Stock tclsh treats any leading-dash arg other than -encoding as argv for an
interactive/stdin session: on a console it hangs at a prompt, with piped stdin
it exits 0 silently ignoring the supposed one-liner. Agents habitually reach
for -e (perl/python/node reflex), wasting time waiting on hung processes.
- root AGENTS.md User Preferences: document the misparse, the correct patterns
(temp .tcl file or script via stdin) and the defensive stdin-redirect habit
- .claude/settings.json: PreToolUse hook denying Bash/PowerShell invocations
of tclsh with -e, anchored to command position (start/pipe/semicolon/paren)
so prose mentions in commit messages or grep args do not false-positive;
corrective guidance returned to the agent
- .gitignore: narrow the .claude ignore so shared settings.json is tracked
while session-local files stay ignored
- .fossil-settings: ignore-glob hand-derived per the no-negation rule
(.claude/* wholesale + explicit fossil add of settings.json), exception set
in AGENTS.md updated; fossil extras under-ignore check verified empty
Assisted-by: harness=claude; primary-model=claude-fable-5; api-location=anthropic.com
Julian Noble