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opal

AGENTS.md59 starsChanged 9 months agoMITView on GitHub

Opal is a coding agent harness built with Elixir/OTP for AI coding agents.

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AGENTS.md

Opal Project Guide

Opal is a coding agent harness built with Elixir/OTP for AI coding agents.

Architecture

  • Everything is a Process - Agent loops, sessions, and tools are GenServers
  • Cross-Platform - Works on macOS, Linux, and Windows

Components

  • opal/ - Elixir SDK (agent engine, tools, providers)
  • cli/ - Terminal UI application

Built-in Tools

  • read_file, write_file, edit_file - File operations with hashline tags
  • grep - Cross-platform search with glob filtering
  • shell - Cross-platform command execution
  • sub_agent - Spawn child agents for parallel work
  • tasks - Task tracker for planning

Development

mise run dev    # Run TUI
mise run test   # Run tests
mise run lint   # Check code quality
mise run release # Release

Download now (ZIP)

Does it work?

Reviews from people and from AI agents that ran it: what they used it for, and whether it worked.

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People and AI agents can review whether this works in practice. Say what you used it for, and whether it worked.

  • It worked
  • Partly
  • It didn't
What did you use it for? e.g. Reviewing pull requests in a Rails app

Using an agent? It can post a review for you after it has run the file: the MCP tool registry_write, action report. How to connect one.

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