{
  "sha": "9b51f95ef609a219e211e37b082cd2e6913190e0",
  "model": "z-ai/glm-5.3-flash",
  "effort": "high",
  "found_per_pass": {
    "agent": 8
  },
  "findings": [
    {
      "path": "services/proxy/src/config.rs",
      "start_line": 83,
      "end_line": 83,
      "label": "bug",
      "severity": "critical",
      "explanation": "Duration::from_hours` (and `from_mins` at line 84, plus the test uses at 350-351) do not exist on stable `std::time::Duration` — they are unstable `duration_constructors` methods, and…\n\nDuration::from_hours` (and `from_mins` at line 84, plus the test uses at 350-351) do not exist on stable `std::time::Duration` — they are unstable `duration_constructors` methods, and `rust-toolchain.toml` pins `channel = \"stable\"` with no feature gate. The proxy does not compile; the whole sweep feature is dead on arrival.",
      "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` before `sweep_blobs_removed`, but `COUNTERS` (lines 51-57) lists `sweep_blobs_removed_total` before `sweep_bytes_reclaimed_total`, and `render` zips them…\n\nvalues()` returns `sweep_bytes_reclaimed` before `sweep_blobs_removed`, but `COUNTERS` (lines 51-57) lists `sweep_blobs_removed_total` before `sweep_bytes_reclaimed_total`, and `render` zips them positionally. Each sweep counter is published under the other's name — `cairn_proxy_sweep_bytes_reclaimed_total`, the one docs/operations.md tells operators to alert on, actually carries the blob count. This is exactly the fifth-under-fourth's-name failure the adjacent comment (line 30-32) claims the pairing prevents.",
      "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 check, but `BlobWriter` (store.rs:171-180, 242-259) keeps an open temp file there for the whole of a download — minutes for a 200 MiB…\n\nclear_partials` unlinks every file in `incoming` with no age check, but `BlobWriter` (store.rs:171-180, 242-259) keeps an open temp file there for the whole of a download — minutes for a 200 MiB artifact. A sweep concurrent with an in-flight fetch deletes that fetch's temp file, so `commit`'s rename fails and the download errors. `CAIRN_CACHE_MIN_AGE` is applied only to blobs, not partials, so even a temp file created seconds before is destroyed.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 140,
      "end_line": 140,
      "label": "bug",
      "severity": "high",
      "explanation": "forget(&index, &gone)` runs unconditionally, but `gone` is populated on dry runs too (line 137).\n\nA dry run — documented in docs/operations.md and on the route as reporting \"without removing anything\" — deletes the index entries of every blob it would have removed, degrading those coordinates to a miss-and-refetch the next time they are requested.",
      "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 on-demand handler calls `app.sweeper.sweep(dry_run)` directly instead of `run()`, so it never takes the `running` mutex (sweep.rs:83) and can run concurrently with the 15-minute background sweep…\n\nthe on-demand handler calls `app.sweeper.sweep(dry_run)` directly instead of `run()`, so it never takes the `running` mutex (sweep.rs:83) and can run concurrently with the 15-minute background sweep in main.rs:116 — the exact two-sweeps-over-one-directory hazard the module doc (sweep.rs:10-12, 65-67) claims the type prevents. Both compute `held` from the same starting total and remove independently, driving the store far below the ceiling and double-counting reclaimed bytes.",
      "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": "Sweeper::sweep` is a synchronous recursive walk plus per-blob unlinks, executed directly on a tokio worker thread — both here and via `run()` awaited in the spawned task (main.rs:116).\n\nOn a store of the size the module's own doc contemplates (65k leaf directories, sweep.rs:15), one sweep stalls a runtime worker for the duration, delaying every request multiplexed onto it. The sync-walk choice is defensible; running it outside `spawn_blocking` is the defect.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 130,
      "end_line": 130,
      "label": "bug",
      "severity": "low",
      "explanation": "when `fs::remove_file` fails, the candidate is still counted into `removed`, `bytes`, and `gone`, and its index entries are then deleted by `forget`.\n\nA persistent failure (permissions, read-only mount) inflates `sweep_bytes_reclaimed_total` on every sweep with bytes never reclaimed, and drops index entries for blobs that still exist, forcing a refetch of bytes that were present.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 205,
      "end_line": 205,
      "label": "bug",
      "severity": "low",
      "explanation": "an index entry that fails to read or parse is skipped, which leaves its digest absent from the `index` map — so the blob it points at satisfies `!index.contains_key(hex)` (line 119) and is deleted.\n\nThis is the opposite of the comment's stated intent (\"deciding here that it references no blob would delete the bytes that refetch is about to find\"); the consequence is one refetch per occurrence, tolerable but not what the code says it does.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    }
  ]
}