Initial commit

.claude/hooks/bash-guard.sh

@@ -0,0 +1,44 @@
+#!/usr/bin/env bash
+# Tier 1 — blocks dangerous shell invocations the agent shouldn't run
+# autonomously. Reads PreToolUse JSON on stdin; exits 2 with stderr to block,
+# 0 to allow. Reinforces the Git Safety Protocol in CLAUDE.md.
+
+set -euo pipefail
+
+input=$(cat)
+cmd=$(printf '%s' "$input" | jq -r '.tool_input.command // ""')
+
+blocks=(
+  '(^|[[:space:]])--no-verify([[:space:]]|$)'
+  '(^|[[:space:]])--no-gpg-sign([[:space:]]|$)'
+  'git[[:space:]]+push[[:space:]]+([^&|;]*[[:space:]])?(-f|--force)([[:space:]]|$)'
+  'git[[:space:]]+reset[[:space:]]+[^&|;]*--hard'
+  'git[[:space:]]+clean[[:space:]]+-[a-zA-Z]*f'
+  'git[[:space:]]+checkout[[:space:]]+\.([[:space:]]|$)'
+  'git[[:space:]]+restore[[:space:]]+\.([[:space:]]|$)'
+  'git[[:space:]]+branch[[:space:]]+-D'
+  'git[[:space:]]+commit[[:space:]]+[^&|;]*--amend'
+  'rm[[:space:]]+-rf?[[:space:]]+/'
+  'rm[[:space:]]+-rf?[[:space:]]+~'
+  'rm[[:space:]]+-rf?[[:space:]]+\$HOME'
+)
+
+for pattern in "${blocks[@]}"; do
+  if [[ "$cmd" =~ $pattern ]]; then
+    cat >&2 <<EOF
+BLOCKED by .claude/hooks/bash-guard.sh
+
+This template forbids the agent from running this autonomously:
+  Pattern: ${pattern}
+  Command: ${cmd}
+
+If the user has explicitly authorized this action this turn, ask them to
+run it themselves (\`! <command>\` in the prompt) or document the override
+in their request. See CLAUDE.md → "Executing actions with care" and the
+Git Safety Protocol section.
+EOF
+    exit 2
+  fi
+done
+
+exit 0