{"answer":"Reviewed `pr/services/proxy/src/sweep.rs`, `pr/services/proxy/src/metrics.rs`, `pr/services/proxy/src/routes/admin.rs`, `pr/services/proxy/src/main.rs`, `pr/services/proxy/src/routes/mod.rs`, `pr/services/proxy/src/config.rs`, and `pr/services/proxy/Cargo.toml`.\n\n🔴 `bug` services/proxy/src/sweep.rs:102: `candidates.sort_by_key(|candidate| candidate.age)` sorts ascending, so the smallest `age` (most recently modified, i.e. newest) blob is first and the largest `age` (oldest, longest-unwanted) blob is last. The removal loop that follows walks the vector front-to-back and stops once `remaining < self.max_bytes`, so it evicts the *newest* blobs first and leaves the truly stale ones in place until every newer blob has already gone — the opposite of the \"oldest blobs go, this morning's fetch stays\" behaviour the comment above it and `docs/operations.md`/`docs/architecture.md` describe. Fix by sorting oldest-first, e.g. `sort_by_key(|c| std::cmp::Reverse(c.age))`.\n\n🟠 `bug` services/proxy/src/sweep.rs:140: `forget(&index, &gone)` runs unconditionally, even when `dry_run` is true. `gone` is populated for every candidate that satisfied the `remove` condition regardless of `dry_run` (the file removal itself is the only thing gated on `!dry_run`, at line 125), so a dry run actually deletes the on-disk index-entry files for those digests via `fs::remove_file` inside `forget`. This contradicts the documented contract that `?dry_run=true` \"reports what a sweep would reclaim without removing anything\" (docs/operations.md, routes/admin.rs:58-60) — a preview call leaves the store's index mutated.\n\n🟠 `bug` services/proxy/src/metrics.rs:94: The order of `values()` (`sweep_bytes_reclaimed` then `sweep_blobs_removed`) does not match the order of `COUNTERS` (`cairn_proxy_sweep_blobs_removed_total` then `cairn_proxy_sweep_bytes_reclaimed_total`, metrics.rs:50-57), so `render()` zips them and prints the bytes-reclaimed value under the `..._blobs_removed_total` name and the blobs-removed value under `..._bytes_reclaimed_total`. This is exactly the mistake the adjacent doc comment (\"Keeping the two side by side is what stops a fifth counter from being rendered under a fourth one's name\") warns against, and it breaks the alert `docs/operations.md` tells operators to watch (`cairn_proxy_sweep_bytes_reclaimed_total`), since that metric will actually be a blob count.\n\n🟠 `bug` services/proxy/src/routes/admin.rs:76: The on-demand sweep route calls `app.sweeper.sweep(dry_run)` directly instead of `app.sweeper.run()`, bypassing the `running: Mutex<()>` in `Sweeper` (services/proxy/src/sweep.rs:67,82-85) that the module's own doc comment (sweep.rs:10-12) says exists to guarantee \"one sweep at a time.\" A request to `POST /v1/admin/cache/sweep` while the background interval sweep (main.rs:116, via `Sweeper::run`) is in flight runs concurrently against the same directory, which per the module's own reasoning can \"take the store far below the ceiling either was aiming at.\"","auth":{"mode":"api_key"},"effort":"high","elapsed_secs":300.294,"error":null,"error_kind":null,"instructions":[],"model":"anthropic/claude-sonnet-5","ok":true,"sandbox":{"backend":"macOS Seatbelt","denied_read_roots":["/Users/bart.smykla@konghq.com/Projects/github.com/smykla-skalski/benchee/subjects"],"environment":["HOME","LANG","LC_ALL","PATH","TERM","TMPDIR"],"mode":"read-only","network":"denied","protected_write_roots":["/private/var/folders/d1/tvmyp5cs1gz38rltf390ddpw0000gn/T/benchee-agent-5CwmLq/.git","/private/var/folders/d1/tvmyp5cs1gz38rltf390ddpw0000gn/T/benchee-agent-5CwmLq/.afi","/private/var/folders/d1/tvmyp5cs1gz38rltf390ddpw0000gn/T/benchee-agent-5CwmLq/.agents","/private/var/folders/d1/tvmyp5cs1gz38rltf390ddpw0000gn/T/benchee-agent-5CwmLq/.codex","/private/var/folders/d1/tvmyp5cs1gz38rltf390ddpw0000gn/T/benchee-agent-5CwmLq/AGENTS.md","/private/var/folders/d1/tvmyp5cs1gz38rltf390ddpw0000gn/T/benchee-agent-5CwmLq/CLAUDE.md"],"readable_paths":["/"],"readable_roots":["/private/var/folders/d1/tvmyp5cs1gz38rltf390ddpw0000gn/T/benchee-agent-5CwmLq","/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-6tr85B"]},"schema_version":1,"source":"openrouter","sources":[{"auth":{"mode":"api_key"},"source":"openrouter","usage":{"cache_read_tokens":0,"cache_write_tokens":0,"cost_usd":0.513286,"estimated_tokens":0,"input_tokens":118133,"output_tokens":1747,"reasoning_tokens":25955,"requests":4,"total_tokens":145835}}],"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":8.0,"soft_ratio":0.8,"spent_usd":0.513286,"stopped":false},"cache_read_tokens":0,"cache_write_tokens":0,"cost_usd":0.513286,"estimated_tokens":0,"input_tokens":118133,"output_tokens":1747,"reasoning_tokens":25955,"refused_by_approval":0,"refused_by_policy":0,"refused_tool_calls":0,"requests":4,"total_tokens":145835}}