fix(webhook): queue a standing-watch batch at the hook cap, don't drop it - #584
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fix(webhook): queue a standing-watch batch at the hook cap, don't drop it#584defangdevs wants to merge 2 commits into
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…p it `modules/src/webhook-spawn.sh` refused a batch at the hook-session ceiling with a message and `exit 1`. The dispatcher cannot tell that apart from "command not found", so it dropped the batch for good — and a standing watch is for events NO session owns, so unlike a failed session delivery there was no peer holding a copy. #170 made the loss visible; the events were still gone. local-webhook reads 75 (EX_TEMPFAIL) as "declined for now": the batch goes back at the head of its key's pending list, is re-offered as the rate window reopens, and starts the moment a slot frees, with every line re-checked against live session ownership first. So the cap — and only the cap — exits 75. A malformed AGENT_BOX_HOOK_SESSION_ARGS or a failed `add` keeps its own status, because re-offering a broken spawner would loop. The receiver unit also raises LOCAL_WEBHOOK_SPAWN_DEFER_MAX_S to an hour. Upstream's 300s default is for a consumer that declines briefly; ours is a session ceiling and a hook session runs for tens of minutes, so five would drop the batch anyway — the same loss, later. Overridable per box in agent-box-webhook-<user>.local.env. The refusal record now says `deferred`, so `status` does not report as lost a batch the receiver is still holding, and the sentence `ls`/`status` print says the batch is queued rather than dropped. New native check `webhook-defer` runs the REAL wrapper as the REAL pinned Dispatcher's spawn command: it fills the cap, asserts exit 75 and the recorded deferral, frees a slot, and asserts the declined batch starts by itself with no second delivery. That contract was the whole bug — the two programs disagreeing about what a non-zero exit meant — and it costs seconds natively. The typo-fallback leg moved there too: tests/webhook.nix sits 384 bytes under the 128 KiB testScript ceiling. Closes #301. Co-Authored-By: Claude Opus 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01NWmLRsa4keJzBo9Minofxe
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Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🔵 Low · up to Webhook batches refused at the session cap now defer for retry rather than being dropped. The remaining risk is limited to an unresolved repository-format requirement in AGENTS.md, with no identified delivery or runtime defect. Sequence Diagram(s)sequenceDiagram
participant Webhook dispatcher
participant Spawn wrapper
participant Hook-session registry
Webhook dispatcher->>Spawn wrapper: Submit webhook batch
Spawn wrapper->>Hook-session registry: Check hook-* capacity
Hook-session registry-->>Spawn wrapper: Capacity full
Spawn wrapper-->>Webhook dispatcher: Return EX_TEMPFAIL
Webhook dispatcher->>Spawn wrapper: Retry retained batch
Hook-session registry-->>Spawn wrapper: Slot available
Spawn wrapper-->>Webhook dispatcher: Start hook session
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Inline comments:
In `@AGENTS.md`:
- Line 67: Replace the U+2014 em dash in the documentation text with the ASCII
sequence “--”, preserving all surrounding wording and formatting.
In `@modules/src/webhook-cli.sh`:
- Around line 172-174: Update the documentation around lastRefusal.deferred in
the webhook CLI to describe it as cumulative historical state: true records that
the wrapper previously returned 75, including after the batch was delivered or
expired. Remove wording that implies the batch is currently waiting, without
changing the producer’s behavior.
In `@tests/golden/web/etc/agent-box-guides/AGENTS.agent.md`:
- Line 325: Update the documentation around record_refusal and
lastRefusal.deferred so deferred is described as indicating that a batch was
deferred for retry, not its current queue or pending state. Preserve the
distinction that the cumulative refusal record remains true after dispatch or
deadline expiry.
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AGENTS.mdREADME.mdbin/agentboxflake.nixmodules/agent-box.nixmodules/agent-box.nix.inmodules/src/default-agents-webhook.mdmodules/src/webhook-cli.shmodules/src/webhook-spawn.shtests/golden/web/etc/agent-box-guides/AGENTS.agent.mdtests/golden/web/etc/agent-box/units/agent-box-webhook-agent.envtests/golden/web/etc/agent-box/units/agent-box-webhook-robot.envtests/golden/web/payloads/agent-box-webhook-spawn/bin/agent-box-webhook-spawntests/golden/web/payloads/agent-box-webhook/bin/agent-box-webhooktests/native/expected/etc/agent-box-guides/AGENTS.agent.mdtests/native/expected/etc/agent-box-guides/AGENTS.robot.mdtests/native/expected/etc/agent-box/units/agent-box-webhook-agent.envtests/native/expected/etc/agent-box/units/agent-box-webhook-robot.envtests/test-webhook-defer.shtests/webhook.nix
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CodeRabbit on #584: `record_refusal` writes `deferred: true` when the wrapper answers 75, and nothing ever rewrites it. It stays true after the batch starts, and after the receiver gives up on it at LOCAL_WEBHOOK_SPAWN_DEFER_MAX_S. So "says whether the last batch is waiting or was lost" was wrong in `status`, in `--help`, in the shipped guide and in the record's own `//` note. It records the ANSWER that batch got - declined for retry rather than a failure that drops it - and the wrapper is gone before either ending, so nothing there could keep live queue state honest. Said that way in all four places, with the "not a queue" reason attached where a reader would otherwise assume one. Also ASCII on the new AGENTS.md line, per the repo's Markdown rule. Co-Authored-By: Claude Opus 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01NWmLRsa4keJzBo9Minofxe
defangdevs
dismissed
coderabbitai[bot]’s stale review
September 5, 2026 00:21
All three addressed in c6e6151: the ASCII em dash on the new AGENTS.md line, and the two deferred findings, which were right — the field records the answer the wrapper gave, never live queue state, and it is now described that way in status, --help, the shipped guide and the record itself.
lionello
approved these changes
Sep 5, 2026
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The symptom
Four
hook-*sessions whose agents forgotagent-box-session rmmake everystanding watch on the box inert, and a wedged box reads exactly like a quiet
repo. #170 fixed the visibility half —
agent-box-webhook statusreports therefusal — but the events were still thrown away: this box's own record shows
20 batches dropped since 2026-08-26.
modules/src/webhook-spawn.shrefused at the ceiling with a message andexit 1. The dispatcher cannot tell that apart from "command not found", soit dropped the batch deliberately. For a
--deliver-to subagentwatch theloss is total — the whole point is events no session owns, so there is no peer
holding a copy.
What changed
exit 75at the cap, and only there. local-webhook reads 75(
EX_TEMPFAIL) as "declined for now": the batch goes back at the head of itskey's pending list, is re-offered as the rate window reopens, and starts the
moment a slot frees — with every line re-checked against live session
ownership first. A malformed
AGENT_BOX_HOOK_SESSION_ARGSor a failedaddkeeps its own status, because re-offering a broken spawner would loop.
LOCAL_WEBHOOK_SPAWN_DEFER_MAX_S=3600on the receiver unit (bothbackends). Upstream's 300s default is sized for a consumer that declines
briefly; ours is a session ceiling and a hook session runs for tens of
minutes, so five minutes would drop the batch anyway — the same loss, later.
An hour is the other bound: past it the event has usually been overtaken.
Overridable per box in
agent-box-webhook-<user>.local.env.The record says which answer was given.
webhook-spawn-refused.jsonnowcarries
deferred: true, sostatusdoes not report as lost a batch thereceiver is still holding, and the sentence
ls/statusprint says the batchis queued rather than "refused and DROPPED, never queued".
Both blockers the issue named are clear: local-channels PR #39 landed in
0.16.0 and the
webhook.revpin is at 0.27.0. On a box pinned older, 75 readsas a broken spawner and the batch is dropped exactly as before — never worse
than what it replaces.
Test
New native check
webhook-defer(tests/test-webhook-defer.sh), whichruns the REAL wrapper as the REAL pinned
Dispatcher's spawn command:Negative control: against
origin/master's wrapper, 4 of the 8 fail —including the last, which fills the cap, frees a slot and asserts the declined
batch starts by itself with no second delivery. That contract was the whole
bug, and it costs seconds natively instead of a VM boot.
tests/webhook.nixkeeps its cap legs (now asserting 75 exactly, not merelynon-zero) and hands the typo-fallback leg to the new check. Its
testScriptlands 384 bytes under the 128 KiB
testscript-fitsceiling — it was 408under before.
All 32
aarch64-linuxchecks pass, plusty/ruffon the extracted VMtestScript and
nix eval .#checks.x86_64-linux.webhook.drvPath.Closes #301.
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