WorkflowCwdChanged

Reload direnv on directory change

Automatically reloads environment variables via direnv when Claude changes its working directory, ensuring Bash commands use the right environment for the current directory.

Use cases

Mono-repo projects with different environments per subfolder
Automatic .envrc management with direnv
Sync CLAUDE_ENV_FILE with the current directory's environment

Providers & tags

Claude Code

#direnv#environment#cwd#monorepo

settings.json fragment

{
  "hooks": {
    "CwdChanged": [
      {
        "hooks": [
          {
            "command": "node $CLAUDE_PROJECT_DIR/.claude/hooks/reload-direnv.mjs",
            "type": "command"
          }
        ],
        "matcher": ""
      }
    ],
    "SessionStart": [
      {
        "hooks": [
          {
            "command": "node $CLAUDE_PROJECT_DIR/.claude/hooks/reload-direnv.mjs",
            "type": "command"
          }
        ],
        "matcher": ""
      }
    ]
  }
}

Script · .claude/hooks/reload-direnv.mjs

#!/usr/bin/env node
// Recharge direnv quand le répertoire de travail change (CwdChanged)
import { readFileSync, existsSync } from 'fs';
import { execSync } from 'child_process';
import { fileURLToPath } from 'url';

function defaultExec(cmd, cwd) {
  execSync(cmd, { cwd, stdio: 'ignore', timeout: 5_000 });
}

export function run(input, { exec = defaultExec, exists = existsSync } = {}) {
  const newCwd = input.cwd ?? input.new_cwd ?? process.cwd();
  const envrc = `${newCwd}/.envrc`;
  if (!exists(envrc)) return null;

  try {
    exec('direnv allow .', newCwd);
    return { message: `[reload-direnv] direnv rechargé dans ${newCwd}\n` };
  } catch {
    // direnv absent — non bloquant
    return null;
  }
}

/* v8 ignore next 5 */
if (process.argv[1] === fileURLToPath(import.meta.url)) {
  const input = JSON.parse(readFileSync(0, 'utf8'));
  const result = run(input);
  if (result?.message) process.stderr.write(result.message);
}