{
  "sha": "9b51f95ef609a219e211e37b082cd2e6913190e0",
  "model": "anthropic/claude-fable-5",
  "effort": "high",
  "found_per_pass": {
    "agent": 10
  },
  "findings": [
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 140,
      "end_line": 140,
      "label": "bug",
      "severity": "critical",
      "explanation": "forget(&index, &gone)` runs even when `dry_run` is true, so a \"report only\" dry run permanently deletes the index entries for every blob it would have removed — the blobs become unreachable cache…\n\nforget(&index, &gone)` runs even when `dry_run` is true, so a \"report only\" dry run permanently deletes the index entries for every blob it would have removed — the blobs become unreachable cache misses and are collected as unreferenced garbage by the next real sweep, making `?dry_run=true` destructive despite the route's promise.",
      "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)` sorts ascending, putting the *youngest* blobs first, so the eviction loop removes the most recently fetched blobs first — the exact opposite of the \"Oldest first\" comment and…\n\nsort_by_key(|c| c.age)` sorts ascending, putting the *youngest* blobs first, so the eviction loop removes the most recently fetched blobs first — the exact opposite of the \"Oldest first\" comment and of the documented `CAIRN_CACHE_MAX_BYTES` behaviour; the hot working set is evicted while the stalest blobs survive.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 230,
      "end_line": 230,
      "label": "bug",
      "severity": "critical",
      "explanation": "clear_partials` unlinks every file in `incoming/` with no age check, but `BlobStore::temp_path` (store.rs:201) puts *live* in-flight downloads there; each sweep unlinks the temp files of concurrent…\n\nclear_partials` unlinks every file in `incoming/` with no age check, but `BlobStore::temp_path` (store.rs:201) puts *live* in-flight downloads there; each sweep unlinks the temp files of concurrent fetches, whose `commit` rename (store.rs:259) then fails, so every sweep fails all downloads in flight at that moment.",
      "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()` loads `sweep_bytes_reclaimed` at index 4 and `sweep_blobs_removed` at index 5, but `COUNTERS` puts `..._blobs_removed_total` at index 4 and `..._bytes_reclaimed_total` at index 5, so the…\n\nvalues()` loads `sweep_bytes_reclaimed` at index 4 and `sweep_blobs_removed` at index 5, but `COUNTERS` puts `..._blobs_removed_total` at index 4 and `..._bytes_reclaimed_total` at index 5, so the two new counters are rendered under each other's names — the exact mix-up the comment above `COUNTERS` warns about, and the ops doc tells operators to alert on the misrendered `cairn_proxy_sweep_bytes_reclaimed_total`.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/routes/admin.rs",
      "start_line": 76,
      "end_line": 76,
      "label": "bug",
      "severity": "high",
      "explanation": "the admin route calls `app.sweeper.sweep(dry_run)` directly, bypassing the `running` mutex that only `Sweeper::run` takes (sweep.rs:83), so an admin-triggered sweep can run concurrently with the…\n\nthe admin route calls `app.sweeper.sweep(dry_run)` directly, bypassing the `running` mutex that only `Sweeper::run` takes (sweep.rs:83), so an admin-triggered sweep can run concurrently with the background sweep (or with another admin sweep) — the exact double-sweep over-eviction the module doc at sweep.rs:10-12 says the mutex exists to prevent.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 119,
      "end_line": 119,
      "label": "bug",
      "severity": "high",
      "explanation": "an unreferenced blob is removed with no `min_age` grace, but a blob is legitimately unreferenced in the window between `writer.commit()` (cache.rs:151) and `store.link` (cache.rs:163), which spans a…\n\nan unreferenced blob is removed with no `min_age` grace, but a blob is legitimately unreferenced in the window between `writer.commit()` (cache.rs:151) and `store.link` (cache.rs:163), which spans a registry round-trip; a sweep in that window deletes the freshly committed blob and the request 500s at cache.rs:90 (\"a blob committed by this request is already missing\").",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 84,
      "end_line": 84,
      "label": "performance",
      "severity": "high",
      "explanation": "run()` (and the admin handler via admin.rs:76) executes the fully synchronous walk-and-unlink `sweep()` directly on a tokio worker thread instead of `spawn_blocking`; the router comment in…\n\nrun()` (and the admin handler via admin.rs:76) executes the fully synchronous walk-and-unlink `sweep()` directly on a tokio worker thread instead of `spawn_blocking`; the router comment in routes/mod.rs concedes a sweep \"legitimately takes longer than ten seconds\", so a large store blocks an async runtime worker for that whole time.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/main.rs",
      "start_line": 108,
      "end_line": 108,
      "label": "bug",
      "severity": "medium",
      "explanation": "tokio::time::interval` completes its first tick immediately, so the first sweep runs at startup — the doc comment at lines 101-102 claims the first tick is one interval away precisely to avoid this;…\n\ntokio::time::interval` completes its first tick immediately, so the first sweep runs at startup — the doc comment at lines 101-102 claims the first tick is one interval away precisely to avoid this; `interval_at(Instant::now() + period, period)` is what the comment describes.",
      "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, so a link is counted at the size of its *target* (and a symlinked directory is recursed into and its contents unlinked), the inverse of the comment's claim that \"a…\n\nfs::metadata` follows symlinks, so a link is counted at the size of its *target* (and a symlinked directory is recursed into and its contents unlinked), the inverse of the comment's claim that \"a link is counted at the size of the link\"; `symlink_metadata` is what the comment describes.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 134,
      "end_line": 134,
      "label": "bug",
      "severity": "low",
      "explanation": "when `fs::remove_file` fails on line 126, the blob is still counted in `removed`/`bytes`/`remaining` and pushed to `gone`, so the reported reclaim overstates reality and `forget` deletes the index…\n\nwhen `fs::remove_file` fails on line 126, the blob is still counted in `removed`/`bytes`/`remaining` and pushed to `gone`, so the reported reclaim overstates reality and `forget` deletes the index entries of a blob that is still on disk, orphaning it until a later sweep.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    }
  ]
}