{"answer":"Now I have enough context. Let me verify the key relationships one more time around the mutex and the two call sites.\n\nThe relevant facts:\n- `Sweeper::run` (sweep.rs:82-85) acquires `self.running` (`tokio::sync::Mutex`) and then calls `self.sweep(false)`.\n- `Sweeper::sweep` (sweep.rs:90) does **not** touch the mutex.\n- The background task calls `run()` (main.rs:116).\n- The admin route calls `sweep(dry_run)` directly (admin.rs:76), bypassing `run()` and therefore the mutex.\n- The module doc (sweep.rs:10-12) promises \"one sweep at a time\" and explains why two concurrent sweeps would drive the store far below the ceiling.\n\nHere are my findings:\n\n🟠 `concurrency` services/proxy/src/routes/admin.rs:76: the on-demand sweep calls `app.sweeper.sweep(dry_run)` directly instead of the locking `run()`, so an admin-triggered sweep runs concurrently with the background sweep. `Sweeper::sweep` (sweep.rs:90) takes no lock while `run` (sweep.rs:82-84) holds `running`; both walks compute `held` from the same files and each independently removes down to `cache_max_bytes`, so together they reclaim roughly twice the excess — exactly the \"far below the ceiling\" case the module doc at sweep.rs:10-12 says the mutex exists to prevent.\n\n🟡 `race` services/proxy/src/sweep.rs:230: `clear_partials` deletes every file in `incoming` with no age check and no exclusion of files being written, so a sweep that fires while a fetch is in progress `fs::remove_file`s that fetch's temp file out from under its `BlobWriter`. On Unix the open fd keeps the writes alive, but `BlobWriter::commit`'s `fs::rename(&temp, &target)` (store.rs:259) then fails with `NotFound`, failing the in-flight download. The doc comment (\"a file in `incoming` is a fetch that is not coming back\") is only true for abandoned partials, not for the long-running 200 MiB fetches the cache is sized for.\n\n🟡 `performance` services/proxy/src/sweep.rs:90: `sweep` performs the full walk (`read_dir`/`metadata`/`read`/`remove_file`) synchronously and is invoked from async contexts — the background task (main.rs:116 via `run`) and the admin handler (admin.rs:76) — without `spawn_blocking`, so a store walk over the 32 GiB ceiling blocks a tokio worker thread for the whole pass and stalls every other request sharing that thread. The module's justification (sweep.rs:14-18) argues the std calls are cheaper than `tokio::fs` scheduling, but the cost at issue is blocking the runtime, not the syscall count.\n\nNo findings.","auth":{"mode":"api_key"},"effort":"high","elapsed_secs":174.262,"error":null,"error_kind":null,"instructions":[],"model":"z-ai/glm-5.2","ok":true,"sandbox":{"backend":"macOS Seatbelt","denied_read_roots":[],"environment":["HOME","LANG","LC_ALL","PATH","TERM","TMPDIR"],"mode":"read-only","network":"denied","protected_write_roots":["/Users/bart.smykla@konghq.com/Projects/github.com/smykla-skalski/benchee/.git","/Users/bart.smykla@konghq.com/Projects/github.com/smykla-skalski/benchee/.afi","/Users/bart.smykla@konghq.com/Projects/github.com/smykla-skalski/benchee/.agents","/Users/bart.smykla@konghq.com/Projects/github.com/smykla-skalski/benchee/.codex","/Users/bart.smykla@konghq.com/Projects/github.com/smykla-skalski/benchee/AGENTS.md","/Users/bart.smykla@konghq.com/Projects/github.com/smykla-skalski/benchee/CLAUDE.md"],"readable_paths":["/"],"readable_roots":["/Users/bart.smykla@konghq.com/Projects/github.com/smykla-skalski/benchee","/Users/bart.smykla@konghq.com/Projects/github.com/smykla-skalski/benchee/.git","/bin","/sbin","/usr/bin","/usr/sbin","/usr/lib","/usr/libexec","/usr/share","/System/Library","/Library/Apple","/Library/Filesystems/NetFSPlugins","/Library/Preferences","/private/etc","/private/var/db/timezone","/private/var/db/DarwinDirectory/local/recordStore.data","/private/var/select/developer_dir","/private/var/select/sh","/opt/homebrew/bin","/opt/homebrew/Cellar","/opt/homebrew/etc/gitconfig","/opt/homebrew/lib","/opt/homebrew/opt","/usr/local/bin","/Applications/Xcode.app/Contents/Developer","/Applications/Xcode.app/Contents","/Users/bart.smykla@konghq.com/.local/bin/afi"],"writable_roots":["/private/var/folders/d1/tvmyp5cs1gz38rltf390ddpw0000gn/T/afi-sandbox-Oc2T8b"]},"schema_version":1,"source":"openrouter","sources":[{"auth":{"mode":"api_key"},"source":"openrouter","usage":{"cache_read_tokens":307584,"cache_write_tokens":0,"cost_usd":0.197828,"estimated_tokens":0,"input_tokens":74111,"output_tokens":1219,"reasoning_tokens":9813,"requests":16,"total_tokens":392727}}],"system_prompt":{"file":null,"mode":"builtin"},"tools":["read_file","write_file","edit_file","list_dir","search_files","glob_files","run_bash","wait_background"],"usage":{"budget":{"converged":false,"hard_ratio":0.95,"limit_usd":2.0,"soft_ratio":0.8,"spent_usd":0.197828,"stopped":false},"cache_read_tokens":307584,"cache_write_tokens":0,"cost_usd":0.197828,"estimated_tokens":0,"input_tokens":74111,"output_tokens":1219,"reasoning_tokens":9813,"refused_by_approval":1,"refused_by_policy":0,"refused_tool_calls":1,"requests":16,"total_tokens":392727}}