Three findings, all real. The first is a security hole introduced by
round 1's own fix.
1. The analysis job could have published live secrets. Round 1 pinned
`Bash(gh issue comment <N>:*)` to the tracked issue and treated that
as scoping, but a `Bash(...)` grant matches a command PREFIX and says
nothing about the flags that follow — so
`gh issue comment <N> --body-file /proc/self/environ` matched it, and
this job's subprocess environment holds ANTHROPIC_API_KEY and
GITHUB_TOKEN. A prompt injection from upstream release notes could
have posted live credentials into a public issue.
The model now has no tool that can write anywhere. It returns its
write-up as `--json-schema` structured output, and a deterministic,
model-free step posts it: the body arrives through the environment
rather than the command line, so nothing in it can be read as a flag
or a path, and the issue number comes from the matrix. That step is
the only thing in the job holding a token that can write.
WebFetch is denied as well. It was not raised, but with `Read`
available an outbound fetch the model controls is the same
exfiltration channel by another route; `gh release view` already
covered the need. The remaining grant is read-only and accepts no
attacker-chosen file path.
The general rule is now in AGENTS.md rather than only this instance:
a prefix grant on any command that accepts a file path is an
arbitrary-file read with a publish attached.
2. Issue existence was standing in for analysis completion. A failed or
timed-out `analyze` job left an issue the next sweep matched, emitted
`[]` for, and reported as a green no-op — so the promised analysis was
never retried. The posting step now stamps ANALYSIS_MARKER on its
comment, and a sweep finding an existing issue without one re-queues
it. The marker is matched with `startsWith`, so a maintainer quoting
it cannot suppress the retry.
3. A failed supersession note was unrecoverable. Creation succeeding and
the note failing left a state where every retry matched the target's
own marker and skipped reconciliation entirely, so the note was never
posted. An existing issue is now ADOPTED rather than skipped: the loop
takes its number and runs the same follow-up it would for a new one.
The existing announced-marker check prevents duplication, and a
`stale.number === number` guard stops an issue superseding itself.
Findings 2 and 3 share one restructure — replacing the early `continue`
with adoption is what gives both the retry path.
ANALYSIS_MARKER is necessarily duplicated in the workflow, since the
posting step is shell. Drift would be invisible from either file alone
and would make every issue read as permanently unanalyzed, so a test
asserts the workflow contains the exact constant.
Mutation-checked, each failing a different minimal set:
if (match) continue; restored -> supersession-retry + re-queue tests
hasAnalysis -> always true -> re-queue + hasAnalysis tests
workflow marker misspelled -> the drift-guard test
47 tests in this file; `npm run local:gate` green end to end.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019JWUZxLDnPgLQzjBrtk1x9
Signed-off-by: cliffhall <cliff@futurescale.com>
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