{
  "sha": "9b51f95ef609a219e211e37b082cd2e6913190e0",
  "model": "anthropic/claude-sonnet-5",
  "effort": "high",
  "found_per_pass": {
    "agent": 3
  },
  "findings": [
    {
      "path": "services/proxy/src/routes/admin.rs",
      "start_line": 76,
      "end_line": 76,
      "label": "bug",
      "severity": "critical",
      "explanation": "reclaim` calls `app.sweeper.sweep(dry_run)` directly instead of the async `Sweeper::run` (sweep.rs:82-85), so it never takes the `running` mutex that sweep.rs's own module doc (sweep.rs:11-13) says…\n\nreclaim` calls `app.sweeper.sweep(dry_run)` directly instead of the async `Sweeper::run` (sweep.rs:82-85), so it never takes the `running` mutex that sweep.rs's own module doc (sweep.rs:11-13) says is required: \"Two of them over one directory would each decide what to remove from a total the other is already changing... they would take the store far below the ceiling either was aiming at.\" A `POST /v1/admin/cache/sweep` that lands while the periodic sweep (main.rs:116, which does use `run()`) is in flight, or two concurrent admin requests, run two unsynchronized sweeps over the same directory concurrently, defeating the exact invariant the code is built around.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 102,
      "end_line": 102,
      "label": "bug",
      "severity": "high",
      "explanation": "candidates.sort_by_key(|candidate| candidate.age)` sorts ascending, i.e. newest (smallest age) first, but the comment directly above (lines 100-101) and the documentation added in…\n\ncandidates.sort_by_key(|candidate| candidate.age)` sorts ascending, i.e. newest (smallest age) first, but the comment directly above (lines 100-101) and the documentation added in docs/architecture.md:55 and docs/operations.md both state the sweep \"removes the oldest blobs\" to reclaim space. Since the loop never breaks and removes for the capacity reason in list order, once several blobs are past `min_age` the sweep evicts the ones that *just* crossed the grace period first and leaves genuinely ancient blobs cached longest - the opposite of the advertised LRU-style eviction, causing needless refetch churn on blobs that are merely old-enough while truly stale blobs sit untouched.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/metrics.rs",
      "start_line": 94,
      "end_line": 94,
      "label": "bug",
      "severity": "high",
      "explanation": "values()` returns `sweep_bytes_reclaimed` at index 4 and `sweep_blobs_removed` at index 5, but `COUNTERS` (metrics.rs:50-57) lists `cairn_proxy_sweep_blobs_removed_total` at index 4 and…\n\nvalues()` returns `sweep_bytes_reclaimed` at index 4 and `sweep_blobs_removed` at index 5, but `COUNTERS` (metrics.rs:50-57) lists `cairn_proxy_sweep_blobs_removed_total` at index 4 and `cairn_proxy_sweep_bytes_reclaimed_total` at index 5. `render()` zips the two arrays positionally, so the exposed Prometheus metrics are swapped: the \"blobs removed\" metric reports byte counts and the \"bytes reclaimed\" metric reports blob counts, silently breaking the exact `cairn_proxy_sweep_bytes_reclaimed_total` alerting the PR's own docs/operations.md change tells operators to watch.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    }
  ]
}