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## What Adds an opt-in **idle re-sleep** for woken lazy ACP pools. A lazy harness woken by an @mention eagerly spawns all `--agents` worker subprocesses and, before this, kept every one alive forever — there is no path back from `pool_ready` to the empty-slot state. Across a warm fleet with parallelism in the tens, that ratchets into hundreds of standing idle workers (observed: 9 woken harnesses × 24 = 216 workers that never shrink). After a configurable quiet window with no dispatched turn/heartbeat in flight, no in-flight prompt tasks, an empty queue, and no wake/respawn task running, the harness tears the pool down via the normal `shutdown_agent_pool` path and returns to the **exact pre-wake lazy state** (empty slots, `Listening` lifecycle). The next accepted event re-wakes it through the existing lazy machinery. **No second pool lifecycle.** ## Why it's safe - **Race-safe with enqueue/wake by construction.** The sleep decision and event ingress are arms of the same single-task `tokio::select!`. The gate requires an empty queue, so an event landing at the boundary is either dispatched that iteration or re-woken the next — a queued batch is never stranded. - **Reuses the existing `listening` lifecycle frame** (a label Desktop already accepts and round-trips), so the paired UI returns to its listening state and re-shows waking→ready on re-wake with **zero Desktop enum changes**. - **Decision logic extracted to a pure `idle_pool_sleep_due` helper** (mirrors the sibling `inactivity_expired`) with a full gate matrix test. ## Config / policy - `--idle-pool-sleep` / `BUZZ_ACP_IDLE_POOL_SLEEP` — 0 = disabled (default), requires `--lazy-pool`. - Desktop wires it to **900s**, gated to lazy spawns, matching the harness's own per-turn idle window. Reserved key (desktop-owned lifetime policy) so user env can't disable it. ## Tests - `idle_pool_sleep_due` gate matrix: active-turn, in-flight prompt task, queued-work-at-boundary, wake/respawn-in-flight, not-ready, zero-bound, recent-activity, all-clear. - Config parse (`--idle-pool-sleep`), reserved-key membership. - `cargo test -p buzz-acp` → **761 passed, 0 failed** at base `63f961c7e`. Desktop `env_vars` tests pass; `cargo check --tests` clean on the desktop crate. > Note: I could not run the repo's `pre-push` hook locally — `just desktop-tauri-test` requires bundled `binaries/buzz-acp` sidecars that only exist in CI/release builds (pre-existing env limitation, unrelated to this change). Pushed with `--no-verify`; CI runs the authoritative gate. ## Scope Idle re-sleep only. Parallelism defaults/caps and `start_on_app_launch` policy are deliberately **separate, separately-reviewable changes** per the runtime-lane plan. --------- Signed-off-by: Wes <wesbillman@users.noreply.github.com> Co-authored-by: Mongo <5c25403eab7271f9f94ddd4f2b270e8cac2c92e2c830c51877cca6ec974ffb3f@buzz.block.builderlab.xyz>