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`BUZZ_AGENT_MAX_HANDOFFS` compared against the session-cumulative `handoff_count` (persisted across prompts). After N handoffs a long-lived session hit the cap permanently: `maybe_handoff()` returned `Skipped` on every subsequent prompt, the 16 MiB byte-truncation fallback never bound before a 1M-token provider wall, and the session wedged on the first 400 with no recovery path. Thufir's session log shows 8 days of cap-forced truncation before the first `context_length_exceeded` 400. The fix replaces the session-level cap comparison with a local `handoff_attempts` counter constructed at the start of `run()` and passed into `maybe_handoff()`. The counter resets on every `session/prompt` turn so `BUZZ_AGENT_MAX_HANDOFFS` caps compaction loops within a single turn while allowing unbounded compactions across a session's lifetime. The session-cumulative `handoff_count` is retained for log context only and is not reset. Steer-driven rounds share the per-turn budget automatically since steers inject into the running `run()` loop, not a new call. - Move `handoff_attempts` increment to before `summarize()` so failed, empty, and cancelled summarize calls each consume one budget slot — the cap cannot be bypassed by a repeatedly-failing summarizer - Upgrade cap-forced `Skipped` from `INFO` to `WARN`; add structured fields for `session_id`, attempt count, projected tokens, and threshold so the cap→wall pairing is attributable per session - Document `max_handoffs` in `config.rs` as a per-`session/prompt`-turn bound - Three new behavioral regression tests: per-turn reset proven across two separate turns; within-turn cap proven via multi-round tool-call turn; failed summarize proven to burn the attempt budget Note: this is the proactive half of the context-window fix. The reactive `context_length_exceeded` 400 recovery path is owned by Sami's branch (`buzz-ctxfix-sami`, Tyler's crew); this PR is intended to land after that one. --------- Signed-off-by: Will Pfleger <pfleger.will@gmail.com> Co-authored-by: npub1mn7jgtj4w2pd0g0zeuhxsa6jy6p0rewxz4kujt98my82ahfmp72sxjexk7 <dcfd242e557282d7a1e2cf2e6877522682f1e5c6156dc92ca7d90eaedd3b0f95@buzz.block.builderlab.xyz>