{
  "sha": "9b51f95ef609a219e211e37b082cd2e6913190e0",
  "model": "anthropic/claude-fable-5",
  "effort": "high",
  "found_per_pass": {
    "agent": 7
  },
  "findings": [
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 140,
      "end_line": 140,
      "label": "bug",
      "severity": "critical",
      "explanation": "forget` is called unconditionally, so a `dry_run=true` sweep deletes the real index entries (`fs::remove_file` at line 252) for every blob it merely *would* have removed.\n\nA \"dry\" run therefore mutates the store: those coordinates become misses, and the now-unreferenced blobs are deleted by the next real sweep regardless of ceiling or age — the exact opposite of the route's \"reports without removing anything\" contract.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 232,
      "end_line": 232,
      "label": "bug",
      "severity": "critical",
      "explanation": "clear_partials` unlinks every file in `incoming/` with no age or ownership check, but that directory holds the temp files of downloads *currently in flight* (`BlobStore::temp_path`, store.rs:201)…\n\nclear_partials` unlinks every file in `incoming/` with no age or ownership check, but that directory holds the temp files of downloads *currently in flight* (`BlobStore::temp_path`, store.rs:201) and of index writes (`link`, store.rs:148). A sweep landing during a fetch unlinks the temp file, so the later `fs::rename` in `BlobWriter::commit` (store.rs:259) or `link` (store.rs:152) fails with NotFound and the client request 500s; every download active at each 15-minute sweep is at risk.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 119,
      "end_line": 119,
      "label": "bug",
      "severity": "high",
      "explanation": "unreferenced blobs are removed with no `min_age` grace, but on the miss path a blob is committed to `blobs/` (cache.rs:151) before its index entry is written (cache.rs:163) — with a registry network…\n\nunreferenced blobs are removed with no `min_age` grace, but on the miss path a blob is committed to `blobs/` (cache.rs:151) before its index entry is written (cache.rs:163) — with a registry network round-trip in between. A sweep in that window sees a fresh, referenced-in-a-moment blob as orphaned, deletes it, and the request fails with the \"blob committed by this request is already missing\" 500 at cache.rs:90-97.",
      "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` before `sweep_blobs_removed`, but `COUNTERS` (lines 50-57) lists `cairn_proxy_sweep_blobs_removed_total` first, so each value is exported under the other…\n\nvalues()` loads `sweep_bytes_reclaimed` before `sweep_blobs_removed`, but `COUNTERS` (lines 50-57) lists `cairn_proxy_sweep_blobs_removed_total` first, so each value is exported under the other counter's name — the exact swap the comment above `COUNTERS` warns about; dashboards/alerts on `sweep_bytes_reclaimed_total` will show blob counts.",
      "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": "both compute removal sets from the same snapshot, over-evict below the ceiling, and double-count the reclaimed bytes in metrics.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/routes/admin.rs",
      "start_line": 76,
      "end_line": 76,
      "label": "performance",
      "severity": "medium",
      "explanation": "Sweeper::sweep` is a synchronous walk of the whole store (up to 65k directories plus the full index) called directly from an async handler (and from the async task via `run()` at sweep.rs:84) with…\n\nSweeper::sweep` is a synchronous walk of the whole store (up to 65k directories plus the full index) called directly from an async handler (and from the async task via `run()` at sweep.rs:84) with no `spawn_blocking`, so a sweep of a large store pins a tokio worker thread for its entire duration and stalls every other task scheduled on it.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 120,
      "end_line": 120,
      "label": "bug",
      "severity": "low",
      "explanation": "the eviction condition `remaining >= self.max_bytes` removes a blob when the store is exactly at the ceiling, contradicting the config's definition of `cache_max_bytes` as \"the most the blob store…\n\nthe eviction condition `remaining >= self.max_bytes` removes a blob when the store is exactly at the ceiling, contradicting the config's definition of `cache_max_bytes` as \"the most the blob store may hold\" (config.rs:63); should be `>`.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    }
  ]
}