Coding Harness

Reusable agent skills and workflows for everyday development.

Prerequisites

Before installing an agent, review the prerequisites for required CLI tools, terminal setup, and provider access.

Installation

Recommended terminal coding agents

• Claude Code - Anthropic’s terminal-native coding agent.
  • revdiff plugin - Interactive diff review and annotation workflow.
  • Codex plugin for Claude Code - Adds OpenAI Codex integration to Claude Code.
• Pi Coding Agent - Extensible terminal coding agent with packages, tools, skills, and TUI support.
  • revdiff package - Interactive code review and diff navigation.
  • pi-subagents package - Delegates work to focused subagents and chains.
  • pi-web-access package - Adds web search, content fetching, and library research tools.
  • pi-intercom package - Lets multiple Pi sessions communicate locally.
  • pi-review-loop package - Automates repeated code-review passes until issues are resolved.

Also worth trying

• Codex CLI with revdiff plugin or Codex app
• OpenCode
• GitHub Copilot CLI

Skills

To use coding-harness/skills in your projects, copy or symlink the skills folder to:

• For Claude Code:
  • project-folder/.claude/skills or ~/.claude/skills
• For Pi Coding Agent, OpenCode, Codex, Copilot:
  • project-folder/.agents/skills or ~/.agents/skills

Usage and workflow

Activate a skill with a slash command (for example, /brainstorm) or by using a trigger phrase from the skill metadata (for example, let's brainstorm).

Implement a user story

Activate the brainstorm skill:

/brainstorm """User story description"""

After brainstorming use the java-coder skill:

implement the plan YYYY-MM-DD-user-story-implementation-plan.md 
  using java coder skill and provide human verifiable proofs and/or artifacts

Code review

Activate the code-review skill:

code review uncommitted changes

Write tests

Activate the write-tests and test-coverage skills:

write tests for new and modified code

add test and branch coverage for UserController

Fix a bug

Activate the debug-error and/or clarify skills:

/debug-error """stack trace or errors in logs"""

clarify why the response status is 500 instead of 201

Refactoring

Activate the refactor-code and java-coder skills:

refactor code in the user login flow, following guidelines from the java-coder skill

Documenting

Use the pretty-mermaid skill to generate diagrams:

create a sequence diagram in SVG format with white background of the endpoint /api/v1/users

create a ASCII terminal-friendly sequence diagram of the endpoint /api/v1/users