sandbox:read-only (macOS Seatbelt)
-- reasoning --
The user wants me to review a pull request diff and report only defects I can point at specific lines for. Let me carefully read through the diff and the actual files under `pr/` to find concrete bugs...
I'll review the PR diff against the checked-out files under `pr/`, focusing on concrete line-level defects.
└ 139 tok ·  37.7 tok/s · 12K ctx · 1559ms ttft ·  3.7s wall
↳ glob_files: glob pr/services/proxy/src/**/*.rs in .
└ glob_files: glob complete
↳ search_files: search pr/services/proxy/src for values|COUNTERS|record_sweep|sweep
└ search_files: search complete
↳ list_dir: list pr
└ list_dir: listing complete
auto-compress is on at 85% but the context window of "x-ai/grok-4.5" on openrouter is unknown, so this run will not compress - set AFI_SOURCE_OPENROUTER_CONTEXT_WINDOW (or pass --context-window) to enable it
-- reasoning --
I found a clear metrics ordering bug. Let me dig deeper into sweep.rs, admin, store, and other related code for more defects.
Found a metrics ordering mismatch; next I'll inspect sweep logic, store layout, and admin path concurrency.
└ 186 tok ·  50.6 tok/s · 14K ctx · 1207ms ttft ·  3.7s wall
↳ read_file: read pr/services/proxy/src/metrics.rs
└ read_file: read complete
↳ read_file: read pr/services/proxy/src/sweep.rs
└ read_file: read complete
↳ read_file: read pr/services/proxy/src/routes/admin.rs
└ read_file: read complete
↳ read_file: read pr/services/proxy/src/store.rs
└ read_file: read complete
↳ read_file: read pr/services/proxy/src/main.rs
└ read_file: read complete
↳ read_file: read pr/services/proxy/src/config.rs
└ read_file: read complete
-- reasoning --
I've found several potential bugs. Let me analyze them carefully:
🔴 `bug` services/proxy/src/metrics.rs:23: COUNTERS array order does not match values() return order, swapping sweep_blobs_removed and sweep_bytes_reclaimed in Prometheus exposition
🔴 `bug` services/proxy/src/routes/admin.rs:48: sweep route calls sweeper.sweep(dry_run) without acquiring running Mutex, violating one-sweep-at-a-time guarantee
🔴 `bug` services/proxy/src/sweep.rs:124: sort_by_key on Duration (age) sorts newest blobs first instead of oldest, contrary to comment and intended eviction policy
🔴 `bug` services/proxy/src/sweep.rs: 125: forget(&index, &gone) called unconditionally after loop, removing index entries even on dry_run=true
🔴 `bug` services/proxy/src/sweep.rs: 88: clear_partials removes files from incoming directory while BlobWriter may still be writing them, causing in-flight fetch failures
🟠 services/proxy/src/sweep.rs:  99: remove_file failure still increments removed/bytes counters and calls forget, so metrics lie and index entries get deleted for blobs that remain on disk
🟡  services/proxy/src/sweep.rs:  72: collect uses fs::metadata (follows symlinks and hardlinks) instead of symlink_metadata, potentially double-counting hardlink sizes or mis-counting link targets
🟡  services/proxy/src/sweep.
Checking a few more specifics: digest hex format, whether dry-run still mutates, and how age sorting interacts with eviction.
└ 1761 tok ·  50.3 tok/s · 32K ctx · 2114ms ttft · 35.0s wall
↳ read_file: read pr/services/proxy/src/digest.rs
└ read_file: read complete
↳ search_files: search pr/services/proxy for from_hours|from_mins|spawn_blocking|dry_run|sort_by_key|clear_partials|forget
└ search_files: search complete
↳ glob_files: glob pr/services/proxy/**/*sweep* in .
└ glob_files: glob complete
↳ search_files: search pr/services/proxy for sweep|Sweeper|record_sweep|COUNTERS
└ search_files: search complete
-- reasoning --
I've identified several concrete bugs:
🔴 `bug` services/proxy/src/metrics.rs:50: COUNTERS array order (blobs_removed then bytes_reclaimed) does not match values() return order (bytes_reclaimed then blobs_removed) at lines 94-95, causing Prometheus metrics to be swapped
🔴 `bug` services/proxy/src/s sweep.rs:139: sweep() calls forget() unconditionally even when dry_run=true, deleting index entries for digests that would have been kept, so dry_run is destructive
🔴 `bug` services/proxy/src/sweep.rs:139: sweep() calls forget() unconditionally even when dry_run=true, deleting index entries for digests that would have been kept, so dry_run is destructive
🟠 `bug` services/proxy/src/sweep.rs:132: candidates.sort_by_key(|candidate| candidate.age) sorts ascending (newest first) but comment claims "Oldest first", and removal condition prefers youngest eligible blobs when over ceiling
🟠 `bug` services/proxy/src/sweep.rs:132: candidates.sort_by_key(|candidate| candidate.
Checking edition/MSRV and a few more edge cases around partials and age sort.
└ 1466 tok ·  57.5 tok/s · 35K ctx · 1039ms ttft · 25.5s wall
↳ read_file: read pr/services/proxy/Cargo.toml
└ read_file: read complete
↳ search_files: search pr for rust-version|editions|from_mins|from_hours
└ search_files: search complete
↳ read_file: read pr/services/proxy/src/routes/mod.rs
└ read_file: read complete
↳ search_files: search pr/services/proxy/src/sweep.rs for fs::metadata|symlink_metadata|len\(\)
└ search_files: search complete
-- reasoning --
I've identified several concrete defects. Let me carefully verify each:
🔴 `bug` services/proxy/src/metrics.rs:94: COUNTERS and values() disagree on order of sweep counters
🔴 `bug` services/proxy/src/sweep.rs:140: forget() called unconditionally on dry_run
🔴 `bug` services/proxy/src/sweep.rs:102: sort_by_key puts newest blobs first instead of oldest
🔴 `bug` services/proxy/src/routes/admin.rs:76: admin::sweep calls sweeper.sweep() without mutex
🔴 `bug` services/proxy/src/sweep.rs:78: clear_partials removes active download files from incoming
🔴 `bug` services/proxy/src/sweep.rs:125: failed remove_file still increments removed/bytes and calls forget
🟠 `bug` services/proxy/src/sweep.rs:78: clear_partials removes in-flight downloads (BlobWriter temp files)
🟠 `bug` services/proxy/src/sweep.rs:102: remaining >= max_bytes continues removing when remaining == max_bytes
🟡 `bug` services/proxy/src/sweep.rs:78: fs::metadata follows symlinks but comment claims it reports link size
🟡 `bug` services/proxy/src/sweep.rs:78: hard links counted multiple times if duplicated under 64-char dir
🟡 `bug` services/proxy/src/sweep.rs:102: sweep aims for remaining < max_bytes instead of <=
🟡 `bug` services/proxy/src/main.
Here are the line-level defects:

🔴 `bug` services/proxy/src/sweep.rs:224: `clear_partials` deletes every file in `incoming` with no age/ownership check, so a sweep mid-fetch removes live `BlobWriter` temps and the later `rename` in `commit` fails
🔴 `bug` services/proxy/src/sweep.rs:102: `sort_by_key(|c| c.age)` orders youngest first, but eviction assumes oldest first—over-ceiling sweeps remove newly eligible blobs and keep the coldest ones
🔴 `bug` services/proxy/src/sweep.rs:140: `forget` always deletes index entries for would-be victims, so `dry_run=true` still unlinks index files and turns hits into misses
🟠 `bug` services/proxy/src/routes/admin.rs:76: admin calls `sweep` directly and skips `running`, so on-demand and background sweeps can run together and over-delete past the ceiling
🟠 `bug` services/proxy/src/metrics.rs:94: `values()` emits `sweep_bytes_reclaimed` then `sweep_blobs_removed`, but `COUNTERS` names them in the opposite order, so Prometheus scrapes swapped figures
🟠 `bug` services/proxy/src/sweep.rs:126: a failed `remove_file` still counts the blob toward `removed`/`bytes` and still pushes it to `gone`, so index entries are dropped and metrics report space that was not reclaimed
🟠 `perf` services/proxy/src/sweep.rs:84: the full filesystem walk runs inline on the async worker (also via `admin`’s sync `reclaim`), so a large store stalls the runtime until the sweep finishes
🟡 `bug` services/proxy/src/sweep.rs:164: comment claims symlink size is the link size, but `fs::metadata` follows links and counts the target, so shared/symlinked blobs inflate `held` and trigger excess eviction
└ 2152 tok ·  54.0 tok/s · 37K ctx ·  911ms ttft · 39.9s wall