packages: a protocol-incompatible package install answers 500 OS_PROTOCOL_INCOMPATIBLE and drops its structured diagnostic (requiredRange, rangeSource, protocolVersion, targetMajor, migrateCommand)

QA-source: #21720 · platform-core.manifest-install-contract · acceptance[1]

Clause A2 of platform-core.manifest-install-contract (rev 2) fails in the 17.7 pre-release run #21720 (subject 251a7dd4); verifier V4 re-derived it on two fresh DBs: CONFIRMED, P2. Predates 17.6.0.

Reproduction (admin)

POST /api/v1/packages {"manifest":{"id":"com.example.qa-old","name":"Old","version":"1.0.0","scope":"project","type":"app","engines":{"protocol":"^16"}}}

Expected: a 4xx carrying ProtocolIncompatibleDiagnostic — requiredRange, rangeSource, protocolVersion, targetMajor, migrateCommand.
Actual: 500 {"code":"OS_PROTOCOL_INCOMPATIBLE","message":"package '…' targets protocol ^16 (engines.protocol) but this runtime is protocol 17.0.0. … Run: objectstack migrate meta --from 16","httpStatus":500} — the fields exist only inside the prose.
Enforcement itself is right: GET /api/v1/packages/{id} → 404 afterwards (A1 passes).

Mechanism

ProtocolIncompatibleError (packages/metadata-core/src/protocol-handshake.ts:81-85) keeps the fields on .diagnostic and declares no status; it is thrown by assertProtocolCompat (packages/metadata-protocol/src/protocol.ts:25883).
The packages door passes it to deps.errorFromThrown(e, 500) (http-dispatcher.ts:1106) → resolveThrownHttpError (packages/types/src/thrown-http-error.ts:206), which reads only status, statusCode, code, message, userMessage, issues — .diagnostic is dropped and the status falls back to 500.

Two defects in one answer: the machine-readable diagnostic ADR-0087 D1 promises ("fail fast with a structured diagnostic … stable error code, the two versions … the exact replay command", docs/adr/0087-metadata-protocol-upgrade-contract.md:109-117) is missing, and a caller-authored manifest is reported as a server fault.

Generated by Claude Code

Triage: first grade — `bug` · `priority:p2` · `domain:engine` · `area:devpath` · `pm:queue`. The protocol refusal answers 4xx with ADR-0087 D1's structured diagnostic on the wire

Triage seat (objectstack-wide, seat post #6015) · session_01AavokzJ5DndAwitDXvKy4U · 2026-10-04T12:05Z. ⛔ Not a claim, ⛔ not a dispatch.

Why p2. The verifier judged it P2, and it predates 17.6.0. Enforcement is right: the package is not installed. But two promises break:

a caller-authored manifest is reported as a server fault (500);
the machine-readable diagnostic ADR-0087 D1 promises ("a structured diagnostic … stable error code, the two versions … the exact replay command") exists only inside the prose.

Routing: the thrown error is ProtocolIncompatibleError (packages/metadata-core/src/protocol-handshake.ts about :81–:85), so domain:engine. The fix lands at the error, not in the packages door.

Direction:

ProtocolIncompatibleError declares its 4xx status and carries .diagnostic (requiredRange, rangeSource, protocolVersion, targetMajor, migrateCommand) on a channel resolveThrownHttpError already forwards. That resolver builds a details record (packages/types/src/thrown-http-error.ts about :182, :234).
The claim measures which member the resolver reads before choosing. ⛔ No packages-door special case, so every door that calls assertProtocolCompat answers the same.
The ledger row for OS_PROTOCOL_INCOMPATIBLE (error-code-ledger.zod.ts about :632) states the status the claim picks.

Pins:

the install answers the 4xx, with all five diagnostic fields as members of details;
the package is still not installed;
one other door that calls assertProtocolCompat answers the same shape.

Generated by Claude Code

Claim: PM loop round 27 · 2026-10-04T12:31Z
Session: session_017ErfyP2Rx7XWHJA27QjyUi
Account: os-project-manager (the seat's linked user as GET /user answers it; always the card's assignee)
Branch: claude/issue-21727-protocol-incompatible-4xx
Worktree: objectstack-issue-21727
Domain: domain:engine
Seat: domain:engine#1
File surface (at origin/main 316be321ef), per triage's grade and direction 5979744340:

packages/metadata-core/src/protocol-handshake.ts: ProtocolIncompatibleError declares its 4xx status. It carries .diagnostic (requiredRange, rangeSource, protocolVersion, targetMajor, migrateCommand) on the channel resolveThrownHttpError already forwards into details. The claim measures which member that is before choosing.
- ⛔ No packages-door special case: every door that calls assertProtocolCompat answers the same.
packages/spec/src/api/error-code-ledger.zod.ts (about :632): the OS_PROTOCOL_INCOMPATIBLE row states the status chosen.
packages/types/src/thrown-http-error.ts: read only, unless the measurement shows no existing channel carries a structured record.
Tests; .changeset/21727-*.md.
Container & model: S, mode:subagent, model: default (dispatch-gates --tier: no path-derived mandate, Clause ② suspect surface).
Clause-②: yes
The published error envelope for OS_PROTOCOL_INCOMPATIBLE gains structured details members, and its ledger status moves from the 500 fallback to a declared 4xx. No accepted input changes.
packages/spec/src/** is touched, so a contract review is owed before landing. The seat runs it at the review tier.
Thread-read: 5979744340
Serial constraints cleared: at 2026-10-04T12:31Z:
Of the open PRs, none touches protocol-handshake.ts, error-code-ledger.zod.ts or thrown-http-error.ts.
This lane's in-flight [finding] an env-wide metadata row declaring _lock: full reads locked in an org-scoped read, but an org-scoped save of it is admitted — getEffectiveLock's overlay limb matches organization_id exactly #21716 holds protocol.ts's getEffectiveLock. This card reads assertProtocolCompat there and does not edit it.
os-verify-lock: the lock is free and the queue empty.

os-dev-report

{
  "issue": 21727,
  "status": "needs_decision",
  "branch": "claude/issue-21727-protocol-incompatible-4xx",
  "pr": null,
  "session": "session_017ErfyP2Rx7XWHJA27QjyUi — mode:subagent, so this is the parent PM session id; this run is identified by its branch",
  "premise_still_valid": true,
  "summary": "The defect reproduces at origin/main 316be321ef through the real packages door (a real ObjectStackProtocolImplementation and SchemaRegistry behind HttpDispatcher): POST /api/v1/packages with engines.protocol ^16 answers 500 OS_PROTOCOL_INCOMPATIBLE with no details, and GET /api/v1/packages/com.example.qaold answers 404, so enforcement holds. H1 FALSIFIES the triage direction's mechanism premise: resolveThrownHttpError (packages/types/src/thrown-http-error.ts:233-241) copies exactly three members into details — a truthy non-string .code, an array .issues (it arrives as details.issues) and a validation .fields — and drops both .details and .diagnostic at every status, so no existing channel can put the five fields as members of details. Both remaining routes collide with a standing ruling: widening the shared resolver's closed details list is the Option A the maintainer rejected by name on #9585 (2026-08-19, recorded in-tree at FlowActionRefusal in packages/runtime/src/action-execution.ts), and the #9585 precedent (a typed carrier recognised at the door) is the packages-door special case this card's triage ruling forbids. H3 also measured that only ONE HTTP door reaches assertProtocolCompat, so pin 3 has no HTTP target. No code was written and no PR opened; the status half (H2: 422) is decision-independent and ready for the follow-up.",
  "tests": "H1 probe — a temporary runtime test, deleted, never committed: OS_VERIFY_LOCK_SLOT=issue-21727 bash scripts/pm/os-verify-lock.sh -c 'pnpm --filter @objectstack/runtime exec vitest run --project local --maxWorkers=2 src/domains/zz-probe-21727.test.ts' → VERDICT command-exit 0, Tests 3 passed. A throw carrying code OS_PROTOCOL_INCOMPATIBLE plus details:{viaDetails}, diagnostic:{viaDiagnostic} and issues:[{viaIssues}] answered, with no status: 500 {code:OS_PROTOCOL_INCOMPATIBLE, httpStatus:500, details:{issues:[{viaIssues:I}]}}; with status:422: 422 {…, httpStatus:422, details:{issues:[{viaIssues:I}]}}. Only issues reaches the client, and a declared status is honoured. REAL ProtocolIncompatibleError through the real door → 500 {code:OS_PROTOCOL_INCOMPATIBLE, message:'package com.example.qaold targets protocol ^16 (engines.protocol) but this runtime is protocol 17.0.0. This is a major-version break. Run: objectstack migrate meta --from 16', httpStatus:500}, with no details. REAL GET → 404 RESOURCE_NOT_FOUND. The probe ran after building the dependency closure: os-verify-lock -c pnpm --workspace-concurrency=2 --filter '@objectstack/runtime^...' build → VERDICT command-exit 0. H4: diagnostic.migrateCommand and the prose's 'Run:' command come from one local in checkProtocolCompat (protocol-handshake.ts:250-257); measured equal on the real refusal. H2 experiment: node scripts/check-error-status-conformance.mjs exits 0 on HEAD, and exits 0 with 'readonly status = 422;' injected into ProtocolIncompatibleError (anchor hit count 1). The two outputs are byte-identical (diff exit 0): the gate does not derive this producer, because its code arrives through super(). Restored with git checkout HEAD -- packages/metadata-core/src/protocol-handshake.ts under an EXIT trap; git hash-object is 96146adab23e, equal to the HEAD blob; git diff HEAD is empty and git status --porcelain is empty after the probe was deleted. H5: no consumer anywhere. In packages/cli, client, client-react, mcp and create-objectstack src, 0 readers of OS_PROTOCOL_INCOMPATIBLE, migrateCommand, requiredRange or rangeSource beyond protocol-version-gap.ts's own local advisory. The SDK's client.packages.install surfaces wire error.details generically through its fetch wrapper, with no status branch. objectui main b508ac5 (a shallow read-only clone; the pinned .objectui-sha 2e818d0b was not read separately) has 0 hits; the control PERMISSION_DENIED hits. origin/main is still 316be321ef (fetched into a private ref): no same-day churn on the card's seven files.",
  "mcp_calls": "0",
  "api_writes": "1 — POST /repos/objectstack-ai/objectstack/issues/21727/comments (this os-dev-report, via scripts/pm/post-stamped.mjs). Also 1 git push of the empty branch (the write-route probe), which is not a REST write. pr_create and label-write: not used.",
  "open_questions": [
    {
      "question": "Q1. How should the ADR-0087 D1 structured diagnostic (requiredRange, rangeSource, protocolVersion, targetMajor, migrateCommand) reach error.details? H1: resolveThrownHttpError forwards no record-shaped member, and .details and .diagnostic are both dropped. Two standing rulings each forbid one of the two remaining routes.",
      "options": [
        "A — a narrow producer-declared channel in the shared resolver (@objectstack/types). For example, a Symbol.for-branded carrier that resolveThrownHttpError spreads into details, honoured only on a declared 4xx, with the reserved keys code, issues and fields refused. ProtocolIncompatibleError stamps exactly the five fields, and every door inherits them, which meets triage's 'no packages-door special case'. COST: it supersedes the maintainer's 2026-08-19 ruling on #9585, which rejected Option A ('any throw may declare wire payload') by name. The brand makes it narrower, but it is still a new wire channel any in-process producer can opt into, so it needs a maintainer ruling. FlowActionRefusal becomes a second idiom unless it is migrated. AXES: business — one measured door and zero readers today (H3, H5). Long-term — one rule in one place (#8016), and it would subsume FlowActionRefusal. AI-error — an opt-in wire channel every producer can reach is the arm #9585's triage called dangerous. Startup scope — a generic capability with one user.",
        "B — a typed carrier recognised at the door, the #9585 precedent. The install branch of packages/runtime/src/domains/packages.ts (around the protocolSvc.installPackage call) recognises ProtocolIncompatibleError (runtime already depends on @objectstack/metadata-core) ahead of the generic catch. It answers deps.error(message, status, { code, requiredRange, rangeSource, protocolVersion, targetMajor, migrateCommand }), and resolveThrownHttpError stays untouched. The error still declares its 4xx, so any caller that does not recognise it still answers the right status, without details. COST: it reverses this card's triage ruling 'No packages-door special case'. That ruling's stated reason ('every door that calls assertProtocolCompat answers the same') is met by construction today: H3 found one HTTP door. A future second door would need its own recognition line. AXES: business — covers 100% of the measured reach, and the SDK already surfaces error.details, so no client change. Long-term — keeps the closed resolver list (#8016, #9106, #9585) and leaves a resolver-level generalisation as a later, separately ruled step. AI-error — closed shape: exactly five named fields from one class. Startup scope — no new capability.",
        "C — status only: declare the 4xx and leave the five fields in the prose. COST: it contradicts triage's ruling that the missing structured diagnostic is one of the two broken promises, and agents keep parsing prose."
      ],
      "recommendation": "B. It needs only the triage seat to lift a fence whose two premises H1 and H3 falsified: that a channel the resolver already forwards exists, and that more than one door reaches the throw. A needs the maintainer to reverse a standing ruling. B is also the closed-shape, no-new-capability option on the AI-error and startup-scope axes. If the generic route is wanted instead, rule A as its own card that covers FlowActionRefusal too, rather than riding it in on this p2."
    },
    {
      "question": "Q2 (H2). Which 4xx does OS_PROTOCOL_INCOMPATIBLE declare, which the ledger row then states?",
      "options": [
        "422 — the manifest is well-formed but declares a range this runtime can never satisfy. Same-package precedent: SchemaValidationError (METADATA_SCHEMA_INVALID) 'Maps to HTTP 422'. The ledger's own 409 rule does not fit. The FLOW_CONVERSION_CONFLICT row reads '409, not 422 … the refusal comes from environment state, so resubmitting the same body cannot help', but this refusal comes from the body's own engines.protocol against a build-time constant, and the remedy is to change the body (objectstack migrate meta --from N).",
        "409 — reads the runtime protocol as conflicting state, which contradicts the split the FLOW_CONVERSION_CONFLICT row states."
      ],
      "recommendation": "422. Declare it as readonly status and statusCode on ProtocolIncompatibleError, and add a trailing comment stating 422 to the OS_PROTOCOL_INCOMPATIBLE row under '@objectstack/metadata-core' (error-code-ledger.zod.ts:632). Measured: check:error-status-conformance holds with it but does not derive this producer."
    },
    {
      "question": "Q3. Should the decision-independent status half land now, or wait for Q1?",
      "options": [
        "A — wait: one PR and one contract review, with all pins at once. The status is the same under every Q1 option.",
        "B — land 422 and the ledger row now as 'Part of #21727', followed by a second Clause-② PR for details."
      ],
      "recommendation": "A. The status half alone does not close QA clause A2, and it would cost a second contract review."
    },
    {
      "question": "Q4. Pin 3 ('one other door that calls assertProtocolCompat answers the same status and details shape') has no HTTP target. H3 found two callers of assertProtocolCompat. The first is ObjectStackProtocolImplementation.installPackage (metadata-protocol protocol.ts:26100), reached by POST /api/v1/packages; duplicatePackage also reaches it but swallows the throw in a best-effort catch (protocol.ts:22725-22744). The second is AppPlugin.init (runtime app-plugin.ts:409), a boot seam with no HTTP answer.",
      "options": [
        "replace pin 3 with a pin on the boot seam's thrown value: AppPlugin.init throws a ProtocolIncompatibleError carrying the same declared status, and under Q1-A the same resolved details",
        "drop pin 3"
      ],
      "recommendation": "Replace it with the AppPlugin.init thrown-value pin, asserting status under B and status plus resolved details under A."
    }
  ],
  "out_of_scope_findings": [
    "class: b (candidate) · reach: NOT MEASURED — read-only inference, no public-door run · evidence: packages/cloud-connection/src/marketplace-install-local-plugin.ts installs through registerApp and calls no protocol handshake; git grep over packages/cloud-connection/src for ProtocolCompat, PROTOCOL_VERSION, PROTOCOL_MAJOR and engines finds only a fixture comment (control: registerApp has 5 hits). ADR-0087 D1 reads 'The metadata loader and the package installer check engines.protocol … before loading' · dedupe words: install-local protocol handshake; os package install engines.protocol; OS_PROTOCOL_INCOMPATIBLE install-local; ADR-0087 D1 installer · carrier: none — 承接者:无 · noted, not filed",
    "observation · the no-protocol fallback in the packages door's install branch (packages/runtime/src/domains/packages.ts:1260, registry.installPackage(manifest, settings) when no protocol service resolves) skips the ADR-0087 handshake; it is reachable only in a composition without a protocol service · read-only inference · carrier: the #21727 follow-up PR if Q1-B is ruled, since it edits that branch · noted, not filed",
    "observation · check:error-status-conformance is blind to ProtocolIncompatibleError: the gate output is byte-identical with 'readonly status = 422' injected, because the class's code arrives through super(diagnostic.code, …) rather than as a readonly literal · carrier: the #21727 follow-up PR · noted, not filed"
  ],
  "gates": "NOT RUN — empty diff (files_changed is empty), so the derived set would measure nothing for this card. The one gate executed was the H2 experiment: check:error-status-conformance, exit 0 on HEAD and on HEAD plus the injected 422, with byte-identical output.",
  "line_budget": "n/a",
  "deviations": [
    "No PR, pr_create or label-write: the status is needs_decision (os-dev \"when to stop writing code\"), although the order anticipated a PR, its pins and reverse verification.",
    "origin/claude/issue-21727-protocol-incompatible-4xx was pushed empty (equal to 316be321ef) as the write-route probe; it has no commits.",
    "A conflict is surfaced, not resolved: the claim pre-authorised editing thrown-http-error.ts if no channel existed. That authorisation conflicts with the maintainer's #9585 ruling, so it was not exercised.",
    "Pin 3 is unsatisfiable as written (H3, Q4).",
    "Worktree ../objectstack-issue-21727 is removed at the end of this run; the branch is kept."
  ],
  "files_changed": []
}

Generated by Claude Code

Retriage request — `pm:retriage` · the fork #21727's os-dev report left (the report is the comment above)

domain:engine#1 (seat post #6367) · session_017ErfyP2Rx7XWHJA27QjyUi · 2026-10-04T12:55Z. The claim (5979944377) stands: pm:dispatched stays, the branch claude/issue-21727-protocol-incompatible-4xx is kept (empty), and the same dev resumes once this is answered. ⛔ No code was written.

What the dev measured, and the seat re-read

The measurements below were made at origin/main 316be321ef, through the real packages door.

The defect reproduces. POST /api/v1/packages with engines.protocol: "^16" answers 500 OS_PROTOCOL_INCOMPATIBLE with no details. GET answers 404, so enforcement holds.
The direction's mechanism premise is false (H1). resolveThrownHttpError (packages/types/src/thrown-http-error.ts, about :233–:241) copies exactly three members into details:
- a non-string .code;
- an array .issues;
- a validation .fields.
It drops both .details and .diagnostic at every status. A probe error carrying all three candidates delivered only issues. So no channel the resolver "already forwards" can carry the five fields as members of details.
The direction's other premise is false (H3). Only ONE HTTP door reaches assertProtocolCompat: installPackage, through POST /api/v1/packages. duplicatePackage swallows the throw in a best-effort catch, and AppPlugin.init is a boot seam with no HTTP answer.
Nobody reads the shape (H5). There are 0 readers of OS_PROTOCOL_INCOMPATIBLE or the five fields in the CLI, the SDK clients, MCP or objectui main. The SDK surfaces error.details generically.
The two remaining routes each meet a standing ruling:
- A, widening the shared resolver's closed details list (even a branded opt-in channel), is the option the maintainer rejected by name on A flow ACTION that fails cannot carry the author's errorMessage or the run summary — the /actions door has no channel for them #9585 (2026-08-19, recorded at FlowActionRefusal in packages/runtime/src/action-execution.ts).
- B, a typed carrier recognised at the door, is A flow ACTION that fails cannot carry the author's errorMessage or the run summary — the /actions door has no channel for them #9585's own precedent, and it is what this card's "⛔ No packages-door special case" fence forbids.

Asked of triage (one answer each)

Lift the "No packages-door special case" fence and rule B? The packages door's install branch recognises ProtocolIncompatibleError ahead of its generic catch and answers its declared status with details: { code, requiredRange, rangeSource, protocolVersion, targetMajor, migrateCommand }. resolveThrownHttpError stays untouched.
- Seat's recommendation: B.
- The fence's stated purpose ("every door that calls assertProtocolCompat answers the same") is met today by construction: H3 found one HTTP door.
- The error itself declares its 4xx, so any other caller still answers the right status without details.
- B keeps the closed resolver list (The direct-mount REST package door answers 500 INTERNAL_ERROR for coded 4xx errors the dispatcher twin maps correctly #8016, [Decision] The dispatcher's error.code has a limb authored by TENANTS at runtime — registration cannot close it, and ADR-0112 does not say what should happen there #9106, A flow ACTION that fails cannot carry the author's errorMessage or the run summary — the /actions door has no channel for them #9585). A would need the maintainer to reverse A flow ACTION that fails cannot carry the author's errorMessage or the run summary — the /actions door has no channel for them #9585, and is better ruled on its own card together with FlowActionRefusal than carried in on this p2.
The status (H2): 422? The manifest is well-formed but declares a range this runtime cannot satisfy, and the remedy is to change the body (objectstack migrate meta --from N).
- Same-package precedent: SchemaValidationError (METADATA_SCHEMA_INVALID) is 422.
- The ledger's own FLOW_CONVERSION_CONFLICT row reserves 409 for refusals that come from environment state.
- The OS_PROTOCOL_INCOMPATIBLE row (packages/spec/src/api/error-code-ledger.zod.ts:632) states 422.
- Seat's recommendation: 422.
One PR, not two? The status half does not close QA clause A2 on its own, and splitting it costs a second contract review. Seat's recommendation: one PR.
Pin 3, which has no HTTP target: replace it with a pin on AppPlugin.init's thrown value (the same ProtocolIncompatibleError with the declared status)? Seat's recommendation: replace it.

Noted in the report, not filed

marketplace-install-local calls no protocol handshake (ADR-0087 D1 names "the package installer"). This is read-only inference with reach NOT MEASURED.
The packages door's no-protocol-service fallback skips the handshake. It is reachable only without a protocol service, and its carrier is this card's follow-up PR under B.
check:error-status-conformance is blind to ProtocolIncompatibleError: its code arrives through super(). Its carrier is this card's follow-up PR.

Contract: under B the line stays Clause-②: yes (the error envelope gains details members, and the ledger row states 422). packages/spec/src/** is touched, so the seat runs a contract review before landing.

Generated by Claude Code

Triage answers `pm:retriage` (`5980158580`): 1 B · 2 422 · 3 one PR · 4 replace pin 3. This amends my `5979744340`

Triage seat (objectstack-wide, seat post #6015) · session_01AavokzJ5DndAwitDXvKy4U · 2026-10-04T13:51Z. ⛔ Not a claim, ⛔ not a dispatch. pm:retriage is removed in this act. The claim 5979944377 and pm:dispatched stand.

What my grade got wrong. It said resolveThrownHttpError "already forwards" a details record that the error could ride. H1 measured otherwise: the resolver copies only .code, .issues and .fields, and drops .details and .diagnostic at every status. It also fenced off "a packages-door special case" so that "every door that calls assertProtocolCompat answers the same". H3 measured that there is only one HTTP door. So the fence's purpose is met by construction, and the fence itself blocked the only route that keeps a standing ruling.

1. B: the fence is lifted.

The packages door's install branch recognises ProtocolIncompatibleError ahead of its generic catch. It answers the error's declared status with details: { code, requiredRange, rangeSource, protocolVersion, targetMajor, migrateCommand }.
resolveThrownHttpError is untouched. Its closed list is the maintainer's A flow ACTION that fails cannot carry the author's errorMessage or the run summary — the /actions door has no channel for them #9585 ruling (2026-08-19, recorded at FlowActionRefusal), and widening it (A) would need that ruling reversed. ⛔ Not on this card.
The error itself declares its status, so any non-HTTP caller (AppPlugin.init) still carries the right class without the carrier.

2. 422.

The manifest is well-formed, but it declares a range this runtime cannot satisfy. The remedy is a body change (objectstack migrate meta --from N).
It matches SchemaValidationError's 422 in the same package. 409 stays reserved for environment-state refusals, per the ledger.
The OS_PROTOCOL_INCOMPATIBLE row states 422.

3. One PR. The status half alone does not close QA clause A2, and one contract review covers both.

4. Replace pin 3 with a pin on AppPlugin.init's thrown value: the same ProtocolIncompatibleError, carrying the declared 422. Pins 1 and 2 stand on the one HTTP door.

The report's notes:

marketplace-install-local calls no protocol handshake. ADR-0087 D1 names "the package installer", but reach is not measured. The claim measures it in this PR. If an incompatible manifest installs through that path, the dev files it as an out-of-scope finding with the measurement. ⛔ It is not fixed here.
The no-protocol-service fallback and check:error-status-conformance's blind spot ride this PR, as the report proposes.

Clause-②: yes stands.

Generated by Claude Code

os-dev-report

{
  "issue": 21727,
  "status": "done",
  "branch": "claude/issue-21727-protocol-incompatible-4xx",
  "pr": "https://github.com/objectstack-ai/objectstack/pull/21760",
  "session": "session_017ErfyP2Rx7XWHJA27QjyUi — mode:subagent, so this is the parent PM session id; this run is identified by its branch",
  "premise_still_valid": true,
  "summary": "Route B as triage ruled in 5980718772. ProtocolIncompatibleError (packages/metadata-core/src/protocol-handshake.ts) declares status and statusCode 422 and a literal code 'OS_PROTOCOL_INCOMPATIBLE', and carries a Symbol.for brand with the exported isProtocolIncompatibleError predicate (the FlowActionRefusal idiom). The install branch of POST /api/v1/packages (packages/runtime/src/domains/packages.ts) recognises it ahead of its generic catch and answers the declared 422. On the wire, error.code is OS_PROTOCOL_INCOMPATIBLE and error.details holds exactly requiredRange, rangeSource, protocolVersion, targetMajor and migrateCommand, with the message unchanged. resolveThrownHttpError and @objectstack/types are untouched. Riders: the no-protocol-service fallback now runs the same handshake, and check:error-status-conformance now derives this producer (404 producer sites, up from 403, and 86 derived codes, up from 85, with OS_PROTOCOL_INCOMPATIBLE named). The ledger row states 422. Measured, not fixed: install-local installs a ^16 manifest (finding below). Draft PR #21760 is open and assigned to os-project-manager. CI is in_progress at report time.",
  "tests": "All at HEAD 2de914e50e, after merging origin/main ea7ff394b6, unless a sha is named. Runtime full: pnpm --filter @objectstack/runtime exec vitest run --project local --maxWorkers=2 → Test Files 324 passed (324), Tests 4617 passed | 19 skipped (4636). metadata-core full: pnpm --filter @objectstack/metadata-core run test → 17 files, 328 passed. spec ledger: pnpm --filter @objectstack/spec exec vitest run src/api/error-code-ledger.test.ts → 21 passed. Typecheck: @objectstack/runtime (tsc --noEmit plus check:test-typecheck OK, 27 files / 190 errors / 68 pinned signatures held) and @objectstack/metadata-core, both exit 0. pnpm --filter @objectstack/spec check:generated → all 15 generated artifacts up to date. PINS (packages/runtime/src/domains/packages-install-protocol-incompatible.test.ts, real ObjectStackProtocolImplementation and SchemaRegistry behind HttpDispatcher): (1) 422, code OS_PROTOCOL_INCOMPATIBLE, httpStatus 422, ApiErrorSchema parse, details keys exactly the five, each equal to the prose; (2) GET /api/v1/packages/com.example.qaold → 404 RESOURCE_NOT_FOUND, with no registry row; (3, replaced) app-plugin.test.ts: AppPlugin.init throws a ProtocolIncompatibleError (instanceof and brand) with status and statusCode 422. Also pinned: the fallback refusal, lit controls on both arms (201, then a 200 read-back), a lookalike served by the generic catch (500, no details), and the brand, status and literal code in protocol-handshake.test.ts. REVERSE VERIFICATION from committed b5bdd1be86, under an EXIT/INT/TERM trap: both mutations went through scripts/ablation-replace.mjs --hold. The door recognition was turned into if (false && …): anchor 1→0, blob 2fc34268→838e7074. The readonly status and statusCode lines were deleted: anchor 1→0, blob b15e059f→edaaa53b. metadata-core was rebuilt, and ablation-dist-preflight '…' --absent showed 'this.statusCode = 422;' absent from all 12 dist files. The ablated run gave Tests 3 failed | 39 passed (42). The FAIL set was exactly pin 1 (expected 500 to be 422), the fallback refusal, and pin 3 (toMatchObject 422); pin 2, the controls and the lookalike stayed green. Restore: git checkout HEAD -- on the absolute paths, blobs equal to HEAD (2fc34268, b15e059f), git diff HEAD empty. After a rebuild, preflight showed the marker present and the tree clean, and the rerun was Tests 42 passed (42). STATUS-CONFORMANCE: node scripts/check-error-status-conformance.mjs exit 0. Scope moved from 403 to 404 producer sites and from 85 to 86 derived codes, and --report names OS_PROTOCOL_INCOMPATIBLE in the derived-but-not-reconciled list. Measured earlier, a status alone with the code only via super() left the output byte-identical. INSTALL-LOCAL MEASUREMENT: a temporary probe, deleted and never committed, drove the real MarketplaceInstallLocalPlugin through start and kernel:ready, then POST /api/v1/marketplace/install-local with engines.protocol ^16. It answered status 200, success true, registered [com.example.qaold], wrote ledger file com.example.qaold.json, ran syncSchemas once, and emitted 0 protocol warnings. The ^17 control was identical. ESLINT, as a declared narrowing: eslint --no-inline-config --format json on the six changed TS files → files 6, errors 0, warnings 0. All six are in the config's **/*.{ts,…} block. Invariance: eslint.config.mjs never enables type-aware linting (no parserOptions.project, stated at :326-:328), so untouched files' verdicts cannot move.",
  "mcp_calls": "0",
  "api_writes": "4 REST writes, all through the fleet-write relay as objectstack-fleet[bot]. In this resume: POST /repos/objectstack-ai/objectstack/pulls (pr_create, draft, #21760; 10267 bytes stored identical); POST /repos/objectstack-ai/objectstack/issues/21760/assignees via scripts/pm/label-write.mjs (os-project-manager, read back MATCHES; no label written); and POST /repos/objectstack-ai/objectstack/issues/21727/comments (this os-dev-report). In the first leg of this run: POST /repos/objectstack-ai/objectstack/issues/21727/comments, the needs_decision os-dev-report 5980137895. Plus git push (not REST): the empty branch, then af857331a2, b5bdd1be86 and the merge commit 2de914e50e.",
  "open_questions": [
    {
      "question": "The Clause-② arm for the fallback rider. In a composition with no protocol service, POST /api/v1/packages used to install a manifest the composed door refuses; it now refuses it. Is that a narrowing of a published accept set (making the line 'yes (narrowing)', which is BREAKING) or a pull-back to ADR-0087 D1's installer contract?",
      "options": [
        "A — keep 'Clause-②: yes': the published contract (ADR-0087 D1; the composed door) already refused this input, and only a degraded composition accepted it",
        "B — 'Clause-②: yes (narrowing)': the changeset then reads as breaking; its adr-0087 not-required (no-migration-prescription) marker already answers the disposition"
      ],
      "recommendation": "A, as triage ruled ('Clause-②: yes stands'). The PR's Acceptance notes state the fact so the contract review can decide."
    }
  ],
  "out_of_scope_findings": [
    "class: b · reach: POST /api/v1/marketplace/install-local, measured through the plugin's real route handler (MarketplaceInstallLocalPlugin driven through start and kernel:ready, in the id-gate test's harness, with a stub manifest service), not a booted server. A manifest with engines.protocol ^16 answers 200 success:true: it is registered, the ledger file com.example.qaold.json is written, syncSchemas runs, and 0 protocol warnings are emitted, identical to the ^17 control. POST /api/v1/packages refuses the same manifest with 422 · contract: ADR-0087 D1, 'The metadata loader and the package installer check engines.protocol … before loading a package's metadata', in packages/cloud-connection/src/marketplace-install-local-plugin.ts (git grep: no checkProtocolCompat or assertProtocolCompat) · Seam: spec:ManifestSchema engines.protocol → runtime:MarketplaceInstallLocalPlugin install route (packages/cloud-connection/src/marketplace-install-local-plugin.ts) · not measured: the kernel:ready rehydrate of an already-ledgered package · dedupe words: install-local protocol handshake; engines.protocol install-local; OS_PROTOCOL_INCOMPATIBLE marketplace; ADR-0087 D1 package installer; os package install incompatible",
    "observation · check:error-status-conformance R1 silently skips any class that declares a status but whose code arrives only through super(); this PR made the one producer visible, while the gate-side unresolved report for that shape stays undone · carrier: none — 承接者:无 · noted in the PR's Acceptance notes, not filed"
  ],
  "gates": "At 2de914e50e: node scripts/pm/dispatch-gates.mjs --ran reports '89 derived, 89 run, 0 NOT-MEASURED, 0 UNRUN', with every row recording its exit code. All 89 exit 0. check:dual-build-cjs-loads first exited 3 (PREREQUISITE NOT MET), then exited 0 after a full turbo build (72 tasks): 106 require entry points across 66 packages load. check:type-check-debt was first killed by my 400s cap, then exited 0 on rerun: 1 ledger entry re-measured, none above its number. The artifact-roster block (52 commands) all exit 0. check:published-readme-exports first exited 3 and was rerun green after the build. Three PR-context gates were run against PR 21760 and are green: check-closing-target-claim ('PR #21760 closes #21727, and each carries a Claim: whose Branch: line names' the branch), check-partof-closing-keyword (with PR_BODY) and check-single-claim-paths. The four symbol-anchor sweeps exit 0: adr-symbol-anchors '2167 anchors across 140 records resolve'; scripts-symbol-anchors '3760 anchors across 282 scripts resolve'; spec-docblock-symbol-anchors '4951 anchors across 1868 spec sources resolve'; adr-anchors 'OK (60 anchored file(s), every governing ADR still referenced'. Key verdicts: adr-0087-registration ('no declared-breaking changeset (1 non-breaking changeset(s) seen)'); changeset-no-major; error-code-casing; dispatcher-error-vocabulary OK; route-envelope; error-status-conformance; nul-bytes OK (10109 files); issue-citations (15 citations resolve); cross-package-test-inputs OK; test-source-alias OK; changeset-fixed in sync. CI at report time: 13 check runs completed with 0 failures, and 19 in_progress.",
  "line_budget": "n/a",
  "deviations": [
    "Wire count: the ruling spells details as six members including code. The door hands deps.error those six, but the shared envelope builder promotes code into error.code (ADR-0112 D5 retires error.details.code), so error.details carries five on the wire. The PR body states this exactly; FlowActionRefusal's exit behaves the same way.",
    "The addendum says 422 'matching how SchemaValidationError declares 422'. Measured: SchemaValidationError declares no status member, only a docblock ('Maps to HTTP 422'). The value matches, and the spelling follows the status plus statusCode convention.",
    "A brand plus an exported isProtocolIncompatibleError predicate was added to @objectstack/metadata-core, a new export, to follow the FlowActionRefusal idiom across the dual ESM and CJS builds. The changeset covers it.",
    "'Make the gate see this producer' was met on the producer side (a literal readonly code). scripts/check-error-status-conformance.mjs is unchanged.",
    "The spec ledger test was run first at b5bdd1be86, as the PR body states, and rerun green at 2de914e50e after the merge (the merge touched the ledger with INVALID_SCREEN_INPUT). The PR body was written once and not patched.",
    "Two os-dev-report comments on #21727 in this dispatch: 5980137895 (needs_decision, first leg) and this resume report, which the coordinator ordered.",
    "Worktree ../objectstack-issue-21727 is removed (node_modules first) after this report is posted; the branch and PR remain."
  ],
  "files_changed": [
    ".changeset/21727-protocol-incompatible-422.md",
    "packages/metadata-core/src/protocol-handshake.ts",
    "packages/metadata-core/src/protocol-handshake.test.ts",
    "packages/runtime/src/domains/packages.ts",
    "packages/runtime/src/domains/packages-install-protocol-incompatible.test.ts",
    "packages/runtime/src/app-plugin.test.ts",
    "packages/spec/src/api/error-code-ledger.zod.ts"
  ]
}

Generated by Claude Code

Landed: PR #21760 → e83c9f6154 on main (merged 2026-10-05T00:47Z through the merge queue, entered 2026-10-05T00:16Z), verified at 2026-10-05T00:47Z. domain:engine#1 · session_017ErfyP2Rx7XWHJA27QjyUi.

The squash is on origin/main as a single-parent commit. Its diffstat is the reviewed one: 7 files, +420/-5.
The fix is on main. isProtocolIncompatibleError is in packages/metadata-core/src/protocol-handshake.ts, and the packages door's install branch calls it in packages/runtime/src/domains/packages.ts.
The contract review PASSed at CONTRACT_REVIEW_TIER on the landed head 2de914e50e. The record is 5985910103 on the PR.
Fixes #21727 closed this card as completed. pm:dispatched is removed in this act. No other card was closed by the body.
From this release on, POST /api/v1/packages refuses a protocol-incompatible manifest with 422 OS_PROTOCOL_INCOMPATIBLE, not 500. error.details carries requiredRange, rangeSource, protocolVersion, targetMajor and migrateCommand.
The door's no-protocol-service fallback runs the same handshake as the composed door, so it no longer installs a manifest the composed door refuses.
Filed from this card: [finding] marketplace install-local installs a manifest whose engines.protocol this runtime cannot satisfy (^16 on 17): 200 success, while POST /api/v1/packages refuses it 422 OS_PROTOCOL_INCOMPATIBLE #21762. marketplace-install-local runs no protocol handshake and installs a ^16 manifest with 200.

Generated by Claude Code

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packages: a protocol-incompatible package install answers 500 OS_PROTOCOL_INCOMPATIBLE and drops its structured diagnostic (requiredRange, rangeSource, protocolVersion, targetMajor, migrateCommand) #21727

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Triage: first grade — `bug` · `priority:p2` · `domain:engine` · `area:devpath` · `pm:queue`. The protocol refusal answers 4xx with ADR-0087 D1's structured diagnostic on the wire

Retriage request — `pm:retriage` · the fork #21727's os-dev report left (the report is the comment above)

What the dev measured, and the seat re-read

Asked of triage (one answer each)

Noted in the report, not filed

Triage answers `pm:retriage` (`5980158580`): 1 B · 2 422 · 3 one PR · 4 replace pin 3. This amends my `5979744340`

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packages: a protocol-incompatible package install answers 500 OS_PROTOCOL_INCOMPATIBLE and drops its structured diagnostic (requiredRange, rangeSource, protocolVersion, targetMajor, migrateCommand) #21727

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objectstack-fleet commented on Oct 4, 2026

Triage: first grade — bug · priority:p2 · domain:engine · area:devpath · pm:queue. The protocol refusal answers 4xx with ADR-0087 D1's structured diagnostic on the wire

objectstack-fleet commented on Oct 4, 2026

objectstack-fleet commented on Oct 4, 2026

objectstack-fleet commented on Oct 4, 2026

Retriage request — pm:retriage · the fork #21727's os-dev report left (the report is the comment above)

What the dev measured, and the seat re-read

Asked of triage (one answer each)

Noted in the report, not filed

objectstack-fleet commented on Oct 4, 2026

Triage answers pm:retriage (5980158580): 1 B · 2 422 · 3 one PR · 4 replace pin 3. This amends my 5979744340

objectstack-fleet commented on Oct 4, 2026

objectstack-fleet commented on Oct 5, 2026

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Issue actions

Triage: first grade — `bug` · `priority:p2` · `domain:engine` · `area:devpath` · `pm:queue`. The protocol refusal answers 4xx with ADR-0087 D1's structured diagnostic on the wire

Retriage request — `pm:retriage` · the fork #21727's os-dev report left (the report is the comment above)

Triage answers `pm:retriage` (`5980158580`): 1 B · 2 422 · 3 one PR · 4 replace pin 3. This amends my `5979744340`