Scaffold your own focused AI agent harness — pick host (Claude Code, Codex, pi.dev, Hermes), template, agents, skills, and ship a npm-publishable harness with its own npx CLI.
SkillScore95Maintained
Automatic
◆AI Engineer pack
Last verified 8/17/2026
What it changes
Passed 20 of 21 test cases with the skill, and 4 of 21 without it.
Without skill18%
With skill95%
Checks it passed that the model alone missed
Executes a post-generation smoke test
Includes SYSTEM.md in the generated file list
Names witness.json as the provenance manifest
and 17 more in the full report
17 fixed4 passed either way1 still failing0 broke
Pass-rate lift
+77 pp
Tokens
-31%
Agent turns
0%
Response time
-67%
Model gemini-3.6-flashMeasured 8/17/2026v121 of 22 cases passed with skill · 21 comparable
Tokens, turns and time describe resource use, not a dollar price.
See it in action
One of 16 test cases the skill fixed. Same model, same prompt, with and without the skill.
1 of 16
Prompt
Which runtime configuration file is written to the project root when scaffolding for Hermes agent execution?
What was checked, without and with the skill
Checked
Without skill
With skill
Names cli-config.yaml as the Hermes runtime configuration file
Missed
Passed
case-11 · gemini-3.6-flash · 8/17/2026 · answers are capped and redacted
What's inside
The instructions your model reads when the skill loads.
SKILL.md65 linessingle file
create-harness
This skill scaffolds an AI agent harness — your own focused, branded harness with its own npx <name> CLI, MCP server registration, memory namespace, learning loop, and marketplace identity.
When to use this skill
Use this skill when the user wants any of:
A custom MCP-server-backed AI assistant (legal, trading, support, ops, …)
A Claude Code plugin that bundles their own agents/skills/prompts
A Codex skill that wraps a kernel + tools
A pi.dev extension or Hermes agent runtime config
A standalone npm package they can npm publish under their own scope
How to invoke
/create-harness
The skill asks for:
Harness name (kebab-case, e.g. legal-redline)
Description (one line)
Host(s) — Claude Code, Codex, pi.dev, Hermes (multi-select)
Routing strategy — 3-tier (default) or single-tier
Marketplace — independent (no ruflo branding) or powered-by
Under the hood
Calls npx create-agent-harness <name> with the user's choices, copies the chosen template into the current directory, runs the post-generation smoke test, and emits a .harness/manifest.json so future updates can harness upgrade cleanly (copier-style regenerate-diff-merge).