止态的 `completed`、`killed` 或 `failed`。任务结算时，注册表的事件流宣布它，`dsh-tool-jobs` 把结算变成会话内通知，因此无需轮询。生产方可以附加一个可选的字节上限，让每次完整的模型侧读取或通知保持有界。
 
 生产方通过在 spec 上声明拉取源——由注册表按自己的节奏泵送的非消耗偏移读取器——或经 starter 收到的 `JobHandle` 推送块来流式输出；二者都落入该 job 的有界环，其中 `stdout` 与 `stderr` 块到达模型，`log` 块只到达观察者。观察者按绝对字节偏移读取保留块并在推进时收到信号；结束 job 的结算同时封流，在此之前 `updateProgress` 把实时进度行发布进每个投影。观测对模型不可见：`readAt` 不消耗任何东西，也从不触碰通知状态。
 
diff --git a/packages/jobs/jobs/src/brand.ts b/packages/jobs/jobs/src/brand.ts
index 0fe1986b4c..82e59f3663 100644
--- a/packages/jobs/jobs/src/brand.ts
+++ b/packages/jobs/jobs/src/brand.ts
@@ -13,14 +13,14 @@
 import type { Branded } from '@deepseek-ai/dsh-brand'
 
 /**
- * Identifies one job across registry lifetimes. The registry generates `<kind>-<uuid>`;
+ * Identifies one job across registry lifetimes. The registry generates `<kind>-<short-uuid>`;
  * access still requires owner authorization.
  */
 export type JobId = Branded<'JobId'>
 
 /**
  * Brand a string as a {@link JobId}.
- * @param id - the raw job-id string (the registry generates `<kind>-<uuid>`).
+ * @param id - the raw job-id string (the registry generates 16 UUID hex characters after the kind).
  * @returns the same string, branded; no validation is performed.
  */
 export function JobId(id: string): JobId {
diff --git a/packages/jobs/jobs/src/index.ts b/packages/jobs/jobs/src/index.ts
index 513f01f346..7f31c3795b 100644
--- a/packages/jobs/jobs/src/index.ts
+++ b/packages/jobs/jobs/src/index.ts
@@ -108,7 +108,7 @@ export abstract class JobRegistry extends Service {
    * rejection leaves no job id or execution resource. A throwing starter
    * leaves nothing registered; after it returns, registration cannot fail.
    * @param spec - job identity, owner, output sources, and synchronous starter.
-   * @returns the registry-issued `<kind>-<uuid>` id.
+   * @returns the registry-issued `<kind>-<short-uuid>` id.
    */
   abstract start(spec: JobSpec): JobId
 
diff --git a/packages/jobs/jobs/src/types.ts b/packages/jobs/jobs/src/types.ts
index 9fd2294956..33ea07d75b 100644
--- a/packages/jobs/jobs/src/types.ts
+++ b/packages/jobs/jobs/src/types.ts
@@ -137,7 +137,7 @@ export interface JobAppendOptions {
  * throwing, so a producer's trailing flush cannot break its own teardown path.
  */
 export interface JobHandle {
-  /** The registry-issued id (`<kind>-<uuid>`). */
+  /** The registry-issued id (`<kind>-<short-uuid>`). */
   readonly id: JobId
   /**
    * Append one chunk to the output ring. Offsets advance by the chunk's UTF-8
diff --git a/packages/jobs/jobs/src/view.ts b/packages/jobs/jobs/src/view.ts
index ad999ef418..ad778954ab 100644
--- a/packages/jobs/jobs/src/view.ts
+++ b/packages/jobs/jobs/src/view.ts
@@ -62,7 +62,7 @@ export interface JobChunk {
  * stream all consume this one shape.
  */
 export interface JobView {
-  /** The registry-issued id (`<kind>-<uuid>`). */
+  /** The registry-issued id (`<kind>-<short-uuid>`). */
   readonly id: JobId
   /**
    * The producer kind the job was registered with: a Host-registered
diff --git a/packages/jobs/tool-jobs/tests/tool-jobs.spec.ts b/packages/jobs/tool-jobs/tests/tool-jobs.spec.ts
index 4bf5ba59ed..0e69eca22c 100644
--- a/packages/jobs/tool-jobs/tests/tool-jobs.spec.ts
+++ b/packages/jobs/tool-jobs/tests/tool-jobs.spec.ts
@@ -930,7 +930,7 @@ describe('completion notices', () => {
       owner: owner.id,
       kind: 'test-task',
       label: 'x'.repeat(1_000),
-      outputLimitBytes: 61,
+      outputLimitBytes: 55,
     })
     ctx.jobs.start(first.spec)
     first.settle({ status: 'completed', detail: 'd'.repeat(1_000) })
@@ -956,7 +956,7 @@ describe('completion notices', () => {
       owner: owner.id,
       kind: 'test-task',
       label: 'x'.repeat(1_000),
-      outputLimitBytes: 80,
+      outputLimitBytes: 60,
     })
     ctx.jobs.start(second.spec)
     second.settle({ status: 'completed', detail: 'd'.repeat(1_000) })
@@ -982,7 +982,7 @@ describe('completion notices', () => {
       owner: owner.id,
       kind: 'pty-send',
       label: 'x'.repeat(1_000),
-      outputLimitBytes: 64,
+      outputLimitBytes: 56,
     })
     ctx.jobs.start(target.spec)
 
@@ -991,7 +991,7 @@ describe('completion notices', () => {
 
     const content = (inject.mock.calls[0]?.[0] as { content?: Array<{ type: string; text?: string }> } | undefined)?.content
     const notice = content?.[0]?.text ?? ''
-    expect(Buffer.byteLength(notice)).toBeLessThanOrEqual(64)
+    expect(Buffer.byteLength(notice)).toBeLessThanOrEqual(56)
     expect(notice).toBe('background job ended; use job_list for id.')
   })
 
@@ -999,11 +999,11 @@ describe('completion notices', () => {
     const { ctx } = await setup()
     const inject = vi.fn()
     const owner = await fakeAgent(ctx, 'notice-boundary', { inject })
-    const fixedBytes = Buffer.byteLength(`background job test-task-${'0'.repeat(36)}\n[notice truncated]\nDone; job_output.`)
+    const fixedBytes = Buffer.byteLength(`background job test-task-${'0'.repeat(16)}\n[notice truncated]\nDone; job_output.`)
     for (const [index, extra] of ['', ' (t'].entries()) {
       const p = producer({ owner: owner.id, kind: 'test-task', label: 'x'.repeat(1_000), outputLimitBytes: fixedBytes + extra.length })
       const id = ctx.jobs.start(p.spec)
-      expect(id).toMatch(/^test-task-[0-9a-f-]{36}$/)
+      expect(id).toMatch(/^test-task-[0-9a-f]{16}$/)
       p.settle({ status: 'completed' })
       await tick()
       const notice = (inject.mock.calls[index]?.[0] as { content?: Array<{ text?: string }> } | undefined)?.content?.[0]?.text
diff --git a/packages/shell/tool-bash/tests/background.spec.ts b/packages/shell/tool-bash/tests/background.spec.ts
index 9801a6dc1b..a4c6cd41de 100644
--- a/packages/shell/tool-bash/tests/background.spec.ts
+++ b/packages/shell/tool-bash/tests/background.spec.ts
@@ -122,7 +122,7 @@ describe('background bash output', () => {
       workdir: '/nonexistent-dsh',
       run_in_background: true,
     })
-    expect(text(started)).toMatch(/^started background job bash-[0-9a-f-]{36}$/)
+    expect(text(started)).toMatch(/^started background job bash-[0-9a-f]{16}$/)
     const jobs = ctx.jobs
     const job = jobs.list()[0]
     await until(() => jobs.get(job!.id).status === 'killed' ? true : undefined)
@@ -218,7 +218,7 @@ describe('foreground commands as jobs', () => {
       await until(() => execution?.observed.stdout.readFrom(0).text.includes('early-output') ? true : undefined, task.timeout)
       // The job exists from the start: the command is listed while the call still waits.
       const jobId = ctx.jobs.list()[0]?.id
-      expect(jobId).toMatch(/^bash-[0-9a-f-]{36}$/)
+      expect(jobId).toMatch(/^bash-[0-9a-f]{16}$/)
       expect(ctx.jobs.list()[0]).toMatchObject({ id: jobId, kind: 'bash', status: 'running', label: 'printf "early-output\\n"; sleep 30' })
       await vi.advanceTimersByTimeAsync(250)
       const result = await pending
diff --git a/packages/shell/tool-bash/tests/integration.spec.ts b/packages/shell/tool-bash/tests/integration.spec.ts
index c62436c099..f8c6cc87dd 100644
--- a/packages/shell/tool-bash/tests/integration.spec.ts
+++ b/packages/shell/tool-bash/tests/integration.spec.ts
@@ -227,7 +227,7 @@ describe('bash tool through the agent loop', () => {
       }),
       textResponse('Started it in the background.'),
       (options) => {
-        const jobId = /started background job (bash-[0-9a-f-]{36})/.exec(JSON.stringify(options.messages))?.[1]
+        const jobId = /started background job (bash-[0-9a-f]{16})/.exec(JSON.stringify(options.messages))?.[1]
         if (jobId === undefined) throw new Error('model history lacks the started job id')
         return toolCallResponse('call-2', 'job_output', { job_id: jobId })
       },
@@ -241,7 +241,7 @@ describe('bash tool through the agent loop', () => {
 
     const firstResult = findEvent(events(agent), 'tool/result')
     expect(firstResult.data.message.isError).toBe(false)
-    const jobId = /^started background job (bash-[0-9a-f-]{36})$/.exec(resultText(firstResult))?.[1]
+    const jobId = /^started background job (bash-[0-9a-f]{16})$/.exec(resultText(firstResult))?.[1]
     if (jobId === undefined) throw new Error('first tool result lacks a job id')
     // The turn closed with the task still running, so the notice cannot exist yet.
     const isNotice = (e: SessionEvent): e is SessionEvent<'user/message'> =>
diff --git a/packages/shell/tool-pwsh/tests/background.spec.ts b/packages/shell/tool-pwsh/tests/background.spec.ts
index 8c6582be5b..59b99b965c 100644
--- a/packages/shell/tool-pwsh/tests/background.spec.ts
+++ b/packages/shell/tool-pwsh/tests/background.spec.ts
@@ -289,7 +289,7 @@ describe('foreground commands as jobs (pwsh)', () => {
     const body = (result.content[0] as { text: string }).text
     expect(body).toContain('early-output')
     const jobId = ctx.jobs.list()[0]?.id
-    expect(jobId).toMatch(/^pwsh-[0-9a-f-]{36}$/)
+    expect(jobId).toMatch(/^pwsh-[0-9a-f]{16}$/)
     expect(body).toContain(`moved to background job ${jobId}]`)
     expect(body).toContain('read newer output with job_output, stop it with job_kill')
 
diff --git a/packages/test-support/session-snapshot/src/identity.ts b/packages/test-support/session-snapshot/src/identity.ts
index 22d8d69c0f..cca42657c2 100644
--- a/packages/test-support/session-snapshot/src/identity.ts
+++ b/packages/test-support/session-snapshot/src/identity.ts
@@ -1,6 +1,7 @@
 /** Relationship-preserving identity redaction for committed session snapshots. */
 
 const UUID_FRAGMENT_RE = /[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}/i
+const SHORT_JOB_ID_RE = /-[0-9a-f]{16}$/i
 const LEGACY_TOKEN_RE = /^\{\{(?:sessionId|messageId)\}\}$/
 const CANONICAL_TOKEN_RE = /^\{\{(session|message|approval|workflow|command|rpc|retry|id):([1-9]\d*)\}\}$/
 const ID_KEY_RE = /(?:^id$|Id$|Ids$)/
@@ -35,7 +36,8 @@ function messageId(value: unknown): string | undefined {
 }
 
 function redactedCandidate(value: string): boolean {
-  return UUID_FRAGMENT_RE.test(value) || LEGACY_TOKEN_RE.test(value) || CANONICAL_TOKEN_RE.test(value)
+  return UUID_FRAGMENT_RE.test(value) || SHORT_JOB_ID_RE.test(value)
+    || LEGACY_TOKEN_RE.test(value) || CANONICAL_TOKEN_RE.test(value)
 }
 
 /**
diff --git a/packages/test-support/session-snapshot/src/normalize.ts b/packages/test-support/session-snapshot/src/normalize.ts
index c4fcaaa762..39f3522a8c 100644
--- a/packages/test-support/session-snapshot/src/normalize.ts
+++ b/packages/test-support/session-snapshot/src/normalize.ts
@@ -48,6 +48,7 @@ const FILE_URI_PATH_PREFIX_RE = /(?:^|[^a-z0-9+.-])file:\/\/\/?$/i
 
 /** A UUID v4 string, the shape `randomUUID()` produces for session ids. */
 const UUID_RE = /[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}/gi
+const SHORT_JOB_ID_RE = /-[0-9a-f]{16}$/i
 // Separator runs also match JSON-escaped Windows paths; extraction preserves their exact serialized spelling.
 const LOCAL_SPILL_PATH_RE = new RegExp(
   String.raw`\{\{cwd\}\}[\\/]+\.spill[\\/]+session-[0-9a-f]{12}[\\/]+[0-9a-f]{12}-([A-Za-z0-9._~-]+?)`
@@ -363,7 +364,7 @@ export function normalizeSessionLog(
       if ((record.type !== 'job/registered' && record.type !== 'job/settled')
         || record.data === null || typeof record.data !== 'object') continue
       const id = (record.data as Record<string, unknown>).jobId
-      if (typeof id !== 'string' || id.search(UUID_RE) < 0 || jobTokens.has(id)) continue
+      if (typeof id !== 'string' || (id.search(UUID_RE) < 0 && !SHORT_JOB_ID_RE.test(id)) || jobTokens.has(id)) continue
       let token: string
       do { token = `{{id:${nextJobToken++}}}` } while (reservedTokens.has(token))
       jobTokens.set(id, token)
diff --git a/packages/test-support/session-snapshot/tests/normalize.spec.ts b/packages/test-support/session-snapshot/tests/normalize.spec.ts
index 62a6d03e7a..8457749b48 100644
--- a/packages/test-support/session-snapshot/tests/normalize.spec.ts
+++ b/packages/test-support/session-snapshot/tests/normalize.spec.ts
@@ -256,8 +256,10 @@ Additional instructions from: nested\AGENTS.md`,
 })
 
 describe('normalizeSessionLog', () => {
-  it('keeps job execution identities distinct in single-log and single-snapshot paths', () => {
-    const ids = ['bash-aaaaaaaa-aaaa-4aaa-8aaa-aaaaaaaaaaaa', 'bash-bbbbbbbb-bbbb-4bbb-8bbb-bbbbbbbbbbbb']
+  it.each([
+    { format: 'full UUIDs', ids: ['bash-aaaaaaaa-aaaa-4aaa-8aaa-aaaaaaaaaaaa', 'bash-bbbbbbbb-bbbb-4bbb-8bbb-bbbbbbbbbbbb'] },
+    { format: 'short UUIDs', ids: ['bash-aaaaaaaaaaaaaaaa', 'bash-bbbbbbbbbbbbbbbb'] },
+  ])('keeps $format distinct in single-log and single-snapshot paths', ({ ids }) => {
     const raw = [
       { type: 'session', version: 0, id: ctx.sessionIds[0], cwd: ctx.cwd, createdAt: 100 },
       { type: 'user/message', data: { text: 'Keep {{id:1}} literal.' } },
diff --git a/snapshots/session/background-confinement-failure/replay.override.json b/snapshots/session/background-confinement-failure/replay.override.json
index 74a53d0a36..e8c78b8282 100644
--- a/snapshots/session/background-confinement-failure/replay.override.json
+++ b/snapshots/session/background-confinement-failure/replay.override.json
@@ -52,7 +52,7 @@
         "index": 0,
         "id": "async-confinement-result",
         "name": "job_output",
-        "argumentsDelta": "{\"job_id\":\"{{fromRequest:(bash-[0-9a-f-]{36})}}\",\"wait\":true}"
+        "argumentsDelta": "{\"job_id\":\"{{fromRequest:(bash-[0-9a-f]{16})}}\",\"wait\":true}"
       },
       {
         "type": "block-end",
@@ -61,7 +61,7 @@
           "type": "tool-call",
           "id": "async-confinement-result",
           "name": "job_output",
-          "arguments": "{\"job_id\":\"{{fromRequest:(bash-[0-9a-f-]{36})}}\",\"wait\":true}"
+          "arguments": "{\"job_id\":\"{{fromRequest:(bash-[0-9a-f]{16})}}\",\"wait\":true}"
         }
       },
       {
diff --git a/snapshots/session/background-job-admission/replay.override.json b/snapshots/session/background-job-admission/replay.override.json
index c454fbdaa1..5d56fa2de8 100644
--- a/snapshots/session/background-job-admission/replay.override.json
+++ b/snapshots/session/background-job-admission/replay.override.json
@@ -23,8 +23,8 @@
     "kind": "chunks",
     "chunks": [
       { "type": "block-start", "index": 0, "blockType": "tool-call" },
-      { "type": "tool-call-delta", "index": 0, "id": "bounded-task-kill", "name": "job_kill", "argumentsDelta": "{\"job_id\":\"{{fromRequest:(bash-[0-9a-f-]{36})}}\",\"reason\":\"free the bounded task slot\"}" },
-      { "type": "block-end", "index": 0, "block": { "type": "tool-call", "id": "bounded-task-kill", "name": "job_kill", "arguments": "{\"job_id\":\"{{fromRequest:(bash-[0-9a-f-]{36})}}\",\"reason\":\"free the bounded task slot\"}" } },
+      { "type": "tool-call-delta", "index": 0, "id": "bounded-task-kill", "name": "job_kill", "argumentsDelta": "{\"job_id\":\"{{fromRequest:(bash-[0-9a-f]{16})}}\",\"reason\":\"free the bounded task slot\"}" },
+      { "type": "block-end", "index": 0, "block": { "type": "tool-call", "id": "bounded-task-kill", "name": "job_kill", "arguments": "{\"job_id\":\"{{fromRequest:(bash-[0-9a-f]{16})}}\",\"reason\":\"free the bounded task slot\"}" } },
       { "type": "usage", "usage": { "inputTokens": 10, "outputTokens": 5 } },
       { "type": "finish", "reason": { "kind": "tool-calls" } }
     ]
diff --git a/snapshots/session/headless.snapshot.ts b/snapshots/session/headless.snapshot.ts
index 23c77b0377..1d98c97e83 100644
--- a/snapshots/session/headless.snapshot.ts
+++ b/snapshots/session/headless.snapshot.ts
@@ -746,7 +746,7 @@ async function verifyBackgroundConfinementFailure(log: string, cwd: string): Pro
   const inspected = results.find(result => result.toolCallId === 'async-confinement-result')
   const registered = events.find(event => event.type === 'job/registered')
   if (registered?.type !== 'job/registered') throw new Error('missing registered job')
-  expect(registered.data.jobId).toMatch(/^bash-[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/)
+  expect(registered.data.jobId).toMatch(/^bash-[0-9a-f]{16}$/)
   expect(started).toMatchObject({
     isError: false, content: [{ type: 'text', text: `started background job ${registered.data.jobId}` }],
   })