What is harness-ops?
harness-ops is a Claude Code mod by melodic-software that claude Code operations: audit-skill-visibility (skills the listing budget hides), inventory (every invocable surface), audit-install-state, audit-performance (slowness), audit-mod-posture. It is listed under Security and has 26 GitHub stars.
| Type | Claude code mod |
|---|---|
| Author | melodic-software |
| Repository | melodic-software/claude-code-plugins |
| Popularity | 26 GitHub stars |
| Category | Security |
| Security | Review before installing (76/100) |
| Rank | #271 of 5,272 Claude Code mods; #48 in Security |
| License | MIT |
| Last commit | 2026-10-18 |
| Stars this week | +3 |
| Hooks | 28 events |
| Sees | classic hooks |
| Draws on | nothing |
Is harness-ops safe to install?
harness-ops scores 76/100 on the MCPMods security check: Review before installing. Things to review: starts processes outside the sandbox; reads environment variables. It passed 6 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 no files or config | Pass |
| Reads environment variables | Review |
| Only sees the events it hooks | Pass |
| Doesn't drive Claude | Pass |
| Passes claude plugin validate | Pass |
| Has an open-source license | Pass |
API calls in its code
| Call | What it means |
|---|---|
$.clock.after | |
$.env.get | reads env vars |
$.process.run | runs processes |
$.session.root | |
$.ui.log | draws interface |
How do I install harness-ops?
- 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/melodic-software/claude-code-plugins claude plugin validate ./claude-code-plugins/plugins/harness-ops
- Install it. Run this in your terminal, then /reload-plugins in an open session.
claude plugin marketplace add melodic-software/claude-code-plugins && claude plugin install harness-ops@melodic-software
Or ask Claude to set it up
Paste this into Claude Code and it installs harness-ops for you:
Install the "harness-ops" Claude Code mod from https://github.com/melodic-software/claude-code-plugins/tree/main/plugins/harness-ops. Run claude plugin validate on it first and show me what it can access before you enable it.
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