irisandClaude Opus 5
4a4057886d
Left at `auto` the CLI picks a very large window, which suits a terminal session somebody closes at the end of the day and does not suit this app at all: these run for hours, nobody closes them, and the transcript carries screenshots. One session here reached 491,562 tokens of context before the CLI compacted it. That matters because every API call re-reads the whole context, and one request is not one call. At half a million tokens a single tool call bills about 49k before it does anything, so "can you make it so you can rename a session?" cost 4.2 million tokens across the 130 calls it took. Measured over that session's life: 2,498 calls, 1.08 billion cache-read tokens. 100k is the smallest window the CLI accepts and roughly the cheapest. Per-call cost falls with the cap, while the compaction it forces costs about the same in total either way -- a smaller window compacts more often, but each pass is proportionally smaller. What it trades is how much detail survives a compaction, which is a real cost to the work and the reason this is one named constant with the reasoning written down rather than a computed value. Passed before the resume/name branch, so it applies to adopted and imported sessions too -- which are the large ones, and the ones this is for. Verified: the exact argument list the app now spawns starts, accepts an empty stream-json stdin and exits 0, so the flag combination is good without spending a token. 68 tests, clippy clean, rustfmt clean. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VETa8afmpWaYezLCqJhDB8