# Hack v4.2.4

Source revision: 91b14bf0abb17602142425de0d02628a3e8a2615

- [Core concepts](https://hack.foo/docs/v4/core)
- [Project setup](https://hack.foo/docs/v4/guides/init-project)
- [Environment and secrets](https://hack.foo/docs/v4/env)
- [Lifecycle](https://hack.foo/docs/v4/lifecycle)
- [Sessions](https://hack.foo/docs/v4/sessions)
- [Worktrees and watchers](https://hack.foo/docs/v4/guides/development-runtime-safety)
- [Agent setup](https://hack.foo/docs/v4/guides/agent-first-setup)
- [Agent integrations](https://hack.foo/docs/v4/integrations)
- [CLI overview](https://hack.foo/docs/v4/cli)
- [Command reference](https://hack.foo/docs/v4/reference/cli)
- [Architecture](https://hack.foo/docs/v4/architecture)
- [Reference index](https://hack.foo/docs/v4/reference)
- [Documentation](https://hack.foo/docs/v4)
- [Install](https://hack.foo/docs/v4/install)
- [Getting started](https://hack.foo/docs/v4/getting-started)
- [Agent handoff](https://hack.foo/docs/v4/agent-handoff)
- [Run and inspect](https://hack.foo/docs/v4/guides/run-project)
- [Choose command context](https://hack.foo/docs/v4/guides/run-commands)
- [Parallel work](https://hack.foo/docs/v4/guides/parallel-work)
- [Share environment and secrets](https://hack.foo/docs/v4/guides/share-environment)
- [Project helpers](https://hack.foo/docs/v4/guides/project-helpers)
- [Cloud and remote environments](https://hack.foo/docs/v4/guides/cloud-environments)
- [Managed environments](https://hack.foo/docs/v4/guides/codex-managed-environments)
- [Reference and contracts](https://hack.foo/docs/v4/reference/overview)
- [Configuration fields](https://hack.foo/docs/v4/reference/configuration-fields)
- [MCP fields and results](https://hack.foo/docs/v4/reference/mcp-fields)
- [Command and output contracts](https://hack.foo/docs/v4/reference/command-contracts)
- [Project and env reports](https://hack.foo/docs/v4/reference/project-env-reports)
- [Diagnostic and setup reports](https://hack.foo/docs/v4/reference/diagnostic-reports)