Built-in PreToolUse hook mode for ganja evaluate

What it does

Gives ganja evaluate a hook mode of its own (for example --hook pretooluse with thresholds as flags), so a PreToolUse gate in ganja.toml is one command line instead of a shell script.

Source

ganja-code-l8n4 (a built-in PreToolUse hook mode for ganja evaluate in place of the sh and awk recipe).

The bead is closed when this issue is published, with its external reference pointing here (#38).

File and line references in this issue are to main as of 75a7a92.

Against the three criteria

• Direction (README): The README does not mention Jev or evaluate. The nearest passage is the isolation bullet (README.md:23-27).
• Today's terminal users: A user of the PreToolUse gate gets thresholds that the command-line parser validates, and loses a failure class: the recipe has to pin LC_ALL=C (docs/recipes/typesafe-pretooluse-hook.sh:19) because under a comma-decimal locale awk reads "0.92" as 0 and the gate fails open silently.
• Evidence: The gate today is docs/recipes/typesafe-pretooluse-hook.sh, 132 lines of sh and awk; no --hook flag exists. The owner chose on 2026-09-19 not to start it.

Depends on

It does not need the judge seam: it is a mode of the existing command (D564). Its reopening is tied to #59.

Verdict

• Verdict: park
• Reopens: when #59 (the judge seam) is built.
• Exception to the probe rule: no.
• Date: 2026-09-19
• Verdict ticket: #47

Theme: #50

Start with docs/recipes/typesafe-pretooluse-hook.sh and the existing ganja evaluate command; compare the recipe’s thresholds and locale handling with the command’s current parser. Check #59 before beginning, since the issue says this work reopens only after the judge seam is built. Done means ganja evaluate supports a native --hook pretooluse mode with threshold flags, replacing the shell and awk recipe.