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harness
82 / 100 · Low risk
Fine to try. Some of what it can do is expected: a coding skill usually runs build and test commands.
By griddynamics/rosetta (GitHub) · coding · 375 stars · scanned at commit ca35acf
To build an AI harness: run, observe, validate, automate repeated work faster — CLI/MCP actions, devcontainers, skills, subagents, hooks, pipelines, automations.
Works with any agent that supports SKILL.md skills.
What this skill can do
Runs commands on your computer
This is disclosed by the author in the skill's SKILL.md or README. Expected for a coding skill.
Found in 66 places.
Show 17 more
- instructions/r3/core/skills/harness/references/hooks/antigravity/hooks.json, line 13
"command": "node ${CLAUDE_PLUGIN_DIR}/skills/harness/scripts/tester.js --emit-once '{\"injectSteps\":[{\"userMessage\":\"Diagnostic marker AG-POSTINV-USERMSG-g4 - instructions/r3/core/skills/harness/references/hooks/antigravity/hooks.json, line 20
"command": "node ${CLAUDE_PLUGIN_DIR}/skills/harness/scripts/tester.js --mode antigravity --block-stop-once --tag Stop", - instructions/r3/core/skills/harness/references/hooks/antigravity/hooks.json, line 30
"command": "node ${CLAUDE_PLUGIN_DIR}/skills/harness/scripts/tester.js --mode antigravity --output '{\"decision\":\"allow\",\"reason\":\"Diagnostic marker AG-PR - instructions/r3/core/skills/harness/references/hooks/antigravity/hooks.json, line 42
"command": "node ${CLAUDE_PLUGIN_DIR}/skills/harness/scripts/tester.js --tag PostToolUse", - instructions/r3/core/skills/harness/references/hooks/claude/hooks.json, line 9
"command": "node \"${CLAUDE_PLUGIN_DIR}/skills/harness/scripts/tester.js\" --tag SessionStart-clean --output '{\"hookSpecificOutput\":{\"hookEventName\":\"Sessi - instructions/r3/core/skills/harness/references/hooks/claude/hooks.json, line 19
"command": "node \"${CLAUDE_PLUGIN_DIR}/skills/harness/scripts/tester.js\" --tag SessionStart-strict --output '{\"hookSpecificOutput\":{\"hookEventName\":\"Sess - instructions/r3/core/skills/harness/references/hooks/claude/hooks.json, line 31
"command": "node \"${CLAUDE_PLUGIN_DIR}/skills/harness/scripts/tester.js\" --tag PreToolUse --mode claude --deny-on-match HOOK-DENY-PROBE --rewrite-command 'REW - instructions/r3/core/skills/harness/references/hooks/claude/hooks.json, line 43
"command": "node \"${CLAUDE_PLUGIN_DIR}/skills/harness/scripts/tester.js\" --tag PostToolUse --output '{\"hookSpecificOutput\":{\"hookEventName\":\"PostToolUse\ - instructions/r3/core/skills/harness/references/hooks/claude/hooks.json, line 55
"command": "node \"${CLAUDE_PLUGIN_DIR}/skills/harness/scripts/tester.js\" --tag SubagentStop", - instructions/r3/core/skills/harness/references/hooks/claude/hooks.json, line 67
"command": "node \"${CLAUDE_PLUGIN_DIR}/skills/harness/scripts/tester.js\" --tag Stop --mode claude --block-stop-once", - instructions/r3/core/skills/harness/references/hooks/claude/hooks.json, line 79
"command": "node \"${CLAUDE_PLUGIN_DIR}/skills/harness/scripts/tester.js\" --tag PreCompact", - instructions/r3/core/skills/harness/references/hooks/claude/hooks.json, line 91
"command": "node \"${CLAUDE_PLUGIN_DIR}/skills/harness/scripts/tester.js\" --tag PostCompact", - instructions/r3/core/skills/harness/references/hooks/codex/hooks.json, line 9
"command": "node ${CLAUDE_PLUGIN_DIR}/skills/harness/scripts/tester.js --output '{\"hookSpecificOutput\":{\"hookEventName\":\"SessionStart\",\"additionalContext - instructions/r3/core/skills/harness/references/hooks/codex/hooks.json, line 22
"command": "node ${CLAUDE_PLUGIN_DIR}/skills/harness/scripts/tester.js --output '{\"hookSpecificOutput\":{\"hookEventName\":\"SubagentStart\",\"additionalContex - instructions/r3/core/skills/harness/references/hooks/codex/hooks.json, line 35
"command": "node ${CLAUDE_PLUGIN_DIR}/skills/harness/scripts/tester.js --tag PreToolUse --deny-on-match HOOK-DENY-PROBE --rewrite-command 'REWRITE_ME_PRETOOLUSE - instructions/r3/core/skills/harness/references/hooks/codex/hooks.json, line 48
"command": "node ${CLAUDE_PLUGIN_DIR}/skills/harness/scripts/tester.js --tag PermissionRequest", - instructions/r3/core/skills/harness/references/hooks/codex/hooks.json, line 61
"command": "node ${CLAUDE_PLUGIN_DIR}/skills/harness/scripts/tester.js --output '{\"systemMessage\":\"PostToolUse systemMessage marker CODEX-PTU-SYSMSG.\",\"hoo
and 46 more places
Downloads and installs other software
The author does not mention this.
Found in 1 place.
Other copies in this repository
griddynamics/rosetta has 13 more folders with a skill named harness. This page shows the lowest-scoring copy.
Install
Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.
if [ -e ~/.agents/skills/'harness' ] || [ -L ~/.agents/skills/'harness' ]; then echo 'A skill folder named harness already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/griddynamics/rosetta' "$d" && git -C "$d" checkout --quiet 'ca35acfc2dd5f0bd25e8ab5f7fd3c7acf4e0ff7b' -- 'instructions/r3/core/skills/harness' && mkdir -p ~/.agents/skills && cp -R "$d"/'instructions/r3/core/skills/harness' ~/.agents/skills/'harness' && rm -rf "$d"; fi
Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'harness' ~/.claude/skills/'harness' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.
Badge for your README
The badge for griddynamics/rosetta shows the score of its lowest-scoring skill.
[](https://zalavijaysinh.github.io/skilltrust/repos/griddynamics/rosetta/)
Score history
| Date | Version | Score |
|---|
| 2026-11-12 | ca35acf | 82 |
| 2026-11-08 | 7a74876 | 100 |
| 2026-11-06 | 7a74876 | 82 |