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mcp-server-runtime:443 把 metadata outage 答成 'Agent "X" not found' —— fail-closed 但误述,#5840 定性后的 cli 侧跟进 #6055
Description
Activity
解除阻塞:Blocked-by #5840 已随 PR #6051 于 2026-08-07T01:49Z MERGED 而关闭 ——
getDiagnosed(registry-first 诊断读法)已在IMetadataService上以可选成员落地,本单描述的 cli 侧跟进(mcp-server-runtime.ts:443的 fail-closed 误述)现在有了可直接消费的生产端形状与两个可照抄的消费端样本(protocol.ts的 503 化、objectql/plugin.ts的 warn 化,取舍论证见 PR #6051 正文)。摘pm:blocked,交 cli 车道正常排批。执行席 PM
session_019Q7oc7ASjh8yxyS3Yz78We(engine-core 车道,跨席移交完成)。
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Triage (maintainer-directed batch, 2026-08-07): routed
domain:cli— the fix lands atpackages/mcp/src/mcp-server-runtime.ts:443(switch the lookup to the diagnosed variant so a metadata outage answers an honest unavailable error instead ofAgent "X" not found). Anchored by code read; triage seat may veto.
Generated by Claude Code
Claim: PM loop round 2 (domain:cli seat, 2026-08-08 shift)
Session:session_017uFVNMmTxLpmfQYiuKM1Yx
Branch:claude/issue-6055-mcp-metadata-outage-diagnosed
Worktree:objectstack-issue-6055
Domain:domain:cli
File surface:packages/mcp/src/mcp-server-runtime.ts+ its tests + one.changeset/*.md(stop on breach; explain in the report)
Serial constraints cleared: no dev in flight in this lane; no other issue in this batch touchespackages/mcp; no open PR touchesmcp-server-runtime.ts. Container sizing: S,mode:subagentshared container.Blocker verified closed, not assumed. The body carries
Blocked-by: #5840, and #5840 is closed as completed (2026-08-07T01:49:51Z), with PR #6051 landing thegetDiagnosed(type, name) → { data, degraded, errors }addition this card consumes. The card is therefore genuinely dispatchable; the body'sBlocked-byline is satisfied rather than pending. Recording the check here because a reader who greps the body line without checking the referenced issue's state would wrongly skip this card — the line is a criterion, not a verdict.
Generated by Claude Code
Part of #5840(engine-core 车道按跨座位协议转席;定性测量由该单 dev 完成,⛔ 未改动 cli 车道文件)。
事实(#5840 / PR #6051 的跨车道定性,origin/main)
packages/mcp/src/mcp-server-runtime.ts:443(行号会漂,内容定位:metadataService.get('agent', agentName))把get()的undefined一律读成「不存在」:metadata 平面 outage 时,MCP 调用方拿到Error: Agent "X" not found—— 误述(把可用性故障讲成声明事实,ADR-0110 D3 的形状),但 fail-closed(不放宽任何访问),故非安全缺陷,是诊断质量缺陷。修法(PR #6051 落地后可用)
PR #6051 已在
IMetadataService提供可选getDiagnosed(type, name) → { data, degraded, errors }(spec 座位核可在途)。本单 = mcp 调用点切换到诊断版读法,degraded 时返回如实的 unavailable 错误(而非 not found),错误措辞与 #5532/#5843 家族的 SERVICE_UNAVAILABLE 口径对齐。Blocked-by: #5840(PR #6051 合入后解锁)。
Refs #5840 / PR #6051、ADR-0110 D3、#5532/#5705。