Measured on the main session: 90% of development tokens were tool I/O. Three
tools from the Portal pattern:
- read_guard.py: PreToolUse hook that denies a whole-file Read over 350 lines and
points to a ranged read or the bulk reader (pipe-tested: deny, range, small).
- bulk_read.py: answers a question about files with the cheap chat model, citing
path:line, under a spend ceiling.
- token_report.py: where a session's tokens go, from its transcript.
Co-Authored-By: Claude Fable 5.1 <[email protected]>
Claude-Session: https://claude.ai/code/session_01EmM1j46qgKMh3zqD1QMwEo
