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fix(hooks): bootstrap hook injects context via plain stdout #6

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Merged
roadhero merged 1 commit into from
Sep 14, 2026
Merged

fix(hooks): bootstrap hook injects context via plain stdout #6

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12 changes: 7 additions & 5 deletions hooks/bootstrap-claude-md.sh
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Original file line number Diff line number Diff line change
@@ -1,8 +1,8 @@
#!/usr/bin/env bash
# SessionStart hook -- offer to bootstrap a project CLAUDE.md when the repo has none.
#
# Emits a one-line nudge (as additionalContext) telling Claude to act on the
# project-bootstrap policy (CLAUDE.md section 4C). Stays completely silent unless
# Emits a one-line nudge on stdout (the documented SessionStart context idiom) telling
# Claude to act on the project-bootstrap policy (CLAUDE.md section 4C). Silent unless
# ALL of these hold:
# - the session's directory is inside a git work tree,
# - the work-tree root is not the home directory (never bootstrap a dotfiles-in-$HOME
Expand All @@ -14,8 +14,8 @@
# the tool's own target" rule (STRUCTURE.md).
#
# Contract: reads the SessionStart JSON payload on stdin (uses .cwd), prints either
# nothing or one hookSpecificOutput JSON object, and exits 0. Requires jq and git,
# already hard dependencies of this config's hooks.
# nothing or one line of context to stdout, and exits 0. Requires jq (to read the
# payload) and git, already hard dependencies of this config's hooks.

set -u

Expand All @@ -42,5 +42,7 @@ canon=$(cd "$home" 2>/dev/null && pwd -P 2>/dev/null)

msg="This repository has no CLAUDE.md at its root. Follow the project-bootstrap policy (CLAUDE.md section 4C): offer to create one before doing other work, and create it only if the user agrees. On yes, if the repo is essentially empty use the new-repo skill; otherwise create ./CLAUDE.md from the standard template at ~/.claude/templates/CLAUDE.project.md, fill the section 19 fields you can confidently detect now (stack, quality-gate commands), and leave the rest as TODO to complete as specs appear. Never overwrite an existing CLAUDE.md."

jq -cn --arg c "$msg" '{hookSpecificOutput:{hookEventName:"SessionStart",additionalContext:$c}}'
# Plain-text stdout is the documented way a SessionStart hook injects context Claude
# can see; print the nudge and exit clean.
printf '%s\n' "$msg"
exit 0
5 changes: 3 additions & 2 deletions tests/hooks/test-bootstrap-claude-md.sh
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Expand Up @@ -21,10 +21,11 @@ feed() {
jq -n --arg c "$1" '{hook_event_name:"SessionStart",source:"startup",cwd:$c}' | bash "$HOOK" 2>/dev/null
}

# emitted <stdout> <rc> : 0 when it is a valid SessionStart nudge with non-empty context
# emitted <stdout> <rc> : 0 when a non-empty nudge was printed to stdout (the documented
# SessionStart context idiom is plain text) and exit was clean
emitted() {
[ "$2" -eq 0 ] || return 1
printf '%s' "$1" | jq -e '.hookSpecificOutput | .hookEventName == "SessionStart" and (.additionalContext | length > 0)' >/dev/null 2>&1
[ -n "$1" ] && printf '%s' "$1" | grep -q "no CLAUDE.md at its root"
}

# silent <stdout> <rc> : 0 when nothing was emitted and exit was clean
Expand Down