#!/usr/bin/env python3
"""
Daem0n Post-Edit Hook - Suggest remembering significant changes
This hook runs AFTER Edit/Write tools complete.
It analyzes the change and suggests calling remember() for significant modifications.
Output: Suggestion text (added to Claude's context)
Exit code 0: Success
"""
import json
import os
import sys
from pathlib import Path
PROJECT_DIR = os.environ.get("CLAUDE_PROJECT_DIR", "")
TOOL_INPUT = os.environ.get("TOOL_INPUT", "{}")
TOOL_OUTPUT = os.environ.get("TOOL_OUTPUT", "")
# Patterns indicating significant changes
SIGNIFICANT_PATTERNS = [
# Architecture changes
"class ", "def __init__", "async def ", "@dataclass", "@mcp.tool",
# Configuration
"config", "settings", "environment", "env",
# Security
"auth", "password", "token", "secret", "credential",
# Database
"migration", "schema", "model", "table", "column",
# API
"endpoint", "route", "api", "request", "response",
]
# File types that are usually significant
SIGNIFICANT_EXTENSIONS = [
".py", ".ts", ".js", ".go", ".rs", ".java",
".yaml", ".yml", ".json", ".toml",
".sql", ".prisma",
]
def get_tool_info() -> tuple[str | None, str | None]:
"""Extract file_path and change info from tool input/output."""
try:
input_data = json.loads(TOOL_INPUT)
file_path = input_data.get("file_path")
old_string = input_data.get("old_string", "")
new_string = input_data.get("new_string", "")
return file_path, f"{old_string} -> {new_string}"
except (json.JSONDecodeError, TypeError):
return None, None
def has_daem0n_setup() -> bool:
"""Check if Daem0n is set up."""
if not PROJECT_DIR:
return False
return (Path(PROJECT_DIR) / ".daem0nmcp").exists()
def is_significant_change(file_path: str, change_content: str) -> bool:
"""Determine if this change is significant enough to remember."""
if not file_path:
return False
# Check file extension
ext = Path(file_path).suffix.lower()
if ext not in SIGNIFICANT_EXTENSIONS:
return False
# Check for significant patterns in the change
change_lower = change_content.lower()
for pattern in SIGNIFICANT_PATTERNS:
if pattern.lower() in change_lower:
return True
# Check change size (large changes are often significant)
if len(change_content) > 500:
return True
return False
def main():
"""Main hook logic."""
if not has_daem0n_setup():
sys.exit(0)
file_path, change_content = get_tool_info()
if not file_path or not change_content:
sys.exit(0)
# Only suggest for significant changes
if not is_significant_change(file_path, change_content):
sys.exit(0)
# Output suggestion
filename = Path(file_path).name
print(
f"[Daem0n suggests] Significant change to {filename}. "
f"Consider: remember(category='decision', content='...', file_path='{file_path}')"
)
sys.exit(0)
if __name__ == "__main__":
main()
