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Claude Code Harness
Claude Code Harness is a development plugin for Claude Code, Codex CLI, Cursor, and Grok that manages a plan, work, and review loop.
Claude Code Harness is a development plugin for delegating planning, implementation, validation, and review tasks to agents like Claude Code or Codex. You provide the intended outcome and completion criteria, and assigned agents inspect existing code, organize work, and execute tasks within authorized scopes. The system uses five verb skills—plan, work, review, sync, and release—to guide development through specific gates and ensure changes match criteria. A Go safety engine inspects operations before execution using runtime floors and guardrails to prevent unauthorized actions. Non-engineers can use single-screen HTML views to judge progress and acceptance without reading code.
Claude Code Harness at a glance
Key features
- Generates spec.md and Plans.md from intent
- Executes solo or team implementation by task count
- Reviews implementation results separately
- Compares plans against actual code to report drift
- Packages verified evidence into changelogs and releases
- Inspected operations via Go safety engine and guardrails
- Displays live sessions across worktrees in a roster
Use it for
- Delegating development planning and implementation
- Running test-driven development tasks
- Reviewing code changes separately from implementation
- Tracking project progress with HTML views
- Packaging verified evidence into releases
Companions
Tools that articles about Claude Code Harness recommend using with it, each with its job.
- Claude Code — Built to work with Claude Code.
- Cursor — Built to work with Cursor.
- Grok — Built to work with Grok.
- Context7 — Provides up-to-date documentation for AI agents and code editors.
- Playwright MCP — Enables LLMs to interact with web pages using structured accessibility snapshots.
- GitHub MCP Server — Reads pull requests, issues and code search on GitHub.
Alternatives to Claude Code Harness
- Codex Plugin for Claude Code — Delegate tasks and run code reviews with Codex directly inside Claude Code.
- Harness Meta-Skill — Generates specialized agent teams and skills for Claude Code from a single prompt.
- Claude Code mods — Add live lines above the prompt, command guards, panes, and games to Claude Code.
- HarnessRouter — One API to manage agent runtimes, sandboxes, and execution lifecycles.
- Better Harness — Gathers project evidence and turns concrete gaps into prioritized findings.
- CLI Dispatch — Runs alternative AI models as workers from inside Claude Code.
- Claude Code Workflows — Provides pre-built, automated workflows for Claude Code development processes.
- Ralph for Claude Code — Enables continuous coding cycles with built-in API safeguards and rate limiting.
- Durable Harness — Recovers sessions from logs after crashes and prevents duplicate tool calls.
- Claude Skills Pack — 388 production-ready skills across 13 tools with zero-dependency Python tools.
- Claude HUD — Shows real-time context usage, rate limits, and agent activity inside your terminal.
- My Claude Code Mods — Adds detailed session profiling, timeline snapshots, and loop detection to Claude Code.
All Claude Code Harness alternatives