act101

act101 is a code transformation and verification tool that lets AI agents refactor and port code across 163 languages using AST-aware operations, with a deterministic gate that classifies each change before merge.

What is act101?

act101 is a native Rust binary that gives AI agents real refactoring and porting capabilities via MCP and CLI. It takes source code edits proposed by agents and runs them through a three-stage pipeline — Analyze, Act, Attest — producing a deterministic MERGE / REVIEW / BLOCK verdict along with a signed receipt and one-command rollback. The tool runs locally with zero dependencies, no data exfiltration, and integrates with Claude Code, Cursor, Codex, Windsurf, Zed, and opencode. It was built by an engineer with decades of experience in correctness-critical software (financial services, medical devices, biotech).

Key Features

• Analyze stage — 41 analyzers detect dead code, cycles, coupling, hotspots, and seams before any transformation.
• Act stage — 183 refactor operations (rename, extract, inline, move, modernize) plus 8 porting operations across 163 grammars.
• Attest stage — Six verify ops plus a deterministic gate that classifies the change, finds reaching tests, diffs side effects, and returns a verdict with a signed receipt and one-command rollback.
• MCP and CLI — Built-in Model Context Protocol server and standalone CLI; one-command install for Claude Code, Cursor, Codex, Windsurf, Zed, and opencode.
• Token efficiency — ~85% leaner on tokens by answering in one call instead of reading whole files (methodology).
• Zero dependencies — Single native binary, no runtime dependencies, no supply chain risk.

Who is it for?

• Individual engineers — Verify every refactor your agent makes before it merges, with a deterministic gate.
• Codebase owners / architects — See structural drift, prove refactoring correctness on every commit (details).
• Vibe coders — Non-technical users who want AI to code better without understanding internals; plain-English version available (Show me the plain version).

What can you do with act101?

• Refactor existing code — Extract variables, inline functions, rename symbols across cross-file projects with guaranteed behavior preservation.
• Port between languages — Use 8 porting operations to move code from one of 163 languages to another (e.g., C to Rust, Ruby to Elixir).
• Verify AI-generated changes — Run act gate on every agent edit to get a MERGE/REVIEW/BLOCK verdict before committing.

How does act101 work?

The tool operates in three stages. Analyze: 41 analyzers map the codebase (dead code, cycles, coupling, hotspots, seams). Act: 183 refactor operations transform code (rename, extract, inline, move, modernize). Attest: 6 verify ops plus the act gate classify the change, find reaching tests, diff side effects, and return a deterministic verdict with a signed receipt. The agent then merges, reviews, or rolls back with one command.

Pricing

Freemium with four tiers. Builder Edition: $0 free forever (personal, non-commercial, open-source). Engineering Edition: $29/month (commercial license, full mutation toolkit). Architecture Edition: $59/month (structural analysis, whole-codebase taint). Elite Edition: $99/month (adds 25 premium languages: COBOL, Fortran, Ada, Solidity, CUDA). All prices USD, 7-day free trial.

FAQ

Is act101 free?

Yes, the Builder Edition is free forever for personal, non-commercial, and open-source projects. Commercial use requires a paid subscription starting at $29/month.

How does act101 integrate with my AI agent?

It registers as an MCP server or CLI plugin with Claude Code, Cursor, Codex, Windsurf, Zed, and opencode. Installation is one command per tool (e.g., act install cursor).