{
  "sha": "9b51f95ef609a219e211e37b082cd2e6913190e0",
  "model": "anthropic/claude-opus-5",
  "effort": "high",
  "found_per_pass": {
    "agent": 9
  },
  "findings": [
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 140,
      "end_line": 140,
      "label": "bug",
      "severity": "critical",
      "explanation": "forget` runs unconditionally, so `POST /v1/admin/cache/sweep?dry_run=true` deletes every index entry naming a blob it merely *reported* — `gone` is populated at line 137 regardless of `dry_run`.\n\nThe advertised \"reports what one would reclaim without removing anything\" (docs/operations.md) silently un-caches the store, and the next real sweep then deletes those now-unreferenced blobs.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/metrics.rs",
      "start_line": 94,
      "end_line": 94,
      "label": "bug",
      "severity": "critical",
      "explanation": "values()` returns bytes-reclaimed where `COUNTERS[4]` is `cairn_proxy_sweep_blobs_removed_total` and blobs-removed where `COUNTERS[5]` is `cairn_proxy_sweep_bytes_reclaimed_total`; the two sweep…\n\nvalues()` returns bytes-reclaimed where `COUNTERS[4]` is `cairn_proxy_sweep_blobs_removed_total` and blobs-removed where `COUNTERS[5]` is `cairn_proxy_sweep_bytes_reclaimed_total`; the two sweep counters are exposed under each other's names, so the alert docs/operations.md tells operators to build on `cairn_proxy_sweep_bytes_reclaimed_total` reads a blob count. Swap lines 94 and 95.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 102,
      "end_line": 102,
      "label": "bug",
      "severity": "critical",
      "explanation": "sort_by_key(|c| c.age)` orders *ascending* age — newest first — so the over-ceiling loop evicts the blobs most recently fetched, exactly the opposite of the comment on line 100 and of the…\n\nsort_by_key(|c| c.age)` orders *ascending* age — newest first — so the over-ceiling loop evicts the blobs most recently fetched, exactly the opposite of the comment on line 100 and of the `CACHE_MIN_AGE` grace period's purpose (a fresh blob just past `min_age` goes before a year-old one). Sort by `std::cmp::Reverse(candidate.age)`.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 232,
      "end_line": 232,
      "label": "bug",
      "severity": "high",
      "explanation": "clear_partials` unlinks every file in `incoming` with no age or liveness test, but that directory holds the *in-flight* temp files of `BlobStore::writer` (store.rs:201) and of `BlobStore::link`…\n\nclear_partials` unlinks every file in `incoming` with no age or liveness test, but that directory holds the *in-flight* temp files of `BlobStore::writer` (store.rs:201) and of `BlobStore::link` (store.rs:147). A sweep firing during a 200 MiB download deletes the file under the open handle, and `BlobWriter::commit`'s rename (store.rs:259) fails with ENOENT, turning a healthy fetch into a 500. Only files older than `min_age` (or than `fetch_timeout`) are abandoned.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 119,
      "end_line": 119,
      "label": "bug",
      "severity": "high",
      "explanation": "the \"nothing points at it\" branch ignores age, but a freshly committed blob is unreferenced for the whole of the registry round trip — cache.rs commits at line 151 and only calls `store.link` at…\n\nthe \"nothing points at it\" branch ignores age, but a freshly committed blob is unreferenced for the whole of the registry round trip — cache.rs commits at line 151 and only calls `store.link` at line 163. A sweep in that window removes the blob, and the reopen at cache.rs:90 fails with \"a blob committed by this request is already missing from the store\". Unreferenced blobs must also be older than `min_age` before they are removed.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 90,
      "end_line": 90,
      "label": "performance",
      "severity": "high",
      "explanation": "sweep` is a synchronous full-tree `read_dir`/`metadata`/`unlink` walk, and both callers run it directly on a runtime worker — `Sweeper::run` at line 84 and the handler at routes/admin.rs:76.\n\nOn the large store the module doc contemplates this parks a worker thread for the whole walk, stalling the async tasks (including in-flight artifact streams) scheduled on it. It needs `tokio::task::spawn_blocking`.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/routes/admin.rs",
      "start_line": 76,
      "end_line": 76,
      "label": "bug",
      "severity": "medium",
      "explanation": "the route calls `sweeper.sweep(...)` and not `sweeper.run()`, bypassing the `running` mutex (sweep.rs:67) that the module doc at sweep.rs:10 says makes one-sweep-at-a-time a property of the type.\n\nTwo concurrent `POST /v1/admin/cache/sweep` calls, or one racing the background tick, each size their removals against a total the other is shrinking and take the store far under the ceiling.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 164,
      "end_line": 164,
      "label": "bug",
      "severity": "medium",
      "explanation": "fs::metadata` follows symlinks, contradicting the comment on lines 160-163 — a symlink is counted at its *target's* size, and a symlinked directory inside the blob dir makes `collect` recurse…\n\nfs::metadata` follows symlinks, contradicting the comment on lines 160-163 — a symlink is counted at its *target's* size, and a symlinked directory inside the blob dir makes `collect` recurse outside the store, where its files are then unreferenced and unlinked at line 126. Use `fs::symlink_metadata` and skip non-regular files.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 120,
      "end_line": 120,
      "label": "bug",
      "severity": "low",
      "explanation": "remaining >= self.max_bytes` removes one more blob when the store is exactly at the ceiling; the ceiling is documented as the most the store *may* hold, so this should be `>`.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    }
  ]
}