Initial commit

pi-extension/subagents/plugin/.claude-plugin/plugin.json

@@ -0,0 +1,5 @@
+{
+  "name": "pi-auto-exit",
+  "version": "1.0.0",
+  "description": "Auto-exit plugin for pi-spawned Claude sessions"
+}

pi-extension/subagents/plugin/hooks/hooks.json

@@ -0,0 +1,15 @@
+{
+  "hooks": {
+    "Stop": [
+      {
+        "hooks": [
+          {
+            "type": "command",
+            "command": "${CLAUDE_PLUGIN_ROOT}/hooks/on-stop.sh",
+            "timeout": 10
+          }
+        ]
+      }
+    ]
+  }
+}

pi-extension/subagents/plugin/hooks/on-stop.sh

@@ -0,0 +1,68 @@
+#!/usr/bin/env bash
+# Stop hook for pi-spawned Claude sessions.
+# Writes a sentinel file when Claude completes autonomously (no user interjection).
+
+set -euo pipefail
+
+# Read JSON input from stdin
+input=$(cat)
+
+# Guard: if stop_hook_active is true, we're in a loop — bail out
+stop_hook_active=$(echo "$input" | python3 -c "import sys,json; d=json.load(sys.stdin); print(d.get('stop_hook_active', False))" 2>/dev/null || echo "False")
+if [ "$stop_hook_active" = "True" ]; then
+  exit 0
+fi
+
+# Guard: only act for pi-spawned sessions
+if [ -z "${PI_CLAUDE_SENTINEL:-}" ]; then
+  exit 0
+fi
+
+# Get transcript path
+transcript_path=$(echo "$input" | python3 -c "import sys,json; d=json.load(sys.stdin); print(d.get('transcript_path', ''))" 2>/dev/null || echo "")
+if [ -z "$transcript_path" ] || [ ! -f "$transcript_path" ]; then
+  exit 0
+fi
+
+# Count real human messages in transcript (not tool results)
+# Claude's transcript format:
+#   Human message: {"type": "user", "message": {"role": "user", "content": "..."}}
+#   Tool result:   {"type": "user", "message": {"role": "user", "content": [{"type": "tool_result", ...}]}}
+# We only count entries where content is a string (real human input)
+user_msg_count=$(python3 - "$transcript_path" <<'EOF'
+import sys, json
+
+transcript_path = sys.argv[1]
+count = 0
+with open(transcript_path, 'r') as f:
+    for line in f:
+        line = line.strip()
+        if not line:
+            continue
+        try:
+            entry = json.loads(line)
+            if entry.get('type') != 'user':
+                continue
+            content = entry.get('message', {}).get('content', '')
+            # Real human messages have string content
+            # Tool results have array content with tool_result blocks
+            if isinstance(content, str):
+                count += 1
+        except (json.JSONDecodeError, AttributeError):
+            pass
+print(count)
+EOF
+)
+
+# Always write transcript path so the watcher can copy the session file
+if [ -n "$transcript_path" ]; then
+  echo "$transcript_path" > "${PI_CLAUDE_SENTINEL}.transcript" 2>/dev/null || true
+fi
+
+# If exactly 1 user message (the initial prompt), this was autonomous — signal completion
+if [ "$user_msg_count" -eq 1 ]; then
+  # Write last_assistant_message to sentinel so the watcher gets a clean result
+  echo "$input" | python3 -c "import sys,json; d=json.load(sys.stdin); print(d.get('last_assistant_message', ''))" > "$PI_CLAUDE_SENTINEL" 2>/dev/null || touch "$PI_CLAUDE_SENTINEL"
+fi
+
+exit 0