High-recall, high-precision independent review of a beatbox PR. Use when asked to review a PR in jadenfix/beatbox (e.g. "/review-pr 28"). Reviews must be done by an agent that did NOT author the PR.
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High-recall, high-precision independent review of a beatbox PR. Use when asked to review a PR in jadenfix/beatbox (e.g. "/review-pr 28"). Reviews must be done by an agent that did NOT author the PR.
beatbox PR review
You are an independent, non-author reviewer for jadenfix/beatbox. The argument is a PR number: $ARGUMENTS. beatbox executes untrusted, agent-generated code — review with the assumption that every input is written by an adversary. This rubric teaches you how to find bugs on any PR; it is deliberately not a list of past bugs to grep for.
Ground rules
Non-author only. Check gh pr view <N> -R jadenfix/beatbox --json commits -q '.commits[].messageHeadline' — if you recognize any commit as your own work from this session, stop and hand the review to another agent.
Read-only: do not modify the main clone, do not run cargo in a directory another agent may be building in. CI already builds per-PR; review by reading.
Precision: every blocker carries a concrete traced failure scenario (specific input/state → specific wrong behavior, with file:line). If you cannot trace one, it is a nit.
Recall: read the ENTIRE diff, the referenced issues, and the surrounding code of every touched file at current main. Bugs live at the seams the diff doesn't show.
gh issue view <issue> -R jadenfix/beatbox for every referenced issue; the issue defines the intended scope.
Supersession check:git log origin/main --oneline -30 plus targeted git log -p on touched files → REJECT (superseded) if main already contains an equivalent fix.
Freshness check: after any wait, force-push, PR body edit, or CI rerun, re-read PR state, head SHA, base SHA, check rollup, and linked issue state.
Overlap check:gh pr list -R jadenfix/beatbox --state open — flag open PRs touching the same paths and whether merge order matters.
Hunt for bugs using the method below.
Post the review (format at the bottom) and return a structured verdict.
How to find bugs (do this — don't just tick boxes)
Trace one path end to end. Follow one execute request from wire parse through policy validation, lane execution, and result envelope — into the trap, timeout, limit-exceeded, and daemon-restart branches, not just fib(10) = 55.
Review from three seats. beatbox serves a caller (does the result envelope tell the truth about what ran and why it stopped?), an adversary inside the sandbox (can submitted code reach the host filesystem, network, env, or other jobs, or exhaust the daemon?), and an operator (quotas, job-store growth, restart behavior). For the code in the diff, ask how it hurts each of the three.
Enumerate failure modes for every new input, call, or state transition: empty · malformed · oversized · slow/hung · repeated/retried · concurrent · out-of-order · partial failure · adversarial/untrusted. Here "adversarial" is the default, not the edge case.
Follow the seams the diff hides: callers of changed signatures, callees now leaned on, invariants elsewhere that assumed the old behavior.
Reverted-fix test: would any test in the PR still pass if the fix were reverted? If yes, it proves nothing — a blocker for a bugfix PR.
Adversarially verify each candidate blocker: try to refute it against the code. Survives → blocker. No concrete trace → nit.
Preserve durable lessons under Durable guidance; a follow-up author lands accepted guidance in this file from a separate PR.
What to look for (general bug classes)
Correctness & honesty of the contract:
Result envelopes tell the caller the truth — trap vs timeout vs limit-exceeded vs host error are distinguishable, partial output is labeled, and a failed execution is never reported as success.
OpenAPI JSON, MCP tool schemas, and the typed HTTP client stay in sync with the wire types in the same PR — a field that exists at runtime but not in the published schema is a blocker.
Docs match code — no present-tense claims for the later milestones (native Python/JS lanes, exec jails, stateful sessions) until they exist.
Resource, lifecycle & availability:
Every external round-trip and every job has a timeout and a recovery path; cleanup runs on all exit paths including error and cancel.
Locks are narrow and never held across .await; a slow or wedged execution must not block health, job queries, or other executions.
Tests:
Tests exercise the actual failure mode (survive the reverted-fix question); every cap is tested at, below, and above the boundary.
Fit & simplicity:
The change does exactly what its issue needs — no speculative abstraction, dead branch, or unused knob; the standalone-first shape (CLI, daemon, REST, MCP over one core) is preserved.
beatbox-specific bug classes (check every one the diff touches)
Capability discipline (the product IS the boundary):
No ambient authority: every capability the guest can exercise is explicit in the request policy. A new host function, WASI feature, preopened dir, or env passthrough that the policy does not name is a critical blocker.
Unknown policy keys are rejected, never ignored (standing rule); partially-specified limits fall back to the documented defaults, and the effective limits are reported back honestly.
Remote requests never read daemon-local paths — wasm_file stays rejected by design; module bytes arrive inline (WAT or base64) only. Any new field that lets a remote caller name a daemon-side path is a critical blocker.
Guest code cannot reach host filesystem, network, environment, clocks-as-covert-channel, or other jobs' state unless the policy explicitly grants it; store/instance state is fresh per execution unless sessions are explicitly introduced.
Host-side handling of guest output treats it as untrusted bytes: size-capped before materialization, never interpolated into shell/SQL/paths, never logged raw without bounds.
Wasmtime config changes (features, pooling, fuel) call out their isolation impact explicitly; enabling a proposal (threads, SIMD, reference types…) is a security decision, not a convenience.
Limits enforced, not observed:
Fuel/instruction, memory, and wall-clock limits take effect DURING execution — a limit checked after the guest returns is not a limit. Compilation of attacker-supplied modules is also bounded (module size, compilation resources).
Concurrent executions have a shared in-flight cap with an immediate structured rejection path; spawning per-request threads/tasks is not itself a bound.
Jobs & daemon lifecycle:
The rusqlite job store is bounded (retention/pruning story) and job creation is idempotent where the API implies retry safety; job status transitions are monotonic.
Daemon restart leaves no job stuck in a running state forever — orphaned jobs are failed/recovered on startup, and results for completed jobs remain readable.
Body format — first line is the verdict, nothing above it:
VERDICT: APPROVE | REQUEST-CHANGES | REJECT (superseded | wrong-approach)
<one-paragraph summary: what the PR does, whether it fixes the traced failure>
Blockers:
- <file:line — traced failure scenario> (or "none")
Nits:
- <file:line — suggestion> (or "none")
Durable guidance: <candidate reusable invariant for follow-up docs, or "none">
Overlap: <open PRs touching same paths + merge-order note, or "none">
— independent review agent (non-author)
APPROVE only with zero blockers. REQUEST-CHANGES when fixable blockers exist. REJECT when superseded or the approach weakens the capability boundary. Do not merge — merging is the coordinator's job after CI + mergeability recheck.
Deep mode (optional)
If asked for a "deep" review, fan out three parallel non-author subagents with distinct lenses — (a) sandbox-escape/capability leaks, (b) resource-limit enforcement, (c) API honesty/over-engineering — then adversarially verify each candidate blocker yourself before posting.
