What is harness?
harness is a Claude Code mod by Paradox07127 that skills and guard hooks: ai-code-cleanup, interrogate, shape-task, verify-change, setup, a shared-worktree git guard, and a guard against reading API-key config files. It is listed under Security and has no public popularity data yet.
| Type | Claude code mod |
|---|---|
| Author | Paradox07127 |
| Repository | Paradox07127/claude-utopia |
| Popularity | no public popularity data yet |
| Category | Security |
| Security | High risk (48/100) |
| Rank | #4,242 of 5,272 Claude Code mods; #443 in Security |
| License | MIT |
| Last commit | 2026-10-16 |
| Hooks | 14 events |
| Sees | classic hooks, every prompt, subagent spawns |
| Draws on | nothing |
Is harness safe to install?
harness scores 48/100 on the MCPMods security check: High risk. Things to review: starts processes outside the sandbox; writes files or config; reads environment variables; watches every prompt or event. It passed 3 of 8 checks.
Mod footprints come from claude plugin validate, which lists every event a mod hooks and every API call it makes without running it.
| Check | Result |
|---|---|
| No network access | Pass |
| Starts processes outside the sandbox | Review |
| Writes files or config | Review |
| Reads environment variables | Review |
| Watches every prompt or event | Review |
| Drives Claude (model calls, prompts) | Note |
| Passes claude plugin validate | Pass |
| Has an open-source license | Pass |
API calls in its code
| Call | What it means |
|---|---|
$.agent.list | |
$.clock.after | |
$.clock.now | |
$.command.register | |
$.command.run | drives Claude |
$.env.get | reads env vars |
$.fs.exists | reads files |
$.fs.list | reads files |
$.fs.read | reads files |
$.fs.stat | reads files |
$.fs.write | writes files |
$.model.complete | drives Claude |
$.process.run | runs processes |
$.session.compact | drives Claude |
$.session.cwd | |
$.session.id | |
$.session.messages | reads the transcript |
$.session.repo | |
$.session.root | |
$.session.usage | |
$.settings.read | reads settings |
$.state.get | |
$.state.set | |
$.store.delete | keeps its own state |
$.store.get | keeps its own state |
$.store.set | keeps its own state |
$.ui.log | draws interface |
$.ui.toast | draws interface |
How do I install harness?
- Check your Claude Code version. Mods need Claude Code 2.1.287 or later and are on by default.
claude --version
- Read its footprint. This lists every event it hooks and every API call it makes, without running it.
git clone https://github.com/Paradox07127/claude-utopia claude plugin validate ./claude-utopia/plugins/harness
- Install it. Run this in your terminal, then /reload-plugins in an open session.
claude plugin marketplace add Paradox07127/claude-utopia && claude plugin install harness@claude-utopia
Or ask Claude to set it up
Paste this into Claude Code and it installs harness for you:
Install the "harness" Claude Code mod from https://github.com/Paradox07127/claude-utopia/tree/main/plugins/harness. Run claude plugin validate on it first and show me what it can access before you enable it.
More from Paradox07127/claude-utopia
This repository has 5 Claude Code mods on MCPMods.
- dashboard: Unified workbench: a status band for subagents and mmrun reviews, plus a seven-page pane (Overview / Agents / Reviews / (Review before installing)
- mm: Cross-model review and delegation: /mm:review and /mm:run, built on mmrun (High risk)
- next-prompt: Next-prompt prediction: after each main-thread turn, a fork of the session's own model predicts your next message and sh (Review before installing)
- progress: A per-project progress board: after each typed turn that edited files or made a commit, the plugin records its work as n (High risk)