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reacechalmers
cb572811e1
The git diff snapshot is rendered into the *system prompt*, so its cost is paid again by every session whose working tree has changed -- and a diff changes on essentially every edit. The 50_000-char budget was four times the entire instruction-file budget (12_000) and unbounded in practical effect: a single modified file added ~15_000 tokens to the prompt. Measured against a self-hosted backend, one uncommitted change took the prompt from 8_302 to 23_457 tokens and a one-word reply from ~3 s to 296 s. With the new default the same session is 7_911 tokens and 36 s. That cost is absorbable against a hosted frontier model and ruinous against a local one. Default is now 4_000 chars, matching MAX_INSTRUCTION_FILE_CHARS, and is overridable with CLAW_MAX_GIT_DIFF_CHARS following the same pattern as CLAW_MAX_READ_CHARS. A budget of 0 omits the snapshot entirely rather than emitting an empty section with a truncation marker; git status and the recent-commit list are unaffected either way. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01RNKqVB2JE9UnCkz8FC9HPy (cherry picked from commit e01c6ea43d56a97e284ab80fa7a90a479997ed74)