act101

act

AST-aware code transformer for AI coding agents. 65+ MCP tools for code analysis and refactoring across 190+ languages and representational grammars — typically 80–99% fewer tokens than reading source files with built-in tools.

This repository is the public distribution point for act: plugin files for the Claude Code marketplace and pre-built binaries for every supported platform. Source code lives in a separate, gated repository.

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Install

All install paths produce a single statically-linked (or dependency-free) executable. The recommended path is the shell installer — it handles binary download, Terms of Service, and optionally wires the Claude Code plugin in one step.

1. Shell installer (Linux, macOS) — recommended

curl -sSL https://raw.githubusercontent.com/act101-ai/act101/main/install.sh | sh

The installer downloads the matching binary for your platform, verifies it against SHA256SUMS.txt, places it on your PATH, walks the Terms of Service, and offers to register it with Claude Code.

Non-interactive flags (pass after sh -s --):

• --accept-terms-of-service=yes — accept TOS non-interactively.
• --install-claude-plugin=<yes|no|ask> — control Claude Code plugin registration. Default is ask in interactive shells, no otherwise.
• --prefix=<dir> — install prefix (defaults to /usr/local/bin as root, ~/.local/bin otherwise).
• --version=v0.7.19 — pin a specific release.
• --dry-run — print what would happen without making any changes.
• --debug — verbose trace output (enables set -x).

Uninstall:

curl -sSL https://raw.githubusercontent.com/act101-ai/act101/main/install.sh | sh -s -- uninstall

2. PowerShell installer (Windows)

irm https://raw.githubusercontent.com/act101-ai/act101/main/install.ps1 | iex

Non-interactive:

iex "& { $(irm https://raw.githubusercontent.com/act101-ai/act101/main/install.ps1) } -AcceptTermsOfService yes -InstallClaudePlugin yes"

3. Claude Code marketplace (if you already have act on PATH)

If the shell installer has already placed act on your PATH, or you built from source, you can register the plugin directly with Claude Code:

claude plugin marketplace add act101-ai/act101
claude plugin install act101@act101-marketplace

On first session start the plugin's launcher locates the act binary already on your PATH (version-matched). If none is present it falls back to downloading one under ${CLAUDE_PLUGIN_DATA}/bin. Node 18+ on PATH is required for the launcher either way.

Tool list and skills are described in plugin/README.md.

4. Manual download

Grab the archive for your platform from the latest release, verify against SHA256SUMS.txt, extract, and place act (or act.exe) on your PATH.

# Linux x86_64 (static musl build)
curl -LO https://github.com/act101-ai/act101/releases/latest/download/act-x86_64-unknown-linux-musl.tar.gz
tar xzf act-x86_64-unknown-linux-musl.tar.gz
install -m 755 act ~/.local/bin/act

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Supported platforms

OS	Architecture	Archive
Linux	x86_64	act-x86_64-unknown-linux-musl.tar.gz (static)
Linux	x86_64	act-x86_64-unknown-linux-gnu.tar.gz
Linux	aarch64	act-aarch64-unknown-linux-gnu.tar.gz
macOS	x86_64	act-x86_64-apple-darwin.tar.gz
macOS	aarch64	act-aarch64-apple-darwin.tar.gz
Windows	x86_64	act-x86_64-pc-windows-msvc.zip
Windows	aarch64	act-aarch64-pc-windows-msvc.zip

The Linux musl build is statically linked and has no libc version requirement — use it if you see GLIBC_X.YY not found from the glibc build.

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First-run Terms of Service

act requires one-time Terms of Service acceptance before any tool runs. The shell installer walks you through it. Outside the installer, accept from a terminal:

act tos show     # read the terms
act tos accept   # record acceptance

Under the Claude Code plugin, the MCP server always starts but gates every tool behind the TOS. Use the tos_show and tos_accept tools — Claude Code's standard tool-consent UI is the acceptance surface.

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Generous free tier

act is free for personal and open-source use — forever. No license key, no account, no expiration. All query tools, all core languages, rename, fix-auto, and three analysis tools — included permanently.