fix(node)!: Gate agent-task reads behind visibility rules - #396
fix(node)!: Gate agent-task reads behind visibility rules#396euxaristia wants to merge 41 commits into
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…repo data list_tasks and get_task had no authorization at all: any anonymous caller could enumerate every task on the node, including another party's repo-less task, its ucan_token, and its payload (Gitlawb#268). Add task_visible, mirroring the repo read-visibility gate already used by the ref-updates feed: the delegator and assignee can always read their own task, a repo-scoped task follows that repo's normal visibility rules, and a task naming no repo (or a repo this node doesn't host) is visible only to its delegator/assignee. Both REST and GraphQL now route through the same collect_visible_tasks/get_visible_task collectors so the two surfaces cannot drift, and neither read path echoes ucan_token back, since the holder already received it via the create/claim response. Fixes Gitlawb#268
tasks_limit_ceiling_clamped_to_200 seeded 201 repo-less tasks and read them back anonymously, expecting all 200. That read is exactly the enumeration Gitlawb#268 closes, so the new visibility gate correctly returns none of them and the test went red. The clamp ceiling is what this test pins, not the gate, so query as the tasks' delegator, who can legitimately see all 201 rows. Refs Gitlawb#268
collect_visible_tasks loaded every repo on the node and every visibility rule in order to gate at most 200 tasks, so an anonymous request paid for the whole node's repo and rule set. Narrow both lookups to the repo ids the fetched page actually names, and skip them when no task names a repo. The deduped repo snapshot stays the source of truth for resolving a repo_id: it collapses mirror and canonical pairs and omits quarantined repos, and an id missing from it has to keep failing closed. Resolving ids straight from the repos table would surface exactly those withheld rows. Add GraphQL denial tests as well. Nothing pinned that the task resolvers delegate to the shared collectors, so a resolver that queried the database directly would not have gone red. Refs Gitlawb#268
…rors to AppError. Refs Gitlawb#268
…hQL pagination state. Refs Gitlawb#268
Canonicalize RFC 3339 timestamps in parse_after_cursor to handle URL-decoded spaces, reject mixed cursor alias families, gate complete_task and fail_task behind get_visible_task so unreadable tasks 404 instead of leaking existence with 403, and only flag incomplete when hitting candidate ceilings on full SQL batches. Refs Gitlawb#268
…eadable and 403 on non-assignee tasks. Refs Gitlawb#268
…legitimate cursors. Refs Gitlawb#268
Gate REST and GraphQL claim behind the same visibility check as complete and fail, refuse claim when another assignee already holds the task, and only broadcast publicly visible task events. Treat a full list page as incomplete when more candidates remain. Surface HTTP errors from CLI and MCP claim and complete helpers. Refs Gitlawb#327 Co-Authored-By: cairn-code <cairn-code@users.noreply.github.com>
A full visible page was flagged incomplete whenever the SQL batch was full, so the first page of any list with more than 200 candidates looked stalled. Align the GraphQL claim test with the visibility gate's not-found message. Refs Gitlawb#268
Review required tests that go red if the pre-assigned claim predicate or the anonymous announce gate is deleted, and incomplete must not stay true when the candidate stream is exhausted at the scan ceiling. Route claim, complete, and fail through AppError so closed-pool outages stay 503 and 404s match the read envelope. Refs Gitlawb#268
create_task stores the supplied assignee unchanged, so a raw SQL equality check drops a designated assignee who presents the other did:key form. Compare the normalized key so claim and filtered list agree with did_matches. Refs Gitlawb#268
- Add error_for_status() to cmd_create and task_create MCP tool - Update test_create_task_server_error to assert failure on 500 - Add migration v18 creating expression index idx_agent_tasks_assignee_key matching ASSIGNEE_DID_CASE_SQL - Add did:web:z6Mkfoo single-residual shape to parity boundary matrix Refs Gitlawb#327 # Conflicts: # crates/gitlawb-node/src/db/mod.rs
The task read path treated visibility, pagination, and error vocabulary as
separate edits, so each one broke where they met. Rework them as one contract.
A raw (created_at, id) cursor forced a choice between two broken options: it
could name the last visible row, and then a denied window longer than the
1,000-candidate scan budget was unpageable forever; or it could name the last
examined row, and then a denied read leaked the id and timestamp of a task
GET /tasks/{id} otherwise 404s. Continuation tokens remove the choice. They
carry the last examined candidate, so paging always advances a full scan budget
per request, and they are encrypted and authenticated under a node-derived key,
so the caller learns nothing from one and cannot forge one naming a row of
their choosing. Encryption is a synthetic-IV construction over the hmac/sha2
pair already used for webhook signatures, so it adds no dependency and needs no
randomness source.
Making the token the only accepted cursor also gives the ordering key one
domain. agent_tasks.created_at is TEXT and compared as TEXT, so a caller-typed
'...Z' and '...+00:00' denote one instant but sort differently, and a client
could silently skip or repeat same-time rows. The token carries the stored
string verbatim, so the value compared is always one the server wrote. The raw
after_*/cursor_* pairs are removed rather than kept alongside it, since a second
domain is the bug.
Separate the two facts the old single incomplete flag conflated: has_more says
candidates remain, incomplete says this page is short only because the
authorization scan hit its ceiling. Both REST and GraphQL now return has_more,
incomplete, and next_cursor from the shared collector, and REST echoes the limit
it actually applied so a clamped request is visible as clamped.
Have gl task list and MCP task_list follow next_cursor instead of issuing one
request: --limit 500 returned a successful but silently truncated 200 rows.
Following is bounded by a page cap and a no-progress guard, and a run stopped by
either reports an explicit incomplete result with a resume cursor.
Route claimTask, completeTask, and failTask through the same task_write_conflict
classifier the REST handlers use, via curated helpers in the graphql module so
the map_err source guard still holds. A claim race or stale finish reached
GraphQL clients as a generic database error while REST clients got an actionable
conflict; genuine sqlx faults stay opaque on both.
Refs Gitlawb#327
A short SQL batch means no rows exist past it, not that every row in it was examined. When the page filled mid-batch the collector treated the two as the same, marked the stream ended, and suppressed the continuation, so every row after the one that filled the page was unreachable. The equal-timestamp paging tests caught it: three rows with a limit of one returned only the first. Track how much of each batch was consumed and end the stream only when the whole of a short batch has been examined. Otherwise leave `has_more` to the probe row, which resumes from the last examined candidate. Refs Gitlawb#327
…der test A `--limit 0` reached the node, which clamped it to zero and answered with an empty page marked complete, so an invalid request read as proof that no tasks exist. Reject a non-positive limit in `fetch_tasks()`, the helper the CLI and MCP share, so the guard cannot drift between the two surfaces. `task_write_sql_faults_stay_opaque` did not exercise what it named. Dropping `updated_at` also broke the SELECT in `get_task()`, so the fault surfaced from the `get_visible_task()` pre-check through `graphql_app_err` and never reached `graphql_claim_conflict`. A `BEFORE UPDATE` trigger keeps every read valid and faults only inside `Db::claim_task`, and the test now also asserts that a write-time fault is not reclassified as a claim race. Refs Gitlawb#268
…utes
A continuation token names the last candidate a scan examined, not the last
row it returned, so it encodes how far that scan got under one caller's
visibility. The MAC bound the page filter but not the presenting identity,
so resuming a token as a different caller started the scan past rows that
caller was entitled to read and dropped them from the answer with nothing
to signal the loss. Bind the caller's normalized DID into the MAC, with
anonymous flagged absent rather than encoded as empty. Normalization goes
through normalize_owner_key so the two spellings of one did:key identity
bind identically, matching did_matches on the read path: a caller who
presents the other form of their own DID keeps their own page. A mismatched
token renders the existing single rejection message, so this adds no oracle.
GET /api/v1/tasks and GET /api/v1/tasks/{id} are anonymously reachable, and
the visibility gate costs a task lookup plus deduped-repo and
visibility-rule queries before it can return the opaque 404. An
unauthenticated prober therefore pays nothing while the node pays per
request, whether or not the id exists. Attach the per-IP limiter already
used on /ipfs/{cid}, configurable through GITLAWB_TASK_READ_RATE_LIMIT and
swept by the periodic task like every other per-key limiter.
Refs Gitlawb#268
The per-IP brake added for the task read routes covered only /api/v1/tasks*, so an anonymous caller reached the same collect_visible_tasks and get_visible_task gate over /graphql with no bucket at all. The fence had an open lane beside it. Carry the brake as GraphQL request data and debit it in the tasks and task resolvers rather than layering rate_limit_by_ip onto the GraphQL router: /graphql is one endpoint for every operation, so a router layer would charge unrelated queries and every mutation against the task-read bucket. Debiting per resolved field also prices an aliased query honestly, since ten aliased tasks fields run the gate ten times. Extract RATE_LIMIT_MESSAGE so the GraphQL surface, which cannot return a 429 status inside a 200 envelope, refuses with the same text the REST routes use. /graphql/ws serves the query root as well and stays unbraked; closing it needs a WebSocketUpgrade handler and is left for a follow-up. Refs Gitlawb#268 Refs Gitlawb#327
…ize assignee filter MAC
…more from visible rows - Cap aliased GraphQL task read fields per request using an atomic counter on TaskReadBrake (MAX_GRAPHQL_TASK_READS_PER_REQUEST = 5). - Derive has_more in collect_visible_tasks by scanning for bounded_limit + 1 visible rows, eliminating the un-gated keyset probe that could leak the presence of trailing denied tasks. - Add regression tests covering aliased GraphQL capping and trailing denied task has_more privacy. Refs Gitlawb#327
… batch boundary When candidate scanning reaches MAX_TASK_SCAN_CANDIDATES without finding a target_visible row and the final batch was full, probe the database for rows beyond the scan position so an exhausted candidate stream is not erroneously marked incomplete. Refs Gitlawb#327
The scan-ceiling branch of collect_visible_tasks settles has_more with an un-gated LIMIT 1 probe, so a caller can learn whether any row - readable or not - trails the position the scan stopped at. Withholding the probe does not remove that bit: enumeration past a denied window longer than one scan budget requires handing back a continuation, and following that continuation returns the same terminal page one round trip later. State what the probe discloses (one bit, only at server-chosen positions a full scan budget apart, reachable only through a MAC'd cursor, never a denied row's id, payload or ucan_token) and pin it end to end. Also correct the comment above the branch, which claimed has_more never comes from an un-gated probe while the code below it did exactly that. Refs Gitlawb#327
Optional IS NULL predicates kept the planner from using a created_at/id order, so every list_tasks_keyset batch could sort a growing match set before LIMIT. Dedicated per-domain SQL plus v28 indexes make the candidate ceiling a database bound. Refs Gitlawb#327
…sted limit. fetch_tasks asked for the remaining total, then appended every row on a valid-shaped page. A remote that sent more tasks than want could make gl and MCP expose more than --limit. Treat that page as protocol-invalid before any extra row is kept. Refs Gitlawb#327
…e-column indexes. Refs Gitlawb#327
Greptile SummaryThis PR gates agent-task reads across REST, GraphQL, subscriptions, and clients while adding protected keyset pagination and per-operation GraphQL task-read budgets.
Confidence Score: 5/5The PR appears safe to merge with no actionable correctness or security defects identified. The changed read paths consistently apply task-party and repository visibility, conceal sensitive task fields, preserve opaque denials, bind pagination state to callers and filters, and bound repeated work across REST and GraphQL.
|
| Filename | Overview |
|---|---|
| crates/gitlawb-node/src/api/tasks.rs | Centralizes task visibility, claim eligibility, bounded pagination, opaque read projections, and guarded event broadcasting. |
| crates/gitlawb-node/src/api/task_cursor.rs | Introduces confidential, integrity-protected continuation tokens bound to the caller and active filters. |
| crates/gitlawb-node/src/db/mod.rs | Adds keyset task queries, normalized assignee matching, conditional claim guards, supporting indexes, and scoped repository resolution. |
| crates/gitlawb-node/src/graphql/query.rs | Routes GraphQL task reads through the shared visibility collector, cursor contract, and task-read brake. |
| crates/gitlawb-node/src/graphql/mutation.rs | Applies opaque claim/read authorization and consistent conflict mapping to task mutations. |
| crates/gitlawb-node/src/graphql/mod.rs | Resets task field budgets per GraphQL operation while retaining the connection-level limiter. |
| crates/gl/src/task.rs | Adds bounded cursor traversal, protocol validation, loop detection, and explicit truncation reporting for task listings. |
| crates/gl/src/mcp.rs | Adapts MCP task listing to the paginated client result and surfaces truncation warnings. |
Sequence Diagram
sequenceDiagram
participant C as Client
participant A as REST / GraphQL
participant P as Cursor + Read Brake
participant D as Task Database
participant V as Visibility Gate
C->>A: List tasks(filter, cursor)
A->>P: Debit task-read budget
P-->>A: Allowed
A->>P: Verify caller/filter-bound cursor
P-->>A: Resume position
loop Bounded candidate scan
A->>D: Fetch keyset batch
D-->>A: Candidate tasks
A->>V: Filter by party/repository visibility
V-->>A: Visible subset
end
A->>P: Encode next position when needed
A-->>C: Visible tasks + pagination metadata
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Inline comments:
In `@crates/gitlawb-node/src/api/tasks.rs`:
- Around line 434-439: Update the task-claim validation around task_claimable’s
missing-record branch to call is_repo_quarantined(repo_id) before allowing the
fallback. Reject claims for quarantined repositories, while preserving open
claims for genuinely unresolved repositories, including slash-form mirror IDs.
In `@crates/gitlawb-node/src/server.rs`:
- Around line 53-64: Register the /graphql/ws route within the
optional-signature layer so signed requests are authenticated. Update
graphql_ws_handler to receive the optional AuthenticatedDid and insert it
alongside TaskReadBrake in the GraphQL WebSocket data, then add coverage proving
a signed WebSocket query can access the caller’s private task.
In `@crates/gl/src/mcp.rs`:
- Line 1071: Update the limit parsing in fetch_tasks so the default of 50
applies only when args["limit"] is absent or null; reject present values that
are not integers, including floating-point and string values, by returning an
error instead of silently falling back.
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…nd MCP limit parsing. Refs Gitlawb#395
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Inline comments:
In `@crates/gitlawb-node/src/server.rs`:
- Around line 970-978: Add a forged-signature rejection case alongside the
existing signed WebSocket authentication test: create a well-formed upgrade
declaring the trusted delegator DID but sign it with a different keypair, then
assert the upgrade is denied. Keep the existing valid signed connection as the
positive case and use the WebSocket authentication helpers around
connect_ws_signed to exercise DID-to-key verification.
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In `@crates/gitlawb-node/src/server.rs`:
- Around line 996-998: Update the forged response handling around
forged_stream.read so it accumulates data across reads until the complete HTTP
header terminator "\r\n\r\n" is received, then construct forged_resp and perform
the status check. Preserve the existing 401 validation while avoiding
assumptions that a single read returns all headers.
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Checked head ea5469b against origin/main. CI is green on the SHA (https://github.com/Gitlawb/node/actions/runs/33930967342/job/101209295281). I ran the task-read regression module and the GraphQL WebSocket auth/rate-limit tests locally on this head, and read the shared REST/GraphQL collectors. The anonymous and stranger read gate looks solid. One quarantine hole remains on task reads.
Findings
- [P2] Hard-drop quarantined-repo tasks before the delegator/assignee short-circuit
crates/gitlawb-node/src/api/tasks.rs:161
task_visiblereturns true for the delegator or assignee before it looks atrepo_idor quarantine state.get_visible_taskandcollect_visible_tasksonly calltask_visible, so a task on a quarantined canonical repo is still readable by its parties throughGET /api/v1/tasks,GET /api/v1/tasks/{id}, and GraphQLtasks/task.get_claimable_taskalready hard-drops quarantined repos at line 460; the read path does not. Ref-update feeds withhold quarantined rows even from the repo owner. Checkis_repo_quarantinedontask.repo_idbefore the party-match returns, and add a regression that quarantines a repo, seeds a task with that owner as delegator, then asserts REST 404 and GraphQL null on list/get.
Not an ask, recorded only: fail_task/failTask could mirror the visible-non-assignee tests that complete_task already carries; that is separate from this quarantine gap.
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Checked head 0c1d5e4 against origin/main. The quarantine read gap from round 1 is fixed: task_visible hard-drops quarantined repos before party checks, and quarantined_repo_task_withheld_from_owner_on_rest_and_graphql passes. I ran visible_tasks_tests (32/32) and a revert probe that turned the quarantine guard RED. A second-model pass on this head surfaced two items I want addressed before merge.
Findings
-
[P2] Fail closed for claim eligibility on mirror rows and unresolved canonical repo IDs
crates/gitlawb-node/src/api/tasks.rs:470
task_claimablereturnstruefor slash-form repo IDs and for canonical IDs with no local deduped record, so a signed stranger who knows an unassigned task ID can claim throughget_claimable_taskand receivetask_to_json, includingpayloadanducan_token. Read surfaces correctly hide mirror-repo tasks (mirror_only_repo_task_is_hidden_from_anonymous_reads), but the claim path treats those repo states as open. Seed an unassigned task on a mirror id or a nonexistent canonical repo id, POST/api/v1/tasks/{id}/claimas an unrelated DID, and assert opaque 404 instead of 200 with the task body. -
[P3] Document
GITLAWB_TASK_READ_RATE_LIMITbeside the other operator rate-limit knobs
crates/gitlawb-node/src/config.rs:715
The clap field help is present, but.env.exampleand the README rate-limit table listGITLAWB_IPFS_RATE_LIMITand peers without this knob. Add the variable with default 1200 and the same0disables semantics the code implements.
Not an ask, recorded only: the scan-ceiling continuation probe at tasks.rs:374-387 is deliberate bounded disclosure pinned by scan_ceiling_continuation_discloses_only_a_terminal_page; I am not asking to remove it on this round.
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I found issues that need to be addressed before this is ready.
The runtime work for #395 / #268 is on this head: REST and GraphQL task reads share collect_visible_tasks / get_visible_task, reads omit ucan_token, quarantine drops before party checks, /graphql/ws is under optional_signature, task-read IP brakes are wired, and gl / MCP follow opaque cursors with hostile-node caps. What did not move with that change is the operator-facing contract. Both findings below are the same miss: clap, main.rs, collectors, and tests describe the new gate; README.md, .env.example, and SECURITY.md still describe the old hole or omit the new brake. That is why this is still open after the code rounds. It is not because claim, cursors, WebSocket auth, or quarantine need another pass.
Please treat this comment as the closed set for merge. Fix the two docs items in one commit. Do not retouch working gates to “look complete.”
Close-out (so the next commit can be the last)
Do:
- Add
GITLAWB_TASK_READ_RATE_LIMITnext to the other per-IP rate-limit knobs in the README settings table and.env.example, copying the semantics already implemented (default 1200,0disables, keyed viaGITLAWB_TRUSTED_PROXY). - Rewrite the published “task listings are not repository-gated / include a UCAN token” sentences in
SECURITY.mdand the README known-limitations bullet so they match gated, redacted reads. Leave pin and anchor listing limitations in those same sentences.
Do not:
- Fail-closed unassigned claim for slash-form mirror ids or unresolved canonical repo ids. #395 asked to decouple open-claim eligibility from read visibility.
task_visiblealready withholds mirror ids from reads;task_claimableleaves unassigned claim open when no local canonical row can runlistable_at_root. CodeRabbit’s accepted claim-side fix was quarantine-deny plus preserve-open for unresolved remotes, including slash-form. Repo-less open claim is pinned byopen_repoless_task_create_claim_complete_lifecycle. Hosted private repos already 404 viaclaim_task_on_private_repo_task_returns_404. Returningpayload/ucan_tokenon a successful claim is the #268 delivery path, not a leftover list leak. Recoupling those claim paths to the read 404 is out of scope and will bounce. - Change the 1200 default, the limiter wiring, REST vs GraphQL brake placement, or
0disables. - Put
ucan_tokenback on GET list/get or GraphQLtasks/task. - Rewrite pin, anchor, sparse-clone, or “visibility cannot retract already-announced content” limitations.
- Change the
[0, 200]tasklimitclamp, cursor MAC, scan-ceiling probe, or CLI/MCP caps. Those are either documented here or owned by #401 / #405. - Reopen WS auth, forged-signature tests, MCP integer
limit, or the preassigned SQL claim guard. Those are done on this head.
Merge readiness
-
Overlapping work exists but does not replace a review of this head. Closed #327 is the prior attempt at the same title. Open #275 also honors pre-assigned assignees on claim; this branch already includes the SQL
(assignee_did IS NULL OR normalized key)guard and opaque 404 for strangers. Open #401 and #405 retarget #399 (tasklimitclamp); this branch clamps to[0, 200]and documents GraphQL negatives as clamp-to-zero, while those PRs want[1, 200]. Resolve or close the duplicates after this lands so they do not fight the collector. -
Mergeable against current
main(bfc44f926d08c0bf774e2c05dd76b245871294f1); no rebase drift. CI on head0c1d5e4df255a71e6958b059801ffb7c84a4e3d9is green (fmt/clippy, tests, audit, MSRV, Docker smoke). Merge is blocked on review.
Findings
-
[P3] Document
GITLAWB_TASK_READ_RATE_LIMITbeside the other operator rate-limit knobs
crates/gitlawb-node/src/config.rs:715
README.md:414
.env.example:273Root cause: the PR added a new operator security knob (
task_read_rate_limit, envGITLAWB_TASK_READ_RATE_LIMIT, default 1200,0disables) and wired it on RESTGET /api/v1/tasks/GET /api/v1/tasks/{id}plus GraphQL/WSTaskReadBrake, with a startup warning inmain.rswhen it is0. The catalogs operators actually copy from were not updated..env.exampleand the README “Important node settings” table already listGITLAWB_IPFS_RATE_LIMIT,GITLAWB_CREATE_RATE_LIMIT,GITLAWB_PEER_WRITE_RATE_LIMIT, andGITLAWB_SYNC_TRIGGER_RATE_LIMIT. An operator grepping those files cannot discover, tune, or knowingly disable the task-read brake, including that0turns it off.Please add the variable in both places, next to
GITLAWB_IPFS_RATE_LIMIT, with the contract the code already implements:- Default 1200 requests per client IP per hour (above the
/ipfs600 budget because a list page plus per-task reads is a normal client pattern). 0disables.- Keyed on the resolved client IP via
GITLAWB_TRUSTED_PROXY, same as the sibling brakes. - Applies to the anonymous task-read routes (
GET /api/v1/tasks,GET /api/v1/tasks/{id}) and the GraphQL/WS task-read brake that shares that budget.
Copy the clap comment at
config.rs:706-714into.env.examplethe way the IPFS/create/peer blocks are written. One README table row matching theGITLAWB_IPFS_RATE_LIMITrow shape is enough.Do not change the default, the limiter, REST-vs-GraphQL layering, or any other rate-limit knob. No code change is required. After the edit,
rg GITLAWB_TASK_READ_RATE_LIMIT README.md .env.exampleshould hit both files. - Default 1200 requests per client IP per hour (above the
-
[P3] Align published security limitations with gated task reads
SECURITY.md:76
README.md:72Root cause: this PR closed the #268 / #395 task-read hole (visibility collectors + no
ucan_tokenon read projections) but left the Known Limitations text that existed to disclose that hole. Operators readingSECURITY.mdor the README limitations list are still told the old exposure is live. The three-dot diff did not include those files; the code change made the published sentences false, so this PR owns the update.Two sentences, one fact:
SECURITY.md:76currently:GET /api/v1/tasks,/api/v1/ipfs/pins, and/api/v1/arweave/anchorsare not repository-gated. Task records include a UCAN token; pin and anchor listings expose object and ref metadata.README.md:72currently: task, IPFS-pin, and Arweave-anchor listings are not repository-gated; …
On this branch,
GET /api/v1/tasks,GET /api/v1/tasks/{id}, and GraphQLtasks/taskgo throughcollect_visible_tasks/get_visible_task. REST reads use the projection that omitsucan_token(task_to_jsonis the write/claim path). Pins and anchors are unchanged.Please rewrite only the task-read half of those two sentences so they say task list/get is repository/task-gated and does not include
ucan_token. Keep the pin and anchor clauses, the sparse-clone withheld-path note, and the “visibility cannot retract already-announced content” note exactly as they are. Do not expandSECURITY.mdinto a design doc, do not mention claim, and do not claim pins/anchors are gated.Example shape for
SECURITY.md:76(wording can vary; the facts cannot): task list/get (REST and GraphQL) is gated by the same visibility collectors as other reads and omitsucan_token;/api/v1/ipfs/pinsand/api/v1/arweave/anchorsare not repository-gated and still expose object and ref metadata.Example shape for
README.md:72: drop “task” from the ungated-listing list; keep IPFS-pin and Arweave-anchor listings, withheld path names, and the retractability clause.After the edit,
rg -n 'not repository-gated' SECURITY.md README.mdshould no longer attach that phrase to task reads. Leavedocs/OSS-READINESS-AUDIT.mdalone; it is a historical snapshot that already defers toSECURITY.md.
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Inline comments:
In @.env.example:
- Around line 278-280: Update the visibility-gate comment near the task
rate-limit configuration to distinguish GET /api/v1/tasks/{id}, which may return
an opaque 404 after get_visible_task, from GET /api/v1/tasks, which uses
collect_visible_tasks and returns a filtered page. Keep the rate-limit rationale
accurate for both route behaviors.
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Addressed the two findings in review 5123664742 in commit 41fef3a, and the follow-up wording correction in commit d9aded2.
These commits update documentation and CLI help wording only; runtime gates, defaults, and limiter wiring are unchanged. Local validation passed: the requested documentation searches, At the time of this update, CI on d9aded2 has passed formatting/clippy, audit, MSRV, Windows tests, and the other completed checks; stable/beta tests, the release build, and Docker smoke testing are still running. Current results: PR checks. |
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Checked head d9aded2 against origin/main. CI is green (12/12). The two docs findings from the prior round are addressed: GITLAWB_TASK_READ_RATE_LIMIT is in .env.example and the README settings table, and the SECURITY.md / README.md limitation sentences now describe gated task reads that omit ucan_token. I re-ran the prior load-bearing checks on this head: visible_tasks_tests (32/32) and the GraphQL WS auth tests (4/4). A revert probe that removes the quarantine check from task_visible goes RED on quarantined_repo_task_withheld_from_owner_on_rest_and_graphql, and a probe that adds ucan_token back to task_to_read_json goes RED on ucan_token_never_appears_in_read_responses. The gate, the quarantine drop, and the token omission are all load-bearing.
The visibility gate is sound across both surfaces: REST and GraphQL share collect_visible_tasks / get_visible_task, task_visible hard-drops quarantined repos before party checks, mirror repos and unhosted repo ids fail closed, and ucan_token appears only on the write/claim delivery path. The cursor is SIV-encrypted and caller/filter-bound, so a token holder cannot read or forge the position it carries. The WS handshake rejects forged signatures with 401, and the per-operation field budget reset is tested. One amplification issue on the anonymous read path, plus two minor doc gaps.
Findings
-
[P2] Batch the quarantine check in collect_visible_tasks
crates/gitlawb-node/src/api/tasks.rs:288
The scan loop calls db.is_repo_quarantined(repo_id) per distinct repo id per batch. With 200 distinct repos per batch and up to 5 batches (scan ceiling 1000), one anonymous GET /api/v1/tasks triggers up to 1000 individual SELECT quarantined FROM repos WHERE id = 1 queries. The route is anonymous-reachable (optional_signature), and the rate limit bounds frequency but not per-request cost. list_repos_deduped_by_ids already batches the repo record fetch but does not select the quarantined column, so the per-repo loop is the only unbatched query in the scan. Replace it with a single SELECT id FROM repos WHERE id = ANY(1) AND quarantined = TRUE populating the same HashSet, or add quarantined to the existing batched SELECT and RepoRecord. The gate order is preserved either way: task_visible checks quarantined_repos before the delegator/assignee short-circuit. -
[P3] Mention the GraphQL/WS budget sharing in the --help docstring
crates/gitlawb-node/src/config.rs:706
The clap field help describes only the two REST routes. .env.example and the README table both say the GraphQL/WS task-read brake shares this budget. An operator tuning from --help alone would not know that GraphQL tasks / task queries and WS task queries debit the same per-IP bucket. Add one sentence matching the .env.example wording. -
[P3] Update the stale /graphql/ws mounting comment in subscription.rs
crates/gitlawb-node/src/graphql/subscription.rs:14
The comment says /graphql/ws is "mounted outside the optional_signature layer." This PR moved it under optional_signature (server.rs:107), and graphql_ws_handler now threads Option<Extension> into connection data. The subscription resolvers do not read caller identity, so the write-side gating safety model is unchanged and correct. The comment is factually wrong about the mounting and could mislead a future developer into thinking the WS handshake is unauthenticated when it now rejects forged signatures with 401.
One process note, not a finding: open #401 and #405 retarget the task limit clamp to [1, 200] while this branch clamps to [0, 200]. Resolve or close those after this lands so they do not fight the collector.
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I found issues that need to be addressed before this is ready.
Treat this comment as the closed merge set for the runtime work on head d9aded2. The security and product contracts for #268 / #395 are in place on this head; what remains is one implementation gap in the list scanner, plus two maintainer-doc updates that should have landed with the same operator-facing pass that updated README and .env.example. Please address only the three findings below in one follow-up commit. Do not reopen claim eligibility, cursor semantics, WS auth wiring, quarantine gate order, rate-limit defaults, or limit clamps to “look complete” — those paths are load-bearing and tested.
What is already verified on this head
- REST and GraphQL task reads share
collect_visible_tasks/get_visible_task; reads omitucan_token. - Quarantined repos are hard-dropped before delegator/assignee short-circuit in
task_visible. /graphql/wsis underoptional_signature; forged signatures get HTTP 401; authenticated WS queries can read private tasks.- Open-claim eligibility remains decoupled from read visibility for unassigned tasks (#395); mirror/unhosted claim behavior is intentional, not a defect.
GITLAWB_TASK_READ_RATE_LIMITis documented in README and.env.example; SECURITY/README limitation text matches gated reads.- CI: 12/12 checks green on
d9aded2ca0957d4c34e04d2f41a608220342a5a6.
Revert probes on this head go red when quarantine is removed from task_visible or when ucan_token is restored on read projections — the gates are load-bearing.
Why review kept returning (and why this list is short)
This PR is large (~7k lines) and touched every layer of one contract at once: visibility collectors, opaque cursors, rate limits, GraphQL/WS auth, CLI/MCP pagination, and operator docs. That shape naturally produces drip review unless each round closes a single surface completely:
-
Security and product rounds came first. Early passes correctly focused on visibility holes (#268), claim vs read semantics (#395), cursor binding, WS authentication, and MCP parsing. Those required code changes across
tasks.rs,server.rs,task_cursor.rs, andgl/. Each fix shifted behavior that later reviewers re-read from scratch. -
Operator docs lagged the code. The runtime gained
GITLAWB_TASK_READ_RATE_LIMITand changed what SECURITY.md must say about task reads, but the first doc pass updated README/.env.exampleonly. Reviewers correctly blocked merge until those files caught up (jatmn round). That round is done ond9aded2, but the same operator contract was not copied into clap--helpandAppStatefield docs — a partial doc pass leaves a second doc-only round. -
Routing changes outpaced comments. Moving
/graphql/wsunderoptional_signaturewas the right fix, but theref_updatesmodule comment still describes the pre-change mount order (accurate on merge-basemain, wrong on this head). Stale comments invite the next reviewer to re-litigate WS auth as if it were still broken. -
A new hot path was added without matching an existing batching pattern. Quarantine enforcement in
collect_visible_taskscorrectly callsis_repo_quarantinedper repo, but the sibling ref-update collector and the batchedlist_repos_deduped_by_idscall in the same loop already show the intended “one round trip per batch” shape. The per-repo loop is the last unbatched query in that scan — easy to miss in a diff this size, but it is the remaining runtime issue. -
Automated and parallel reviewers re-raise intentional choices. Mirror/unhosted open claim, node-local cursors, GraphQL
TaskPageTypebreaking shape, and anonymous publish gating fortask_eventsare design decisions pinned by tests and maintainer direction. Treating each automated comment as a new merge blocker would never end.
Root cause for authors on contracts like this: when a PR changes behavior, document every operator entry point in one commit (--help, AppState comments, README, .env.example, SECURITY) using the same sentence template; when a PR changes routing, grep for stale mount/auth comments in the same commit; when a PR adds per-row DB work inside a public list scanner, compare against the nearest sibling collector (events.rs) before merge.
Merge readiness
- Mergeable against current
main(bfc44f926d08c0bf774e2c05dd76b245871294f1); no rebase drift observed. - All 12 required PR checks passed on head
d9aded2. - Open #401 and #405 retarget task
limitclamp to[1, 200]while this branch uses[0, 200]. Resolve or close those after this lands; do not fold that product choice into this close-out commit. - Prior jatmn documentation findings are addressed on this head.
Findings
[P2] Batch the quarantine check in collect_visible_tasks
crates/gitlawb-node/src/api/tasks.rs:281-300
crates/gitlawb-node/src/db/mod.rs:1642-1662 (batched repo fetch — extend or mirror)
What happens today
Inside the while scanned < MAX_TASK_SCAN_CANDIDATES loop, each keyset batch:
- Dedupes
repo_idvalues from up to 200 tasks (referenced). - Loops
referencedand awaitsdb.is_repo_quarantined(repo_id)— oneSELECT quarantined FROM repos WHERE id = $1per distinct id. - Then calls
list_repos_deduped_by_ids(&referenced)andlist_visibility_rules_for_repos— already batched.
With MAX_VISIBLE_TASKS = 200 per batch and MAX_TASK_SCAN_CANDIDATES = 1,000, a single anonymous GET /api/v1/tasks or GraphQL tasks query can issue up to 1,000 quarantine lookups. GraphQL aliases debit the same per-IP bucket per field but still run the full collector per field (capped at 5 fields/request). GITLAWB_TASK_READ_RATE_LIMIT limits requests per hour, not queries per request.
Root cause
Quarantine was added correctly to the visibility gate (task_visible checks quarantined_repos before party match) but implemented with the convenient single-row helper instead of aligning with:
api/events.rs:66—list_quarantined_repos()once per request for ref updates, or- the batched
list_repos_deduped_by_idscall immediately below in the same loop.
This is not a missing security gate; it is amplification on a public read path introduced by this PR’s quarantine enforcement.
Requested outcome (pick one; do not change gate semantics)
Option A (preferred — extends existing batch): Add quarantined to the SELECT in list_repos_deduped_by_ids (or add Db::quarantined_ids_among(&[String]) -> HashSet<String> used only here). Build quarantined_repos from rows where quarantined == true. Drop the for repo_id in &referenced loop entirely.
Option B: One query per batch: SELECT id FROM repos WHERE id = ANY($1) AND quarantined = TRUE with referenced as the array bind.
Invariants to preserve (do not drift)
task_visiblemust still test quarantine before delegator/assignee short-circuit (tasks.rs:167-170).get_visible_tasksingle-repo quarantine early-return stays as-is.- Do not switch to loading all quarantined repos on every list request unless you measure repo-table size; batching to
referencedids is enough.
Verification
- Existing
visible_tasks_testsandquarantined_repo_task_withheld_from_owner_on_rest_and_graphqlmust stay green. - Add or extend a test that seeds many distinct quarantined repo ids on one page and asserts behavior unchanged (optional: count DB round-trips in a unit test if the repo has a pattern for that).
[P3] Complete the operator contract for GITLAWB_TASK_READ_RATE_LIMIT
crates/gitlawb-node/src/config.rs:706-716
crates/gitlawb-node/src/state.rs:326-332
What happens today
Runtime debits one task_read_rate_limiter for:
- REST:
GET /api/v1/tasks,GET /api/v1/tasks/{id}viarate_limit_by_ipontask_read_routes. - GraphQL HTTP:
TaskReadBrakeingraphql_handler(server.rs:45-49). - GraphQL WS: same limiter/key in
graphql_ws_handler(server.rs:65-68), per-operation field budget reset inTaskReadBrakeExtension(graphql/mod.rs:115-130).
README (.env.example:285, README.md:415) already says GraphQL/WS share the budget. Clap --help and AppState::task_read_rate_limiter doc comment name only the two REST routes and say the limiter is “layered on task_read_routes via rate_limit_by_ip,” which is incomplete for GraphQL/WS.
Root cause
Operator-facing text was updated where jatmn explicitly asked (README + .env.example) but not at the other two places operators and maintainers actually read when tuning (gitlawb-node --help, rustdoc on AppState). Partial doc passes cause a second review round for the same knob.
Requested outcome
Copy the GraphQL/WS sharing sentence from .env.example:285 into:
- The clap field doc on
task_read_rate_limitinconfig.rs(after the REST route description). - The
task_read_rate_limiterfield comment instate.rs(note shared limiter across REST + GraphQL/WS, not onlytask_read_routes).
Template (wording may vary; facts must not):
The same per-IP hourly budget applies to GraphQL
tasks/taskqueries and WebSocket task queries viaTaskReadBrake.
Do not change
- Default 1200,
0disables,GITLAWB_TRUSTED_PROXYkeying, limiter wiring, or REST vs GraphQL layering.
Verification
rg 'GraphQL/WS' README.md .env.example crates/gitlawb-node/src/config.rs crates/gitlawb-node/src/state.rsshould hit all four surfaces.
[P3] Fix stale /graphql/ws mounting comment in subscription.rs
crates/gitlawb-node/src/graphql/subscription.rs:14-22
crates/gitlawb-node/src/server.rs:103-107
What happens today
The ref_updates subscription doc says /graphql/ws is mounted outside optional_signature and the resolver has no caller identity. On merge-base main that was true (/graphql/ws was registered after the auth layer). On this head, graphql_routes registers /graphql/ws before .layer(optional_signature), so signed handshakes are verified and AuthenticatedDid can be inserted into WS connection data. Forged-signature rejection and authenticated private-task query tests pin this.
The subscription resolver still does not read caller identity or filter per subscriber — same as before. Safety still rests on write-side gating (announce for ref updates, announce_task_event for tasks).
Root cause
A routing fix landed without updating the module-level comment that future readers use as the security model spec. That comment now asserts false facts about mounting and implies WS auth was never added.
Requested outcome
Rewrite the first two sentences of the ref_updates doc comment to state:
/graphql/wsis underoptional_signature; signed upgrades attachAuthenticatedDidto connection data.- Subscription resolvers still do not gate per subscriber; visibility safety remains on the write side (keep the existing
if announce/announce_task_eventinvariant paragraph).
Do not change
- Subscription relay logic,
announce_task_eventanonymous gate, or WS handler wiring. - Do not add per-subscriber filtering in this close-out — that would be a product change, not a comment fix.
Verification
- Comment should not contain “mounted outside the
optional_signaturelayer.” server.rs:105-107and the updated comment should agree.
Close-out — do not expand scope
Do in the one follow-up commit:
- Batch quarantine lookup in
collect_visible_tasks(finding 1). - Align clap +
AppStatedocs with README/.env.examplefor the shared task-read budget (finding 2). - Fix the
subscription.rsmounting/auth comment (finding 3).
Do not (will bounce or reopen settled rounds):
- Fail-close unassigned claim for mirror ids or unresolved canonical repo ids.
- Change
GITLAWB_TASK_READ_RATE_LIMITdefault, wiring, or disable semantics. - Put
ucan_tokenback on GET list/get or GraphQL read types. - Rewrite pin/anchor/sparse-clone limitations in SECURITY.md.
- Change
[0, 200]limit clamp, cursor MAC, scan-ceiling probe, or MCP/CLI page caps (#401 / #405 own limit semantics). - Add per-subscriber filtering to
task_eventsorref_updatessubscriptions. - “Fix” node-local cursors for load-balanced deploys in this PR (document operationally elsewhere if needed; not a merge blocker here).
After these three items, the runtime contract for #268 / #395 on this branch is complete from my review. Further rounds should be reserved for new head regressions, not re-argument of intentional #395 claim semantics or breaking GraphQL pagination shape.
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One P3 documentation item from my previous closed merge set remains incomplete. The requested quarantine batching and subscription mounting-comment changes are present, and the configuration comment now describes the shared budget. The outstanding change is the corresponding sentence in AppState.
This is the complete requested follow-up from this review. I am not asking for another runtime, security-policy, or test-hardening round.
Findings
[P3] Complete the previously requested shared-budget sentence in AppState
crates/gitlawb-node/src/state.rs:326-332
What is incomplete
My previous review explicitly named two locations for the same documentation correction: the task_read_rate_limit configuration documentation and the AppState::task_read_rate_limiter field comment. The configuration comment now says that GraphQL tasks / task queries, including WebSocket operations, share the per-IP budget with REST task reads. The state comment still describes only the REST routes and says the limiter is layered on task_read_routes through rate_limit_by_ip.
The runtime already shares this limiter. Both graphql_handler and graphql_ws_handler pass a clone of state.task_read_rate_limiter through TaskReadBrake, and the task-query resolvers debit it. README and .env.example also describe this sharing. The missing sentence therefore leaves the documentation at the state field incomplete; it does not demonstrate a missing runtime brake.
Why it matters
A maintainer reading the state field in isolation sees only its REST use. That description omits a material property of the setting: REST and GraphQL task queries consume the same per-IP budget. Because the earlier request explicitly included this location, updating only configuration leaves that request partially completed.
Root cause and requested change
The observable cause is a partial documentation update across the two named locations: one received the shared-budget sentence and the other did not. Please finish that same correction by adding the following sentence to the existing state-field comment:
/// The same per-IP hourly budget applies to GraphQL `tasks` / `task`
/// queries and WebSocket task queries via `TaskReadBrake`.
Equivalent wording is fine. Keep the scope precise: this describes task queries over HTTP and WebSocket, not every GraphQL operation or event subscription. The sentence can be appended to the existing comment; no broader comment rewrite is required.
Verification and completion criterion
Read the updated state comment alongside config.rs:706-719, .env.example:285, and README.md:415. All four should describe the shared task-read budget consistently. The three already-correct locations do not need another edit. This documentation-only correction does not require new regression tests or runtime changes; normal repository checks are sufficient.
Once that sentence is present and accurate, this finding is addressed.
Why the review has kept returning
There is not a large set of outstanding findings on this head. There is one incomplete item from the agreed follow-up. The current changes implement the other requested corrections, and I have not established a new production regression in this follow-up.
This PR spans several representations of the same behavior: implementation, configuration help, state comments, README, and example environment settings. A correction can be technically accurate where applied but leave a specifically named companion location untouched. That is what happened with this documentation request. The practical way to close it is to check every location named in the request before marking the request complete, and submit the complete correction together.
Review discipline also matters. My previous feedback explicitly established a closed merge set and reserved further rounds for new-head regressions. Additional observations about already-reviewed behavior should not automatically become new merge requirements. Repeatedly expanding that set would make the author chase a moving target; responsibility for avoiding that expansion belongs to the review as well.
For this follow-up, use the original three-item request as the completion checklist: quarantine batching is implemented, the subscription mounting comment is corrected, and the shared-budget documentation needs only its state-field sentence. This is guidance for completing the existing request, not a request to audit or rewrite every documentation surface in the repository, add a documentation framework, or open another implementation pass.
Scope and stopping point
Please make the single state-comment correction in one small follow-up. Preserve the accepted runtime behavior, including limiter defaults and wiring, claim eligibility, cursor and scan-ceiling behavior, subscription relay logic, and client limits.
With the requested sentence added, the closed merge set is complete from this review. Any genuinely new regression introduced by a later change should be reported with its specific causal change and failure evidence; unrelated improvements should be handled separately rather than extending this PR's obligations.
Document that GraphQL task queries over HTTP and WebSocket debit the same per-IP hourly budget as REST task reads. Refs Gitlawb#395
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Checked head 80ba7a33 against origin/main. CI is green (12/12). The incremental change since the last reviewed head (ab054fb3) is two lines: a shared-budget sentence added to the AppState::task_read_rate_limiter field comment, completing the documentation correction requested in the prior round. All four companion locations now describe the shared per-IP task-read budget consistently: state.rs:333-334, config.rs:716-717, .env.example:285, and README.md:415.
Re-ran the prior load-bearing checks on this head. visible_tasks_tests passed 32/32. GraphQL WebSocket tests passed 4/4, including graphql_ws_authenticated_query_accesses_private_task, the per-IP rate-limit enforcement, the per-request field cap, and the per-operation budget reset. Two revert probes confirmed the read gates are load-bearing: removing the quarantine check from task_visible goes RED on quarantined_repo_task_withheld_from_owner_on_rest_and_graphql, and restoring ucan_token to task_to_read_json goes RED on ucan_token_never_appears_in_read_responses. The runtime shares the limiter across REST and GraphQL as the new comment states.
All six inline review threads are resolved.
Findings
- [P2] Fail closed for claim eligibility when a task's repo cannot be resolved to a locally hosted repo with established visibility.
crates/gitlawb-node/src/api/tasks.rs:468
task_claimablereturnstruefor non-mirror repo IDs that are missing fromrepos_by_id(line 468) and for slash-form mirror repo IDs (line 465), soclaim_tasklets any signed DID claim an unassigned task whose repo visibility was never established. The claim response usestask_to_json(line 673), which still includesucan_token(line 103), turning the claim path into a data egress for tasks that are invisible to reads. I seeded a task withrepo_id = "nonexistent-repo"(no repo row in the database) anducan_token = "SECRET-UCAN-TOKEN", then signedPOST /api/v1/tasks/t-unresolved/claimas an unrelated DID: the response was 200 OK with"ucan_token":"SECRET-UCAN-TOKEN". Meanwhiletask_visiblereturnsfalsefor the same unresolved repo (line 193), soGET /api/v1/tasks/t-unresolvedreturns 404. The read gate and the claim gate disagree on unresolved repos: the read gate fails closed, the claim gate fails open. Quarantine is checked inget_claimable_task(line 491), so quarantined repos are blocked; the gap is unresolved and mirror repos. The fix is to returnfalsefromtask_claimablewhen the repo ID is not inrepos_by_id(or to returnNonefromget_claimable_taskwhen the repo lookup fails), matching the fail-closed behavior oftask_visible.
Not an ask, recorded only: the cursor token is content-opaque but not length-opaque. The SIV construction encrypts JSON containing variable-length created_at and id fields with an XOR keystream, which preserves plaintext length, and the base64 wire form preserves that length variation. I minted two tokens with the same timestamp but different ID lengths: a 2-character ID produced a 116-character token, a 47-character ID produced a 165-character token. When the scan ceiling is hit, next_position is set to the last examined candidate, which may be a hidden row, so an anonymous list caller can distinguish hidden task ID lengths from the token length. The PR body says the cursor is opaque and the caller "learns nothing from it", which overstates the guarantee: the content is opaque but the length is not. Padding the plaintext to a fixed width before encryption would close the side channel.
One process note, not a finding: open #405 retargets the GET /api/v1/tasks limit clamp to [1, 200] while this branch clamps to [0, 200]. Resolve or close it after this lands so the two do not fight the collector.
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I found two implementation issues on head 80ba7a33: one database-work amplification issue to address before merge, and one low-risk MCP input-validation issue worth fixing in the same follow-up. The task-read security work has concrete value: REST and GraphQL share the visibility collectors, read responses omit UCAN tokens, quarantine takes precedence over party access, and authenticated WebSocket queries use the shared task-read brake.
Please treat the two findings below as the complete requested change set for this reviewed head. Address their root causes and regression coverage together. They do not require another redesign of task visibility, claims, pagination, or client limits.
Merge readiness
The reviewed head is mergeable against current main (bfc44f92), with no rebase drift and all current checks passing. GitHub reports merging blocked; there is no source conflict to resolve.
The renewed request to fail-close unresolved/mirror claims conflicts with the accepted #395 open-claim contract. That is not part of this change request. Successful claim delivery of payload/ucan_token is distinct from the gated, redacted read contract.
#275 overlaps task-assignment changes but contains additional work, and #405 proposes a competing [1, 200] clamp. Coordinate those branches when they land; neither requires changing this PR's accepted [0, 200] contract. Closed #327 is the predecessor, not a replacement for this PR.
Findings
[P2] Bound the repository work performed by the scoped task lookup
crates/gitlawb-node/src/db/mod.rs:1552-1556
Failure and impact
list_repos_deduped_by_ids returns only the requested repositories, but its query still visits unrelated repository rows. With the production schema and all production repository indexes, requesting one repository among 100,000 produces both custom and generic PostgreSQL plans that discard 99,999 rows. The task get path invokes this lookup, and the list collector can repeat it across five candidate batches. Anonymous REST reads and GraphQL task queries reach this work.
The 1,000-task scan ceiling bounds task candidates; it does not bound this separate repository-table scan. The per-IP brake limits request frequency, not the work within each request. As unrelated repositories accumulate, a task read becomes more expensive even when the number of task references remains fixed. This is a demonstrated scaling defect, not a claim that a production outage has occurred.
Root cause
The shared CTE combines unscoped and scoped access in one predicate:
AND ($2::text[] IS NULL OR EXISTS (
SELECT 1 FROM requested_groups requested
WHERE requested.owner_key = (...) AND requested.name = repos.name
))The requested IDs are used efficiently to construct requested_groups, but the outer repository access applies group membership as a filter over the broader scan. In the measured plans, the outer scan removes 99,999 rows; only the inner requested-ID lookup has the bounded primary-key index condition. The final WHERE d.id = ANY($2) restricts the result, after the expensive work.
This explains why a test asserting “only the requested repo was returned” passes while the operational problem remains. It also explains why batching the quarantine query, although correct and useful, does not resolve this different source of amplification. The accepted #327 request to scope repository loading needs to cover the access work as well as the returned rows.
At the merge base, task get reads agent_tasks directly without this repository query. The PR introduces the cost through its new visibility lookup. The existing unscoped repository-listing cost is outside this finding.
Requested outcome and implementation guidance
Make the scoped lookup's repository access follow the requested logical groups. A suitable approach is to give the scoped call a dedicated query shape, without the nullable “all repositories” alternative, and resolve matching group members through the existing owner-key/name index. Keep the unscoped callers on their existing all-repository path. Another formulation is acceptable if its measured access work and results satisfy the same requirements; this is not a requirement to add an index or reorganize all repository queries.
Preserve the order of operations that protects deduplication semantics: resolve the requested IDs to logical groups, consider the relevant canonical/mirror members, choose the existing survivor, then apply the final requested-ID restriction. Simply filtering the candidate rows to id = ANY(...) before choosing the survivor could change which row wins and is not an equivalent fix.
Verification for this fix
- Use a populated repository fixture with many unrelated groups and a small requested set. Run
ANALYZE, then inspectEXPLAIN (ANALYZE, BUFFERS)for the actual scoped query with both custom and generic prepared plans. The reproduced case uses 100,000 groups and one requested ID. - Verify that unrelated repository growth does not cause the scoped lookup to scan and discard the entire unrelated population. Assert the relevant access behavior rather than an exact elapsed-time threshold or one complete planner output; small-table sequential scans alone are not the bug.
- Keep the existing deduplication and visibility regressions green: canonical/mirror pairs, private canonical precedence, DID-method distinctions, deterministic ties, quarantine handling, requested-only output, and empty input. Check both existing unscoped CTE callers if shared SQL construction changes.
Authorization, quarantine-first precedence, group survivor rules, and task pagination semantics must remain unchanged.
[P3] Reject a present non-string MCP cursor before issuing a request
crates/gl/src/mcp.rs:1076
Failure and impact
The new cursor extraction is:
args.get("cursor").and_then(|v| v.as_str())A supplied number, object, array, or boolean becomes None. For example:
{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"task_list","arguments":{"limit":1,"cursor":123}}}The built MCP server sends /api/v1/tasks?limit=1, with no cursor. When the node returns a terminal first page, MCP reports successful first-page data with complete: true, rather than rejecting the invalid resume argument. The same behavior is reproduced with {}, [], and true as the cursor value.
This is limited to malformed MCP calls. Valid string cursors work, and there is no demonstrated authorization bypass. I would not block merge on this P3 alone.
Root cause
The advertised input schema says the cursor is a string, but tools/call passes the arguments directly to call_tool; it does not validate that schema. The conversion then collapses two different states—“cursor absent” and “cursor supplied with the wrong type”—into the same first-page request. Once that distinction is lost, fetch_tasks cannot recover it.
The adjacent limit parser already preserves the distinction between absent/null and invalid present values. Apply that narrow boundary rule to this new cursor parameter. This does not call for a general MCP schema-validation framework or cleanup of pre-existing argument coercions elsewhere.
Requested outcome and verification
Parse the optional cursor before calling fetch_tasks: absent or null remains None, a string is passed through unchanged, and every other present type returns an error. Do not stringify objects/numbers, trim or reinterpret valid strings, or change server-side cursor validation.
Add coverage at the MCP dispatch boundary, where the mistake occurs:
- Number, object, array, and boolean cursors return an error and issue zero task HTTP requests.
- Absent and null cursors retain first-page behavior.
- A string cursor is forwarded unchanged as a URL-encoded query value with the existing filters. Invalid string-token contents continue to be handled by the node.
Keep the current limit, pagination, identity-error, and continuation tests passing. A test of fetch_tasks alone cannot catch this issue because it receives an already typed Option<&str>.
Root-cause guidance and close-out scope
The common pattern in these two findings is that the existing checks cover the visible result without covering the boundary that determines its meaning or cost. The repository lookup returns the correct IDs while doing excessive underlying work. The MCP tool advertises the correct type while its runtime parser silently accepts a different one. Fix the boundary and add a regression that fails on the current implementation; adding more happy-path assertions around the final output will not close either gap.
This does not mean the entire feature is unstable or needs another hardening campaign. The visibility, quarantine, cursor, WebSocket, CLI/MCP, migration, and deduplication tests exercised for this review passed. These two missing assertions explain why those passing checks did not catch these particular issues. They do not establish that the same cause explains every previous review round.
Some review churn has also come from requests to revisit settled behavior. Keep those choices out of this follow-up:
- Preserve open unassigned claims for repo-less, unresolved, and slash-form mirror references, with quarantine denial and the existing locally hosted private-repository gate.
- Preserve the atomic preassigned-assignee guard and successful claim token delivery; keep UCAN tokens omitted from reads.
- Preserve
[0, 200], cursor contents/bindings/expiry, the scan-ceiling continuation behavior, and all existing CLI/MCP page and byte caps. - Preserve the task-read limiter's default, disable semantics, and REST/GraphQL/WebSocket sharing. Keep publish-side subscription filtering and the existing identity-error behavior.
- Leave unrelated pin/anchor limitations and competing PR scope outside this patch.
Please deliver both fixes and their focused regression evidence together. For the SQL change, include the populated custom/generic plan evidence and preserved dedup behavior. For the MCP change, include wrong-type rejection before network access and unchanged valid/absent cursor behavior. Run the existing affected suites after both changes are in place so the shared consumers are checked together.
Any additional request on a later head should identify a concrete regression or newly verified defect, its causal change, and its smallest required correction. It should not reopen a settled product choice under a new description. The requested work here is these two bounded fixes, not an open-ended mandate to redesign adjacent behavior.
Bound repository access in list_repos_deduped_by_ids to requested groups via idx_repos_owner_key_name, leaving dedup_cte unscoped. Strictly validate MCP task_list cursor argument before network dispatch. Refs Gitlawb#396
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Verified a0ea4c78 end to end. The scoped lookup is bounded the way it should be: EXPLAIN (ANALYZE, BUFFERS) on the query list_repos_deduped_by_ids issues over a 4000-repo fixture resolves requested groups by primary key and joins candidates through idx_repos_owner_key_name with no mass discard, and the same holds under a real generic plan (PREPARE with force_generic_plan). Dedup semantics are unchanged: mirror-id and quarantined-id lookups still return nothing, requesting canonical+mirror returns the canonical once, and all three callers (list, get, claim) route through the scoped path. The MCP side rejects a non-string cursor before any request is issued; reverting it in a scratch checkout makes the new test fail with the request actually reaching the mock server, which also proves the rejection is pre-dispatch. The quarantine and ucan_token revert checks from prior rounds still go red on this head, and the task-read suites are green.
On my last finding: claim eligibility for unresolved and mirror repo ids is the accepted #395 contract per jatmn's review, so I am not re-litigating it.
Findings
-
[P2] Make the plan test able to fail on the defect it certifies
crates/gitlawb-node/src/db/mod.rs:6743
assert_scoped_repo_planaccepts any index node onreposand rejects only aSeq Scan, but the removed defect plans as anIndex Scanonidx_repos_owner_key_namethat discards 3999 of 4000 rows through a filter (a hashed subplan over the group-membershipEXISTS). I restored that exact shape and the test stayed green. Assert the index name on the join node, or boundRows Removed by FilterunderEXPLAIN (ANALYZE). The generic half is also inert:SET plan_cache_modenever reaches a literalEXPLAIN, which always plans a custom plan, so both halves produce byte-identical output. UseEXPLAIN (GENERIC_PLAN)(CI's postgres:16 supports it) orPREPAREplusEXPLAIN EXECUTEinstead; I ran the real generic plan and index access holds, so only the test needs to change. -
[P3] Drop the stray escapes in the dedup doc comment
crates/gitlawb-node/src/db/mod.rs:1602
The line now readsper-caller \"/\"with literal backslashes; the parent hadper-caller"/"``.
Not an ask, recorded only: .expect(2) on the mock in test_task_list_null_or_absent_cursor_accepted is not enforced by mockito without a matching .assert(); the test still proves dispatch through the unwrap on the mock's 200, so it is cosmetic.
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Summary
Gates agent-task read surfaces behind repo/task visibility rules, decouples open-claim eligibility from read visibility, resets WebSocket field budgets per operation, and aligns task claim tests with the opaque 404 existence-hiding contract.
Refs #395
Changes
TaskReadBrakeExtensionincrates/gitlawb-node/src/graphql/mod.rsto reset the 5-field task read budget per WebSocket operation while preserving connection-level per-IP rate limits./graphql/wsunderoptional_signatureand threadAuthenticatedDidinto GraphQL connection data.is_repo_quarantinedto prevent leaks on quarantined mirror repos.task_listlimitparameter inglMCP strictly as integer or default 50.complete/error) by operation ID in test helpers.claim_task_does_not_steal_preassigned_assigneewith opaque 404 expectations and preserve direct SQL guard coverage.Prior reviewer feedback addressed
is_repo_quarantinedon task claim fallback, authenticate WebSocket queries, strictly validate MCP limit argument, and add forged-signature WebSocket rejection test.task_write_conflictassertion message inclaim_task_does_not_steal_preassigned_assignee.Test plan
cargo fmt --all -- --checkcargo check --workspace --all-targetscargo clippy --workspace --bins -- -D warningscargo test -p gitlawb-node graphql_ws_authenticated_query_accesses_private_taskcargo test -p gl --bin gl mcp::testsSummary by CodeRabbit
New Features
--cursorand incomplete-result notices.Bug Fixes
Security