ACT CLI & Build Tools

Host and build ACT (Agent Component Tools) WebAssembly components.

This repo contains two tools:

• act — run, call, inspect, and serve ACT components from local files, HTTP URLs, or OCI registries
• act-build — post-process compiled WASM components: embed metadata, skills, and custom sections

Install

# act (CLI host)
npm i -g @actcore/act
pip install act-cli
cargo install act-cli

# act-build (build tool)
npm i -g @actcore/act-build
pip install act-build
cargo install act-build

Pre-built binaries available on GitHub Releases and Docker (ghcr.io/actcore/act).

act — Component Host

# Discover tools in a component
act info --tools ghcr.io/actpkg/sqlite:0.1.0

# Call a tool
act call ghcr.io/actpkg/sqlite:0.1.0 query \
  --args '{"sql":"SELECT sqlite_version()"}' \
  --metadata '{"database_path":"/data/app.db"}' \
  --allow-dir /data:./data

# Serve over HTTP
act run -l ghcr.io/actpkg/sqlite:0.1.0

# Serve over MCP stdio
act run --mcp ghcr.io/actpkg/sqlite:0.1.0

Components can be referenced as:

• OCI refs: ghcr.io/actpkg/sqlite:0.1.0
• HTTP URLs: https://example.com/component.wasm
• Local paths: ./component.wasm

Remote components are cached in ~/.cache/act/components/.

Commands

| Command | Description | |---------|-------------| | run | Serve a component over ACT-HTTP (-l) or MCP stdio (--mcp) | | call | Call a tool directly, print result to stdout | | info | Show component metadata, tools, and schemas (--tools, --format text\|json) | | pull | Download a component from OCI or HTTP to local file |

HTTP Endpoints (run -l)

| Method | Path | Description | |--------|------|-------------| | GET | /info | Component metadata | | POST | /metadata-schema | JSON Schema for metadata | | POST/QUERY | /tools | List tools | | POST/QUERY | /tools/{name} | Call a tool (SSE with Accept: text/event-stream) |

act-build — Component Build Tool

# Embed act:component metadata, act:skill, and WASM custom sections
act-build pack target/wasm32-wasip2/release/my_component.wasm

# Validate without modifying
act-build validate target/wasm32-wasip2/release/my_component.wasm

Metadata is resolved via merge-patch from project manifests:

1. Base from Cargo.toml, pyproject.toml, or package.json (name, version, description)
2. Inline patch from the same manifest ([package.metadata.act-component], [tool.act-component], or actComponent)
3. act.toml — highest priority, applied last

Platform Support

| Architecture | Linux (GNU) | Linux (musl) | macOS | Windows | Docker | |-------------|:-----------:|:------------:|:-----:|:-------:|:------:| | x86_64 | ✓ | ✓ | ✓ | ✓ | ✓ | | aarch64 | ✓ | ✓ | ✓ | ✓ | ✓ | | riscv64 | ✓ | ✓ | — | — | ✓ |

RISC-V (riscv64) is a first-class target. Regressions on RISC-V are release-blocking.

Building

cargo build --release        # both tools
cargo build -p act-cli       # act only
cargo build -p act-build     # act-build only

Set RUST_LOG=act=debug for verbose output.

License

MIT OR Apache-2.0