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Tokens saved is the wrong headline for this feature. Micro-compaction is not an efficiency optimisation — the same summarization work happens either way. What it buys is (a) that work amortized across turns instead of one stall, and (b) a window kept low enough that a session runs much further before needing a hard compaction at all. Neither shows up in "net tokens saved". A session can save nothing on paper and still be a clear win on both counts. So the telemetry now carries occupancy: tokens_after as a share of the compaction threshold, plus the threshold and resolved window it was computed from. That is the number that says whether a session has headroom left. The report leads with it, and cross-references the batch `compression_attempt` lines already in the log so it can show how often the long pause actually fired — ideally never. Occupancy is read from the cached threshold only. The public `threshold_tokens` property resolves lazily and can issue a synchronous /models probe (#32221); telemetry must never be the thing that blocks a turn, so an unresolved window reports null. In practice a pass has already resolved it via the tail calculation, so the field is populated. A test pins the no-forcing behaviour directly against the emitter. The report is pure ASCII: `scripts/check_subprocess_stdin.py` currently dies on a cp1252 console before printing its results, and a diagnostic tool that crashes on the platform it is diagnosing is worse than no tool. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>