Create Agent

Create & Configure Agents

Quick Start

1. Create directory structure: mkdir -p my-agent/skills
2. Write agent.yaml with required fields (see below)
3. Create SOUL.md with agent identity
4. Add skills, tools, and knowledge as needed
5. Validate: opengap validate -d ./my-agent

agent.yaml Reference

Required Fields

spec_version: "0.1.0"
name: my-agent          # Unique identifier
version: 1.0.0          # Semantic version
description: What this agent does

Model Configuration

model:
  preferred: claude-sonnet-4-5-20250929
  fallback:
    - claude-haiku-4-5-20251001
  constraints:
    temperature: 0.2     # 0.0 - 1.0
    max_tokens: 4096
    top_p: 0.9

Skills & Tools

skills:
  - code-review          # Must match directory name in skills/
  - security-audit

tools:
  - lint-check           # Must match filename in tools/ (without .yaml)

Runtime

runtime:
  max_turns: 20          # Max conversation turns
  timeout: 120           # Seconds

Sub-Agents

agents:
  reviewer:
    description: Reviews code quality
    delegation:
      mode: auto
      triggers:
        - "review this"

Writing a Good SOUL.md

A SOUL.md should have these sections:

• Core Identity — Who is this agent? One clear sentence.
• Communication Style — How does it talk? (direct, friendly, formal, etc.)
• Values & Principles — What does it prioritize?
• Domain Expertise — What does it know?
• Collaboration Style — How does it work with the user?

Writing RULES.md

Structure as:

• Must Always — Non-negotiable behaviors
• Must Never — Hard boundaries
• Output Constraints — Formatting rules
• Interaction Boundaries — Scope limits

Adding Skills

Create skills//SKILL.md:

---
name: my-skill
description: What this skill does
license: MIT
allowed-tools: Read Edit Grep
metadata:
  version: "1.0.0"
---

# Instructions
[Detailed instructions for using this skill]

Adding Tools

Create tools/.yaml:

name: my-tool
description: What this tool does
input_schema:
  type: object
  properties:
    query:
      type: string
      description: Search query
  required:
    - query

Adding Knowledge

Create knowledge/index.yaml:

documents:
  - path: reference.md
    always_load: true    # Include in system prompt
  - path: appendix.md
    always_load: false   # Available on demand

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: open-gitagent
• Source: open-gitagent/opengap
• License: MIT
• Homepage: https://gitagent.sh

Install and usage instructions live in the source repository linked above.