100 production-grade multi-agent harnesses for GitHub Copilot CLI
Adapted from revfactory/harness-100 for the Copilot CLI ecosystem

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harness-100-copilot is a port of revfactory/harness-100 for GitHub Copilot CLI.

The original harness-100 provides 100 production-grade multi-agent team harnesses for Claude Code, where agents communicate via SendMessage. This project adapts the available Phase 2 harnesses (15 of 100 planned) to work with Copilot CLI's file-based message bus pattern, achieving ~96% functional parity.

What's a harness? A pre-assembled team of 4-7 specialist agents that collaborate through a structured pipeline to complete complex tasks — like building a full-stack web app, reviewing a PR, or setting up a CI/CD pipeline.

# 1. Clone this repository
git clone https://github.com/drvoss/harness-100-copilot.git

# 2. Copy a harness to your project (example: code-reviewer)
cp -r harness-100-copilot/harnesses/21-code-reviewer/agents/ .github/agents/
cp -r harness-100-copilot/harnesses/21-code-reviewer/skills/ .github/skills/
cp -r harness-100-copilot/references/ references/   # required by security, testing, and performance harnesses

# 3. Start Copilot CLI in your project
cd your-project
copilot

# 4. Trigger a harness
> Review my recent changes for security and architecture issues

📖 See guides/installation.md for detailed setup instructions.

The original harness-100 uses Claude Code's SendMessage for real-time cross-agent communication:

style-inspector → SendMessage(synthesizer, findings)
security-analyst → SendMessage(synthesizer, findings)

GitHub Copilot CLI doesn't have this primitive. We replace it with a file-based message bus:

_workspace/
  messages/
    style-inspector-to-review-synthesizer.md
    security-analyst-to-review-synthesizer.md
    performance-analyst-to-review-synthesizer.md
  01_style_review.md
  02_security_review.md
  ...

Each agent writes its output and a structured message summary to _workspace/messages/. The next agent reads the relevant messages before starting. This achieves ~90% of the communication richness with zero extra infrastructure.

📖 See guides/message-bus-pattern.md and PORTING-NOTES.md for the full explanation.

Each harness is self-contained in harnesses/{nn}-{name}/:

{nn}-{harness-name}/
├── HARNESS.md          # Overview, agent list, usage, installation
├── agents/
│   ├── specialist-1.md
│   ├── specialist-2.md
│   └── ...
└── skills/
    ├── orchestrator/SKILL.md    # Layer 1: team coordination
    ├── domain-skill-1/SKILL.md  # Layer 2: domain expertise
    └── domain-skill-2/SKILL.md  # Layer 2: domain expertise

To install a harness into your project:

# Copy agents and skills to your project's .github directory
cp -r harnesses/21-code-reviewer/agents/ your-project/.github/agents/
cp -r harnesses/21-code-reviewer/skills/ your-project/.github/skills/

Then trigger the orchestrator skill with a natural language request in Copilot CLI.

📖 See guides/installation.md for detailed instructions.

Building a new harness? Use the provided templates:

• templates/agent-template.md — Agent definition template
• templates/orchestrator-skill-template.md — Orchestrator SKILL.md template
• templates/workspace-layout.md — _workspace/ layout conventions

For individual skills, orchestration patterns, and guides — not full harnesses: → drvoss/everything-copilot-cli

everything-copilot-cli    ←→    harness-100-copilot
  Pattern guides                  Full harness teams
  Individual skills (~40)         Team harnesses (100)
  Orchestration examples          Production pipelines

1. Port a harness — Pick an unimplemented harness and follow PORTING-NOTES.md
2. Improve existing harnesses — Fix bugs, improve agent prompts, add test scenarios
3. Add domain skills — Extend harnesses with new domain-specific skills
4. Test and validate — Run npm test to validate harness structure

npm install
npm test        # Validate all harness structures
npm run lint:md # Lint markdown

Apache 2.0 — See LICENSE and ATTRIBUTION.md

Adapted from revfactory/harness-100 (Apache 2.0).

_{Built for the GitHub Copilot CLI community · Adapted from revfactory/harness-100}