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act101

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tree-based navigation, semantic refactoring, codebase analysis, and language porting tools for coding agents supporting 163 grammars

About act101

act101 is a developer tool designed to help AI coding agents refactor and port code across a wide range of programming languages. It provides a native binary interface that supports 163 grammars, over 180 refactor operations, and multiple analyzers for codebase analysis. The tool integrates with agents such as Claude Code, Cursor, Codex, and OpenCode, enabling automated structural changes, cross-language porting, and verification of code modifications. act101 offers a free Builder Edition for personal and open-source projects, while commercial and advanced features are available through paid tiers. Its focus is on maintaining code quality and traceability in environments where AI agents make frequent changes.

Best for: AI coding agent users, software engineers managing large codebases, open-source maintainers, teams modernizing legacy code

Key features

  • Supports automated refactoring and porting for 163 programming languages
  • Provides over 180 AST-aware refactor operations for code modification
  • Includes analyzers for codebase structure, dead code, and coupling hotspots
  • Integrates with AI coding agents like Claude Code, Cursor, Codex, and OpenCode
  • Offers deterministic merge gating and instant undo for agent-made changes
  • Enables cross-language code porting with verification of functional parity
  • Native binary with CLI and MCP server interfaces for agent connectivity
  • Free Builder Edition for non-commercial and open-source use

Use cases

  • Automating code refactoring tasks in large or multi-language codebases
  • Porting code from one language to another, such as C to Rust or Ruby to Elixir
  • Verifying and attesting code changes made by AI agents before merging
  • Analyzing codebases for structural issues and technical debt
  • Undoing or rolling back problematic agent-generated code changes
  • Integrating with popular AI coding agents for automated code maintenance

Pros

  • Free tier available for personal, non-commercial, and open-source use
  • Supports a wide range of programming languages and grammars
  • Native binary with no external dependencies or supply chain risk
  • Integrates with multiple AI coding agents and editors

Limitations

  • Full mutation toolkit and advanced features require a paid plan
  • Builder Edition limited to 138 of 163 grammars and fewer analyzers
  • Not intended for users who only need simple code completion

Screenshots

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