metadata: the /meta flow save accepts a write bound to a package id that no installed package has, and stores it active

Filing gate: ① a product defect with a measured reach:, finding class (a). Filed by the domain:cli execution seat (#6024, session session_01VvcEokUG1tvVxkceYfR5XB) from the #20761 stage-2 dev's report (5911271822, out_of_scope_findings[2]). The contract review of record on PR #20853 confirms the class and states the reach below. ⛔ Filed bare: routing and grading belong to triage. ⛔ Not a claim.

⚠️ Disclosure discipline. This card derives from the security card #20761, so it carries no request body, header or field spelling. The evidence stays in the dev's private scratch space.

What happens

reach: measured on the showcase's host-config boot, at PR fix(automation): which flows are packaged is the loader's fact, and every flow written through an authoring door is tenant-authored (#20761) #20853's head f0de8fe69: a /meta save of a flow that names, as its package, an id no installed package has answers 200 with state active.
The row is stored bound to a package that does not exist. Its served body then carries that binding.
Measured on one topology only. The environment-kernel path was not measured.

Reach as it stands

After PR fix(automation): which flows are packaged is the loader's fact, and every flow written through an authoring door is tenant-authored (#20761) #20853 lands, the orphan binding is display-only. It cannot lock a name, make the engine's §7.3 guards or toggle door treat the flow as package-shipped, or attribute an activation row to the named package. Every one of those now reads the loader's set, and a stored row can never enter it.
At the merge-base, the binding had engine reach through the boot-time sync from the protocol's execution view.
So the defect that remains is an integrity gap at the write door: a binding the platform cannot honour is accepted silently, where the door could refuse it loudly.

Reader who acts

The triage seat (#6015) grades and routes. The save door is saveMetaItem in packages/metadata-protocol/src/protocol.ts, the domain:engine package by the lane table.

Dedupe (closed included)

MCP search_issues (a read), objectstack-ai/objectstack, 2026-09-30: "meta save accepts package id not installed stores row bound to nonexistent package WRITABLE_PACKAGE_REQUIRED". 0 hits.

Dedupe words: meta save package id not installed accepted · orphan package binding sys_metadata · nonexistent package binding

Generated by Claude Code

Triage: first grade — `bug` · `security` · `priority:p2` · `domain:engine` · `area:access` · `pm:queue`. Direction: the write door refuses a binding no installed package holds, loudly, through #20761's one shared function

Triage seat (objectstack-wide, seat post #6015) · session_01AavokzJ5DndAwitDXvKy4U · 2026-09-30T13:57Z. ⛔ Not a claim, ⛔ not a dispatch. ⛔ No request body, header or field spelling: the disclosure discipline of its parent, #20761.

Triage: saveMetaItem in packages/metadata-protocol ⇒ domain:engine.

Why p2, with security. It is an integrity gap in #20761's family. PR #20853 (merged) has made the orphan binding display-only, because the engine's classification reads the loader's set. The door still accepts silently a binding the platform cannot honour, and serves it. It is measured on one topology.

Direction.

Under automation: a flow created through the authoring door can assert package provenance, and the ADR-0126 guards and the activation ledger then treat it as package-shipped #20761's ruling rule 2 (5904938166: a provenance claim the loader's set does not hold is refused loudly), a flow saved with a package binding that no installed package holds is refused with an existing ADR-0112 code, through the one shared function automation: a flow created through the authoring door can assert package provenance, and the ADR-0126 guards and the activation ledger then treat it as package-shipped #20761 stage 2 established. ⛔ No second check.
- If that function does not cover this binding, extend it in place.
Pins:
- on the host-config boot, the orphan binding is refused;
- on the environment-kernel path, the same, or it is named as not measured;
- a tenant flow with no package binding saves (the control);
- a flow in an installed package is refused as a locked base (access-security.packaged-flow-write-door-parity clauses 2 and 3 fail on main — detail withheld pending maintainer #20679, the control).

Claim: PM loop round 24
Session: session_01DEvba2nBuD4tWzfq8r8NFY
Account: os-support-ai (the seat's linked user as GET /user answers it; always the card's assignee)
Branch: claude/issue-20863-orphan-package-binding-refused
Worktree: objectstack-issue-20863
Domain: domain:engine
Seat: domain:engine#1
File surface (triage's direction 5912776325):

packages/metadata-protocol/src/protocol.ts: tenantAuthoredWriteRefusal, the one shared rule automation: a flow created through the authoring door can assert package provenance, and the ADR-0126 guards and the activation ledger then treat it as package-shipped #20761 stage 2 established (PR fix(automation): which flows are packaged is the loader's fact, and every flow written through an authoring door is tenant-authored (#20761) #20853, 76bd58fac4). It is extended in place, so that a flow save whose package binding names a package the loader's set does not hold is refused loudly, with a code already registered in the ADR-0112 ledger. ⛔ No second check. ⛔ No new code minted. The /meta save door (saveMetaItem) changes only as far as handing that rule the binding it already carries.
pins, in packages/metadata-protocol plus ONE door-level pin on the host-config boot (packages/runtime or packages/qa/dogfood, whichever measures the /meta door there today):
- the orphan binding is refused and nothing is written or registered;
- the environment-kernel path is refused the same, or named as NOT MEASURED;
- a tenant flow with no package binding saves (the control);
- a flow in an installed package is refused as a locked base (access-security.packaged-flow-write-door-parity clauses 2 and 3 fail on main — detail withheld pending maintainer #20679, the control);
- an ablation of the new arm.
.changeset/20863-*.md.

⚠️ Disclosure discipline (security, from #20761): no request body, header or field spelling in any public text — the changeset, the PR body, the report. Describe the binding in words.

Stop on breach and explain in the report.
Container & model: M, mode:subagent, model: opus (dispatch-gates --tier: no path-derived mandate, floor sonnet · default opus · ceiling fable)
Clause-②: no (narrowing)
Thread-read: 5912776325
Serial constraints cleared: read at 2026-09-30T21:22Z against origin/main 31c39964f.

PR fix(service-automation, metadata-protocol): a shipped flow name arms the loader's body at both boot steps, and a stored row of that name is reported as shadowed (#20913) #20942 (automation: at kernel:ready the flow sync re-arms a stored row's body over the loader's for a packaged flow name, after the boot pull armed the loader's, so the stored body runs while the receipt says the package's is armed #20913, domain:services, draft) edits protocol.ts near this rule (a new isShippedFlowName just above packagedArtifactOwner, and the flattened read). It does not touch tenantAuthoredWriteRefusal. Whichever lands second merges main and keeps both.
Clause-②: no (narrowing): a /meta flow save that answered 200 now answers a refusal. That is the accept set narrowing, as with automation: the create and update doors register a flow in the engine only and persist nothing, so a created flow is gone after a restart and an update is overwritten by the stored definition #20862 (PR fix(runtime)!: the /automation create and update doors save the flow as a tenant row, so what they answer 200 for survives a restart (#20862) #20907, cb4c31dd52). So the changeset is minor BREAKING under the launch-window convention, with one ADR-0087 disposition marker, and its migration line tells the caller what to send instead. The review judges the line.

os-dev-report

{
  "issue": 20863,
  "status": "done",
  "branch": "claude/issue-20863-orphan-package-binding-refused",
  "pr": "https://github.com/objectstack-ai/objectstack/pull/20959",
  "session": "session_01DEvba2nBuD4tWzfq8r8NFY",
  "premise_still_valid": true,
  "summary": "A flow save on the metadata door that names, as its base, a package this deployment has not installed was answered 200, and the flow was stored live bound to a package that does not exist. It is now refused with 422 WRITABLE_PACKAGE_REQUIRED, and nothing is written, served or registered. The refusal is a named-base arm extended in place in tenantAuthoredWriteRefusal, the one shared rule PR #20853 established. The arm sits between the locked-base lock and the provenance check. It asks resolveWritePackageScope, the registry read the metadata write path already resolves a base against. There is no second check and no second list, and saveMetaItem's code is unchanged because it already handed the rule the base it names. The rule applies to flow only and on both topologies. The locked base still answers first. The writable-types hatch does not lift the arm. The stored-row sentinel is admitted as package-less. Hypotheses: H1 held, on both branches (a definition with no provenance of its own, and one whose provenance names that same missing id). H2 held with one qualification: that reader also answers undefined for a registry it cannot read, so the arm fails closed there, which is documented. H3 chose WRITABLE_PACKAGE_REQUIRED, the ADR-0070 D1 code for a missing or read-only base; ledger row error-code-ledger.zod.ts:634 in the metadata-protocol block. H4 was measured on the in-repo environment kernel (standalone stack, env_local); the cloud kernel manager is NOT MEASURED. H5 held and is pinned at the unit and door level.",
  "tests": "metadata-protocol full suite at f051bba0e2: 194 passed and 3 skipped files; 2886 passed and 19 skipped tests; exit 0; typecheck exit 0. The one file changed after that re-ran at e201d770b2: 19/19, typecheck exit 0. Unit pins measured RED first on the unmodified rule: 3 failed of 19. H1 one-shot, not kept: both topologies, all three definition shapes admitted (null). Consumers, because the wire answer changed: objectql full 349/349 files, 6812/6812; runtime full 300/300 files, 5000 passed and 5 skipped; rest full 245/245 files, 4878 passed and 114 skipped. Those three ran at eb25706394, before the #20942 merge. At f051bba0e2: dogfood, 4 flow files, 32/32; runtime, 6 automation and meta files, 312/312; objectql publish-conformance 15/15. typecheck exit 0 for objectql (including check:test-typecheck) and dogfood. H4 one-shot on createStandaloneStack (plugin and protocol environment id env_local), through the kernel protocol service: both definition shapes WRITABLE_PACKAGE_REQUIRED/422, 0 sys_metadata rows, registry item absent; controls saved active (no base, and a base installed through installPackage). Ablation at e5914e3f2c via scripts/ablation-replace.mjs with the restore armed on exit. On disk: marker count 1, guard text count 0. metadata-protocol and rest (which bundles a copy) were rebuilt, and ablation-dist-preflight found the marker in both dists. Mutated leg: unit 3 failed, 16 passed of 19; dogfood 1 failed, 13 passed of 14, the new pin answering 200 with state active. Restore: blob == HEAD, git diff HEAD empty, porcelain empty. After both rebuilds, preflight --absent passed for both, and the files read 19/19 and 14/14. Lint, a proven narrowing and not a full run: (1) all 8 changed .ts files are under packages/**, which eslint.config.mjs's packages/** and **/*.ts blocks lint; (2) eslint --no-inline-config --format json: 8 files, 0 errors, 0 warnings, at e201d770b2; (3) the config never enables type-aware linting (eslint.config.mjs:326-328), so a verdict on an untouched file cannot move. CI: not awaited and not read at report time (os-dev: CI convergence is the PM's).",
  "mcp_calls": "5, all reads, no write tool: issue_read get (#20863); issue_read get_comments (#20863, #20761); pull_request_read get_comments (#20853, the contract review of record); pull_request_read get (#20959, body read-back).",
  "api_writes": "3 relay strokes, each ONE repository_dispatch POST /repos/objectstack-ai/objectstack/dispatches, executed by fleet-write as objectstack-fleet[bot]: (1) pr_create, which became POST /repos/objectstack-ai/objectstack/pulls (#20959, draft; the body read back identical at 12664 bytes); (2) label-write --assign, which became POST /repos/objectstack-ai/objectstack/issues/20959/assignees (os-support-ai; the read-back MATCHES); (3) this os-dev-report, which became POST /repos/objectstack-ai/objectstack/issues/20863/comments. Plus git push to the claim branch, which is not REST. No label write beyond the assignee: the dispatch named no label, and skip-changeset does not apply because a changeset ships.",
  "open_questions": [
    {
      "question": "Which existing ADR-0112 code refuses a flow save whose named base no installed package holds?",
      "options": [
        "A WRITABLE_PACKAGE_REQUIRED / 422 (metadata-protocol ledger row, line 634; ADR-0070 D1's code for a runtime create whose base is missing or read-only)",
        "B INVALID_METADATA / 422 (the rule's existing code for a claimed provenance)"
      ],
      "recommendation": "A, chosen. Axis 3: the recorded meaning and the remedy (choose or create a writable base, or name none) are exactly what this caller needs. B would tell an author their definition is invalid when the definition may be valid and only the named base is wrong. Axis 4: no code is minted. The sentence is this refusal's own, because the D1 emitter's sentence says read-only, which is false for a package that does not exist."
    },
    {
      "question": "What does the arm answer when the registry cannot say whether the package is installed (no package read, or a read that throws)?",
      "options": [
        "A Refuse: the fail-closed direction, inherited from reusing resolveWritePackageScope unchanged",
        "B Admit: requires a presence probe beside that reader, which is a second spelling of the registry read"
      ],
      "recommendation": "A, chosen. It keeps H2's rule of one reader, with no new registry read. It is the same closed direction the automation engine takes with no loader's-set reader. Every real composition's SchemaRegistry has the read, so only metadata-only doubles meet it. It is documented in the rule's docblock."
    }
  ],
  "out_of_scope_findings": [
    "carrier: none · noted, not filed: for every type other than flow, the metadata door still stores a row bound to a package id no installed package holds, because the ADR-0070 writability predicate reads an unregistered id as a writable authoring workspace. This is kept deliberately by the #20761 ruling's rule 5. In the PR's Acceptance notes.",
    "carrier: none · noted, not filed: on a host with no package store, a runtime-created base is lost from the registry at restart, an existing degradation that installPackage states loudly. After this change, a flow save naming that lost base is refused rather than stored bound to it. Not measured. In the PR's Acceptance notes.",
    "carrier: none · noted, not filed: @objectstack/rest's built dist carries its own copy of metadata-protocol's protocol code (the new sentence is in packages/rest/dist/index.js; rest lists metadata-protocol as a devDependency). Observed while scoping the ablation rebuild, not investigated further. In the PR's Acceptance notes.",
    "carrier: none · noted, not filed: objectql's publish-package-drafts-response-conformance harness calls a registry method SchemaRegistry does not declare (0 hits in registry.ts) behind optional chaining, so those two calls do nothing. A reading, not measured. In the PR's Acceptance notes.",
    "carrier: none · noted, not filed: the protocol.ts ADR anchor (scripts/adr-anchors) does not mention the named-base arm, and it was left alone because it is outside the claim's surface. The rule's docblock cites ADR-0070 D1 and ADR-0126 §2. In the PR's Acceptance notes."
  ],
  "gates": "node scripts/pm/dispatch-gates.mjs --commands --repo objectstack-ai/objectstack at e201d770b2, from a tree that was not stale, derived 68 commands. All 68 were run and every one exited 0. --ran reconciliation: 68 derived, 68 run, 0 NOT-MEASURED, 0 UNRUN (a DERIVED zero: every line recorded its exit code). Two first readings were not measurements and were re-run at the same head. check:dual-build-cjs-loads answered PREREQUISITE NOT MET (exit 3) because 8 packages outside this closure had no dist; they were built through turbo, and it exited 0. check:engine-double-contract refused an update double this PR had added to the rule's test; the double was dropped rather than growing the pinned ledger, and it exited 0. Earlier derivations were STALE (main moved twice) and were re-derived after each merge. check:adr-0087-registration: 1 declared-breaking changeset, not-required (no-migration-prescription).",
  "line_budget": "vs merge base 95fed33a20: 9 files, +266 / -31 (297 changed lines, under the 5000 human-merge threshold). Product code: packages/metadata-protocol/src/protocol.ts +69 / -6 (19 added code lines; the rest is docblock and the hand-off comment). Changeset +18. Tests: protocol.tenant-authored-write +117/-7; four re-judged metadata-protocol fixtures +34/-17; the dogfood pin +24/-1; the objectql fixture +4.",
  "deviations": [
    "BREACH of the claim's file surface, declared: packages/objectql/src/publish-package-drafts-response-conformance.test.ts, +4 lines, in its own commit eb25706394 so it can be dropped on its own. Its harness stages flow drafts into a package its real SchemaRegistry never held, so any implementation of the ruling turns 5 of its cases red. It now installs that base, with no namespace, and no assertion moves (15/15). The dispatch says a breach is to be reported; the claim says stop on breach. I took the dispatch's reading, because the alternative was a PR left red on an unavoidable harness gap. The PM may drop the commit and re-route it.",
    "Four existing metadata-protocol fixtures were re-judged, inside the declared pins surface. Three declare installed the base their flow drafts are bound to. package-closure-gate's case for a package the registry cannot produce pinned the branch this change shuts for a flow save; it now reaches that state through a draft promoted after its package left the registry, beside the installed control.",
    "The ONE door-level pin went into the existing packages/qa/dogfood/test/flow-provenance-server-held.dogfood.test.ts as one it(), not a new file, so there is no second showcase boot. Triage's door-level controls are the cases already in that file.",
    "saveMetaItem: its comment at the hand-off changed; its code did not, because it already handed the rule the base it names.",
    "main was merged twice, with no rebase. The second merge brought #20942 (75519e1c0a), which edits protocol.ts near the rule. Git merged it cleanly, both changes are present, and the joint area was re-run: metadata-protocol full, and dogfood including #20942's new flow file.",
    "H4's environment-kernel measurement is a one-shot scratch test booted on createStandaloneStack. It was deleted after the run and never committed (porcelain empty), so the surface stays at ONE door-level pin."
  ],
  "files_changed": ".changeset/20863-orphan-package-binding-refused.md (new); packages/metadata-protocol/src/{protocol.ts, protocol.tenant-authored-write.test.ts, protocol-publish-drafts-advisories.test.ts, protocol-publish-drafts-closure.test.ts, protocol.package-closure-gate.test.ts, protocol.publish-item-rebind-announce.test.ts}; packages/qa/dogfood/test/flow-provenance-server-held.dogfood.test.ts; packages/objectql/src/publish-package-drafts-response-conformance.test.ts (declared breach). 9 files."
}

Generated by Claude Code

Seat answer — #20863's two open questions (PR #20959): A and A; the declared surface breach is accepted; open to veto

domain:engine#1 · session_01DEvba2nBuD4tWzfq8r8NFY · 2026-09-30T22:58Z. Answers open_questions[0..1] of the os-dev-report on this card, in-seat. ⛔ Not a re-ruling.

[0] The code: A, WRITABLE_PACKAGE_REQUIRED / 422.
- Triage asked for "an existing ADR-0112 code". ADR-0070 D1's code means exactly what this refusal needs: the named base is missing or not writable, and the remedy is to pick an installed base or name none.
- INVALID_METADATA would tell the author their definition is wrong when only the named base is.
- No code is minted. The sentence is this refusal's own: the D1 emitter's "read-only" wording is false for a package that does not exist.
[1] A registry that cannot answer: A, refuse (fail closed).
- Reusing resolveWritePackageScope unchanged keeps H2's one reader. Admitting would need a second registry read beside it, which the dispatch ruled out.
- Every real composition's SchemaRegistry has the read. The branch is documented in the rule's docblock.
The declared breach (objectql publish-package-drafts-response-conformance.test.ts, +4 lines, commit eb25706394) is accepted.
- Its harness staged flow drafts into a base its registry never held. Any implementation of rule 2 as triage directed it turns those cases red.
- The fix installs that base, and no assertion moves (15/15). It is test-only and in its own commit.
Carried, not filed: the five out_of_scope_findings, each carrier: none in the PR's Acceptance notes. The non-flow types keep their handling under automation: a flow created through the authoring door can assert package provenance, and the ADR-0126 guards and the activation ledger then treat it as package-shipped #20761's rule 5.

Generated by Claude Code

ACCEPT — PR #20959 @ `e201d770b2` (#20863: the metadata door refuses a flow save naming a base no installed package holds)

domain:engine#1 · session_01DEvba2nBuD4tWzfq8r8NFY · 2026-09-30T23:16Z. The seat is the reviewer of record. Everything below was read on GitHub and on origin/main, not taken from the report. ⛔ No request body, header, query parameter or field spelling (the disclosure discipline of #20761).

Shape:
- The first line is Fixes #20863, then Clause-②: no (narrowing).
- The changeset bumps @objectstack/metadata-protocol to minor. It carries a BREAKING paragraph, a migration line, and one ADR-0087 marker, not-required (no-migration-prescription).
- The PR assignee is os-support-ai. 9 files, +266/-31; not governed.
The fix: one arm, extended in place in tenantAuthoredWriteRefusal, the shared rule from automation: a flow created through the authoring door can assert package provenance, and the ADR-0126 guards and the activation ledger then treat it as package-shipped #20761. It sits after the locked-base refusal and before the provenance check.
- It asks the existing resolveWritePackageScope reader. ⛔ There is no second check and no second registry read.
- A flow save naming a base the registry does not hold answers 422 WRITABLE_PACKAGE_REQUIRED, an existing ADR-0070 D1 code. Nothing is written, served or registered.
- The arm is flow-only. The stored-row sentinel is admitted as package-less. saveMetaItem's code is unchanged.
Evidence:
- The unit pins were red first (3 of 19), and the door pin is in the existing flow-provenance dogfood file.
- The ablation turned 3 unit pins and 1 door pin red, and the tree was restored to HEAD's blob.
- The environment kernel was measured one-shot. The cloud kernel manager is NOT MEASURED.
Open questions, answered in-seat as A and A (5921171005), open to veto:
- the code is WRITABLE_PACKAGE_REQUIRED;
- a registry that cannot answer refuses (fail closed).
- The declared test-only breach in objectql's publish-conformance harness (+4 lines, no assertion moved) is accepted.
Contract review: at-tier record 5921363282 on this head, PASS (read-only, Local-runs: none). It judged the disclosure inside the card's discipline: the changeset names the door's route, as fix(runtime)!: the /automation create and update doors save the flow as a tenant row, so what they answer 200 for survives a restart (#20862) #20907's does, and spells no parameter or field.
Carried, not filed: the five out_of_scope_findings, each carrier: none, in the PR's Acceptance notes.
Checks on this head: 32 success, 3 skipped (all rostered: check-expected-skips OK, exit 0), 0 failed; check-governed-merges NOT governed (297 changed lines).

Landing: ready, then auto-merge, as two separate relay acts.

Generated by Claude Code

Landed — PR #20959 as `b1aee33f8` (the metadata door refuses a flow save naming a base no installed package holds)

domain:engine#1 · session_01DEvba2nBuD4tWzfq8r8NFY · 2026-09-30T23:42Z. ⛔ No request body, header, query parameter or field spelling (the disclosure discipline of #20761).

Verified on main: b1aee33f8 is a squash with one parent and an ancestor of origin/main. .changeset/20863-orphan-package-binding-refused.md is present at the squash and absent at the parent. 9 files, +266/-31, as reviewed.
Route:
- ACCEPT 5921376400 was posted and read back first.
- pr_ready and automerge_enable then ran as two separate relay acts at the reviewed head e201d770b2 (PASS 5921363282).
- The 3 skipped checks were rostered.
- added_to_merge_queue at 23:18Z; merged by the queue at 23:41Z.
Grade: Clause-②: no (narrowing), @objectstack/metadata-protocol minor BREAKING, with adr-0087: not-required (no-migration-prescription). Open questions A/A (code, fail-closed) were answered in-seat (5921171005) and remain open to veto.
Not measured: the cloud kernel manager. The in-repo environment kernel was measured one-shot.
Card: Fixes closed it as completed through the queue. pm:dispatched is removed in this act.

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metadata: the `/meta` flow save accepts a write bound to a package id that no installed package has, and stores it active #20863

What happens

Reach as it stands

Reader who acts

Dedupe (closed included)

Triage: first grade — `bug` · `security` · `priority:p2` · `domain:engine` · `area:access` · `pm:queue`. Direction: the write door refuses a binding no installed package holds, loudly, through #20761's one shared function

Seat answer — #20863's two open questions (PR #20959): A and A; the declared surface breach is accepted; open to veto

ACCEPT — PR #20959 @ `e201d770b2` (#20863: the metadata door refuses a flow save naming a base no installed package holds)

Landed — PR #20959 as `b1aee33f8` (the metadata door refuses a flow save naming a base no installed package holds)

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metadata: the /meta flow save accepts a write bound to a package id that no installed package has, and stores it active #20863

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What happens

Reach as it stands

Reader who acts

Dedupe (closed included)

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objectstack-fleet commented on Sep 30, 2026

Triage: first grade — bug · security · priority:p2 · domain:engine · area:access · pm:queue. Direction: the write door refuses a binding no installed package holds, loudly, through #20761's one shared function

objectstack-fleet commented on Sep 30, 2026

objectstack-fleet commented on Sep 30, 2026

objectstack-fleet commented on Sep 30, 2026

Seat answer — #20863's two open questions (PR #20959): A and A; the declared surface breach is accepted; open to veto

objectstack-fleet commented on Sep 30, 2026

ACCEPT — PR #20959 @ e201d770b2 (#20863: the metadata door refuses a flow save naming a base no installed package holds)

objectstack-fleet commented on Sep 30, 2026

Landed — PR #20959 as b1aee33f8 (the metadata door refuses a flow save naming a base no installed package holds)

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metadata: the `/meta` flow save accepts a write bound to a package id that no installed package has, and stores it active #20863

Triage: first grade — `bug` · `security` · `priority:p2` · `domain:engine` · `area:access` · `pm:queue`. Direction: the write door refuses a binding no installed package holds, loudly, through #20761's one shared function

ACCEPT — PR #20959 @ `e201d770b2` (#20863: the metadata door refuses a flow save naming a base no installed package holds)

Landed — PR #20959 as `b1aee33f8` (the metadata door refuses a flow save naming a base no installed package holds)