sandbox:read-only (macOS Seatbelt) -- reasoning -- I'm scanning the pr/ code for bugs. I spot a values() ordering mismatch in metrics.rs where the counters are swapped, and in sweep.rs the sort_by_key on age actually sorts oldest-last despite the comment claiming oldest-first, meaning it removes the newest blobs first. I'm also checking whether the `remaining >= self.max_bytes` comparison has an off-by-one issue. More significantly, admin::sweep calls the sweeper directly rather than going through the mutex-protected run(), breaking the "one sweep at a time" guarantee and allowing concurrent sweeps, plus the synchronous filesystem walk runs inside an async handler without spawn_blocking, which can stall the tokio worker thread on large stores. I'm also noting that clear_partials might try to remove directory entries as if they were files, and that forget gets called with the gone list even during a dry run, which seems inconsistent with dry-run semantics. Actually confirming that bug: forget(&index, &gone) is called unconditionally regardless of dry_run, meaning a "dry run" would actually delete index entries — that's a serious defect since dry runs shouldn't mutate state. I'm also flagging that Duration::from_hours and from_mins are unstable APIs that likely won't compile on stable Rust, which is worth checking against the toolchain version. The rest of the config validation and metrics recording looks fine, and I'm now looking at how the index directory read failures are handled when collecting referenced entries. There's a more serious concern about a race condition: if a fetch writes a blob to disk and only afterward writes its index entry, a sweep running in between could delete that blob before it's recorded as cached, since unreferenced blobs bypass the min_age protection entirely. I need to trace through store.rs to see the actual write order, so I'm going to read store.rs, sweep.rs, and the metrics module directly. └ 1499 tok · 79.2 tok/s · 19K ctx · 4072ms ttft · 18.9s wall ↳ glob_files: glob services/proxy/**/*.rs in pr └ glob_files: glob complete ↳ read_file: read pr/services/proxy/src/sweep.rs └ read_file: read complete ↳ read_file: read pr/services/proxy/src/metrics.rs └ read_file: read complete ↳ read_file: read pr/services/proxy/src/routes/admin.rs └ read_file: read complete auto-compress is on at 85% but the context window of "anthropic/claude-opus-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'm spotting two real bugs: in metrics.rs the values() function returns bytes_reclaimed and blobs_removed in swapped order compared to how COUNTERS lists them, so the values get mixed up. Then in sweep.rs, sorting by age ascending actually puts newest blobs first despite the comment claiming oldest-first, meaning the sweep logic removes the wrong blobs. There's also an off-by-one where `remaining >= self.max_bytes` should be `>`, since hitting the ceiling exactly shouldn't trigger removal — minor. More seriously, the admin sweep route calls sweep() directly, bypassing the running mutex and allowing concurrent sweeps, plus it runs a blocking filesystem walk on an async runtime thread instead of using spawn_blocking, which will stall request handling during large sweeps — this happens both in the main sweep loop and the admin route. I'm also noting that clear_partials wipes every file in incoming, which would delete partials from writes still in progress. I need to check store.rs's BlobWriter — if a fetch is actively writing to a temp file in incoming when the sweep runs, unlinking that file means the write continues on an unlinked inode and the final rename fails with ENOENT, breaking in-flight fetches. The docs claim files in incoming are always abandoned fetches, but that's false while a fetch is running, so there's no age check protecting active partials. I'm also flagging that forget() unconditionally deletes index entries for gone digests even during dry_run, since gone still gets populated — meaning a "dry run" can actually delete index entries, which is a serious bug. There's a smaller issue too where gone may include blobs that failed to actually delete. And I'm second-guessing whether Duration::from_hours and from_mins are stable in the Rust version being targeted, since I recall they were behind an unstable feature gate for a while. Now I'm looking at whether cache_min_age validation matters, the relationship between CAIRN_CACHE_MAX_BYTES and max_artifact_bytes, whether the sweep route lacks rate-limiting when dry_run is false, and how SweepQuery deserializes its parameters. I'm also spotting a race condition in the sweep logic: since the index is read before blobs are collected, a blob written between those two steps won't appear in the index snapshot and will get deleted as unreferenced even though it was just fetched. That could delete a blob mid-stream to a client, and leave the index pointing at a missing file for later requests. I need to check store.rs and cache.rs to see the actual write order and whether file handles stay open during deletion, so let me go read store.rs, cache.rs, config.rs, main.rs, and routes/mod.rs. └ 1869 tok · 72.6 tok/s · 28K ctx · 4371ms ttft · 25.7s wall ↳ read_file: read pr/services/proxy/src/store.rs └ read_file: read complete ↳ read_file: read pr/services/proxy/src/config.rs └ read_file: read complete ↳ read_file: read pr/services/proxy/src/routes/cache.rs └ read_file: read complete ↳ read_file: read pr/services/proxy/src/main.rs └ read_file: read complete -- reasoning -- I'm scanning for defects now. I found that in metrics.rs the values() method returns the counters in swapped order — sweep_blobs_removed_total ends up reporting bytes reclaimed and vice versa, which contradicts the doc comment describing the pairing, so that's a confirmed bug. Now I'm checking sweep.rs for a similar issue around the remaining comparison logic. The condition `remaining >= max_bytes` is technically fine as a loop terminator, just an off-by-one style edge case, not worth flagging. But there's a bigger bug in the eviction sort: candidates are sorted ascending by age, meaning the youngest blobs end up first, yet the comment claims "oldest first" — so the sweep is actually evicting the most recently fetched blobs before older ones, which combined with the min_age grace period produces a genuinely wrong eviction order. The fix should be sorting by reverse age so the truly oldest blobs come first. I'm also flagging the query extractor's plain 400 rejection on invalid dry_run values as minor, and more importantly that the admin sweep route calls `sweeper.sweep()` directly, bypassing the mutex meant to serialize sweeps — so concurrent HTTP-triggered and background sweeps can race, and worse, this synchronous full-directory walk runs inline on the async runtime without `spawn_blocking`, which can stall the whole server during a large sweep. I'm now finding an even bigger issue: dry_run mode still calls `forget()` unconditionally, which deletes index entry files even though blobs themselves aren't removed — meaning a "dry run" actually corrupts the index, which is a serious bug. I'm also noting that `clear_partials` unlinks files in `incoming` regardless of age, which could yank a file out from under an active in-progress write and break the later rename during commit. If the index is empty or missing entirely, every blob looks unreferenced and gets swept. There's also a real race: after a fetch commits a blob but before it registers and links the index, a concurrent sweep can see it as unreferenced and delete it, causing a later "blob missing from store" error — worth flagging as 🟠 at sweep.rs:119 vs store/cache.rs:90. Checking a few more minor items: dry-run reclaim counts look fine, the unstable `Duration::from_hours`/`from_mins` usage already exists elsewhere in the config tests so it's not a new issue, `cache_min_age` lacks validation but doesn't need it, and the `.env.example` comment gap is trivial. More significant: the docs claim `?dry_run=true` only reports without removing anything, but that appears to contradict what the forget function actually does. I'm walking through more spots — the sweeper wiring in main.rs, the App/Arc/Mutex setup, how dry_run affects partials and remaining byte counts, the sweep route placement, and general router/metrics sanity. I want to flag a possible extractor ordering issue: putting the Query extractor after HeaderMap might violate axum's requirement that certain extractors come last. I'm confirming the sort_by_key age direction is actually a bug: longer duration means older, so sorting ascending puts newest first, which combined with the `remaining >= max_bytes` cutoff means the sweep keeps the oldest blobs and repeatedly evicts newer hot ones — an inverted LRU. I'm also checking the `removed` counter's inferred type and how `age_of` computes elapsed time. Since blob mtime isn't refreshed on read, eviction is really tracking last-write time rather than last-access time, so a heavily used blob older than min_age gets swept just like an unused one — this contradicts the docs' claim about protecting recently-wanted packages. I'll flag this as a separate yellow-severity issue alongside the sort-order bug, then note the Cargo.toml feature additions look fine. Checking main.rs for duplicate metrics recording and confirming spawn_sweeps' dropped JoinHandle doesn't affect background sweep behavior — both fine. More significantly, `collect` uses `fs::metadata` which follows symlinks and returns the target's size, but the doc comment says a link should be counted at its own size, not the target's — that's a real code/comment mismatch, since `symlink_metadata` would match what the comment describes. If a symlink inside the blob directory points to a directory, `meta.is_dir()` would be true and `collect` would recurse into it, meaning content outside the store could become eligible for deletion — this needs an attacker-placed symlink, so it's low risk given content-addressed naming, but still worth flagging as a low-severity issue with a note about recursion escaping the store boundary. I'm also checking that `forget` correctly removes all index entries referencing a removed digest, and that `referenced` reading each index file via `fs::read` is straightforward. Now I'm thinking through the race where the cache route serves a blob while a concurrent sweep deletes it — considering whether unlinking on open protects against this. Cache_max_bytes being smaller than max_artifact_bytes could cause cache thrash, though it's more of a configuration issue than a real defect. I also want to check whether the metrics counter ordering issue means bytes reclaimed are mislabeled under the blobs counter name in the operations docs, and then verify the current routes/mod.rs file so I have accurate line numbers for the sweep route and App setup. └ 3508 tok · 69.0 tok/s · 47K ctx · 4156ms ttft · 50.8s wall MALFORMED TOOL CALL - read_file args invalid (key must be a string at line 1 column 64); retrying (1/2) HTTP 404: {"error":{"message":"No endpoints found that can handle the requested parameters. To learn more about provider routing, visit: https://openrouter.ai/docs/guides/routing/provider-selection","code":404}