fix(webhook): never claim CI on a shared ref, so a red trunk gets its own session - #385
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…ession A hook session seeded for a CI outcome claimed EVERY CI outcome in its repo, so a failing run on master, main or a release tag was silenced for as long as that session lived. Measured on the origin box, 2026-08-26 17:56 UTC: the master Deploy test went red and the receiver logged "not spawning for workflow_run ... session agent-hook-defangdevs-agent-box-4086 claimed it" — a session started minutes earlier for a PR-branch failure. Nothing triaged the red master. Same shape as the #251 incident the claim was narrowed for, one notch narrower. The claim is now qualified by the head ref: a ref with no "/" in it — `master`, `main`, `v3.14.1`, `release-2` — is shared, nobody's object, and never claimed, so the standing watch always spawns for it. `contains: ["/"]` is the only "looks like" the predicate language has (LEAF_OPS is in/notIn/contains/notContains — no glob to ask for `v*` with), and it errs in the safe direction: an unslashed topic branch loses twin dedupe, one extra session, where a mis-swallowed red trunk costs an hour of nobody looking. Accepted with it: a session spawned FOR a red trunk claims nothing, so that run's second event can start a twin beside it. The spawn preamble and the shipped guide now ask such a session to claim the ref by name — it can read the ref off its own event text, which the wrapper cannot (the exact-run claim still wants branch/run id in LOCAL_WEBHOOK_SPAWN_META, defangdevs/local-channels#46). Tests: the seeded claim shape, plus the pinned webhook.py matching that claim against master/main/v3.14.1/topic-branch payloads in both the workflow_run and check_run shapes (a jq assertion cannot tell a claim that reads right from one that matches nothing), plus end to end — with the claiming peer live, a failing run on master spawns its own hook session. Fixes #384 Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PBDHCBttvBEHQJJH24MfxF
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Included review availability: Your plan provides up to 10 included reviews per hour; 6 remain after this review. 📝 WalkthroughWalkthroughChangesThe webhook CI ownership predicate now claims only recognized CI events with head refs containing Shared-ref CI dispatch
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: ⚪ Minimal · up to The change narrows CI-session claiming to topic branches while allowing shared-ref failures to start their own triage session; the supplied checks and validation support merge readiness, with no actionable merge-blocking risk remaining. Sequence Diagram(s)sequenceDiagram
participant CI as CI event
participant Receiver as Webhook receiver
participant Predicate as CI ownership predicate
participant Dispatcher as Session dispatcher
CI->>Receiver: deliver workflow failure
Receiver->>Predicate: evaluate event and head ref
Predicate-->>Receiver: claim only slash-containing topic refs
Receiver->>Dispatcher: dispatch shared-ref failure
Dispatcher->>Dispatcher: create dedicated hook session
Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Linked Issues checkExplanation The changes satisfy issue Full details: Out of Scope Changes checkExplanation The code, documentation, generated fixtures, and tests all support the linked issue and stated objectives. No unrelated infrastructure, authentication, watch-policy, CLI, or migration changes are present. Full details: Docstring CoverageExplanation Docstring coverage is 66.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 1 files. (1 skipped: 1 unsupported.)
✨ Finishing Touches🧪 Generate unit tests (beta)
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The native renderer keeps its own committed fixture of the shipped guide, so editing modules/src/default-agents-webhook.md moves two fixtures, not one (`nix run .#update-golden` covers the NixOS side; this is `python3 tests/test_agentbox.py --update`). Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PBDHCBttvBEHQJJH24MfxF
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In `@modules/src/default-agents-webhook.md`:
- Around line 64-68: Update the CI dispatcher guidance around shared-ref
failures to state that bypassing ownership claims does not guarantee a new
session: when four hook sessions are already active, the dispatcher refuses and
drops the batch. Preserve the instruction to explicitly include the shared ref
when selecting such a run.
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modules/agent-box.nixmodules/src/default-agents-webhook.mdmodules/src/webhook-spawn.shtests/golden/web/etc/agent-box-guides/AGENTS.agent.mdtests/golden/web/payloads/agent-box-webhook-spawn/bin/agent-box-webhook-spawntests/webhook.nix
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Review on #385: "always gets a session of its own" overstated it. Ownership is what a shared ref escapes — the four-session ceiling two sentences down is still the one thing that can refuse the batch, and a guide that promises a session where the box drops one is worse than no promise. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PBDHCBttvBEHQJJH24MfxF
… shape The CI claim is `all: [presence, head-ref]` now, so the fallback case's `include.any` path no longer exists and jq failed on null — caught by CI after the first assertion was updated and this one was not. It now checks both halves, which is what makes it a fallback to the CI claim rather than to "some object". Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PBDHCBttvBEHQJJH24MfxF
lionello
approved these changes
Aug 26, 2026
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Fixes #384.
Motivation
A hook session's seeded
includeis what silences the standing watch. Since #251 a session spawned for a CI outcome claims CI outcomes on its repo — and that is still wider than any object a session can own: it swallows a failing run onmaster, onmain, and on a release tag.Observed on the origin box, 2026-08-26 17:56 UTC.
master's Deploy test finishedfailureat 17:55:38Z; one minute later:…-4086had been spawned minutes earlier for a PR-branch failure. No session triaged the red master. The watch's own rules matched the event fine (watchPolicyhas the terminal-CI clause); the ownership brake is what dropped it — the same shape as the incident quoted inwebhook-spawn.sh("Nobody looked at a red master for an hour"), one notch narrower.A topic branch belongs to whoever pushed it, and swallowing its second CI event is exactly the twin dedupe the claim exists for.
masterand a tag belong to nobody: a red trunk or a broken release has to reach a fresh triage session whatever else is running.Change
claim_include's CI arm is now qualified by the head ref:{"all": [ {"any": [{"path": "workflow_run", "notIn": [null]}, … ]}, {"any": [{"path": "workflow_run.head_branch", "contains": ["/"]}, {"path": "workflow_job.head_branch", "contains": ["/"]}, {"path": "check_suite.head_branch", "contains": ["/"]}, {"path": "check_run.check_suite.head_branch", "contains": ["/"]}]} ]}A ref with no
/in it —master,main,v3.14.1,release-2— is treated as shared and never claimed.containsis the only "looks like" the predicate language has (LEAF_OPSisin/notIn/contains/notContains; there is no glob or prefix leaf to ask forv*with), and it errs in the safe direction: an unslashed topic branch loses twin dedupe — one extra session — where a mis-swallowed red trunk costs an hour of nobody looking.Accepted with it, and said out loud in the comment: a session spawned FOR a red trunk claims nothing, so that run's second event can start a twin beside it. The spawn preamble and the shipped guide now ask such a session to claim the ref by name — it can read the ref off its own event text, which the wrapper cannot. The exact-run claim still needs branch/run id in
LOCAL_WEBHOOK_SPAWN_META: defangdevs/local-channels#46.User-visible and security effects
master/main/a tag always spawns ahook-*triage session, however many sessions are live. Costs hook-session capacity (the 4-session ceiling) in exchange for never losing a red trunk./etc/agent-box-guides/AGENTS.<user>.md) gains the same rule, and the spawn preamble tells a shared-ref session to claim the ref itself.watchPolicy, to the CLI's default--when, or to the auth/ingress path.Checks run
Native,
aarch64-linux(all pass):nix run .#assemble(regeneratedmodules/agent-box.nix; committed)nix run .#update-golden(fixture diff is the two files this change touches: the shipped guide and the spawn payload)nix build -L .#checks.aarch64-linux.{module-generated-up-to-date,golden-snapshot,multi-user,module-single-file,webhook-route,download-route,assemble-module-escaping}Off-box: the
webhookVM test isx86_64-linux-only, so CI runs it. Its Python was syntax-checked here by evaluatingtestScriptandast.parse-ing it, and the new claim predicate was verified against the pinnedwebhook.pymatcher directly (match_predicate): claimed forfeat/…andfix/…in both theworkflow_runandcheck_runshapes, not claimed formaster,main,v3.14.1.Test additions
webhook.pyasked whether that claim covers each payload — a jq assertion on the JSON cannot tell a claim that reads right from one that matches nothing (the first version of this claim named.idand silently never matched);workflow_runonmasterspawns its ownhook-*session.No AWS cost, IAM, networking or migration impact. Deployed boxes pick this up on the next
agent-box-update.🤖 Generated with Claude Code
https://claude.ai/code/session_01PBDHCBttvBEHQJJH24MfxF