CrewHaus Factory

The open-source meta-harness compiler for AI agents.

Compile a single spec (a crewhaus.yaml) into a CLI agent, channel bot, RAG pipeline, multi-agent crew, eval harness, voice/realtime agent, browser/computer-use agent, and more. Active eval optimization. Trust-aware by default. Apache-2.0.

★ If CrewHaus is useful to you, star the repo. For an independent, Apache-2.0 project maintained in the open, a star is the clearest signal the work is worth continuing.

# Install the standalone binary — no runtime required:
brew tap crewhaus/tap && brew install crewhaus          # macOS / Linux (Homebrew)
# Windows: scoop install crewhaus · winget install CrewHaus.CLI
# Debian/Ubuntu (apt) and npm/Bun: see "Install" below

crewhaus --version
crewhaus init my-agent
cd my-agent
crewhaus compile crewhaus.yaml -o build && crewhaus run crewhaus.yaml

crewhaus is open source under Apache-2.0 and published as a bare package on npm, Homebrew, Scoop, winget, and apt — see Install.

Install

The fastest path is the self-contained binary — one file, no Bun/Node required:

# macOS / Linux (Homebrew)
brew tap crewhaus/tap && brew install crewhaus

# Windows (Scoop)
scoop bucket add crewhaus https://github.com/crewhaus/scoop-bucket
scoop install crewhaus

# Windows (winget)
winget install CrewHaus.CLI

# Debian / Ubuntu (apt)
curl -fsSL https://crewhaus.github.io/apt/key.gpg | sudo gpg --dearmor -o /usr/share/keyrings/crewhaus.gpg
echo "deb [signed-by=/usr/share/keyrings/crewhaus.gpg] https://crewhaus.github.io/apt stable main" | sudo tee /etc/apt/sources.list.d/crewhaus.list
sudo apt update && sudo apt install crewhaus

Prefer npm? The crewhaus package runs on Bun ≥ 1.2:

npm install -g crewhaus        # global
bun add -d crewhaus            # project-local dev dependency

Then confirm your install:

crewhaus --version

You can also grab a binary directly from the GitHub Releases page.

Why CrewHaus?

Write the agent once, as a spec (crewhaus.yaml). Compile it to the shape each situation calls for — a CLI to run locally, a Slack bot for the team, an eval bundle to grade it — each emitted as code idiomatic to that runtime, not a generic wrapper.

When the spec changes, every shape recompiles. Run the eval loop and crewhaus optimize rewrites the spec from its failures, so the fix lands in all of them. CrewHaus is the layer above the runtimes.

What you can compile to

These target shapes ship today:

Target	What it produces
cli	A self-contained TypeScript CLI agent
channel (slack / discord / telegram / whatsapp / imessage)	Channel bots
graph	A stateful graph runtime
pipeline	A RAG pipeline
crew	A multi-agent crew
research	An autonomous research agent
batch	A batch worker
voice	A voice/realtime agent
browser	A browser/computer-use agent
managed	A managed multi-tenant runtime
eval	An eval bundle for grading other targets
workflow	A workflow orchestration runtime
onchain	An on-chain (EVM) agent runtime
onchain-game	An on-chain game runtime

Adding a new target shape starts at the IR, not at codegen. See COMPILER-ARCHITECTURE.md.

The three pillars

1. The compiler is the protagonist. Specs flow through parseSpec → lower → applyPasses → emit. The IR is a discriminated union of target-shape variants; each emitter consumes its own typed variant.

2. Eval is active, not passive. Eval failures produce spec patches. crewhaus optimize searches the mutation space (rule-based or Claude-driven) and writes back through a YAML CST that preserves comments and key order. The loop closes.

3. Security is a fabric, not a perimeter. Untrusted content — MCP responses, sub-agent returns, channel inbound messages, federation payloads, skill bodies, compaction summaries — is classified by a single boundary classifier, tagged with TrustOrigin, before it reaches a model call. Authentication verifies who; classification verifies what.

Full architecture: AI-Harness-Systems.md, COMPILER-ARCHITECTURE.md, AGENTS.md.

Quickstart

Install crewhaus (see Install) — the binary needs no runtime; the npm package needs Bun ≥ 1.2.

# Create a new agent project — writes a minimal `crewhaus.yaml`
crewhaus init my-agent
cd my-agent

If you'd rather develop against the workspace directly (contributing to factory itself), see CONTRIBUTING.md for the clone-and-link workflow.

crewhaus init writes a runnable starter spec:

# crewhaus.yaml
name: my-agent
target: cli
agent:
  model: claude-opus-4-7
  instructions: |
    You are a helpful assistant. Replace these instructions with your
    agent's actual behavior, persona, and constraints.

Edit the instructions block to describe what your agent should do, then:

# Set a provider credential — the default model is Anthropic; the full
# provider matrix (OpenAI, Gemini, Bedrock, Vertex, Azure, Groq/Together/
# OpenRouter/…, and local servers via local/<model>@<url>) is in
# packages/model-router/README.md and factory/.env.example.
export ANTHROPIC_API_KEY=sk-ant-...

# Compile crewhaus.yaml to a runnable bundle in ./build
crewhaus compile crewhaus.yaml -o build

# Run the agent
crewhaus run crewhaus.yaml

To compile to a different shape, change target: in crewhaus.yaml to one of the values from the table above (channel, pipeline, eval, …) and re-run crewhaus compile.

Example: one spec, multiple shapes

The two specs below share an identical agent: block — only target: changes. The same agent compiles to either a local CLI or a browser/computer-use agent, with no other config.

# cli.yaml — runs in a terminal
name: research-assistant
target: cli
agent:
  model: claude-sonnet-4-6
  instructions: |
    You help users research a topic. Given a question, produce a
    short, cited summary. If you have browser tools, start by calling
    Navigate to load https://duckduckgo.com/html/, then use Screenshot
    to read what came back before answering.

# browser.yaml — same agent, driven against a real browser
name: research-assistant
target: browser
agent:
  model: claude-sonnet-4-6
  instructions: |
    You help users research a topic. Given a question, produce a
    short, cited summary. If you have browser tools, start by calling
    Navigate to load https://duckduckgo.com/html/, then use Screenshot
    to read what came back before answering.

# Compile to runnable bundles
crewhaus compile cli.yaml     -o build/cli      # local CLI agent
crewhaus compile browser.yaml -o build/browser  # browser/computer-use agent

# Or run directly — no compile step needed
crewhaus run cli.yaml                                   # interactive terminal
crewhaus run browser.yaml --prompt "research X"         # one-shot browser session

The browser target launches a headless Chromium via Playwright — run bunx playwright install chromium once if you don't already have it. The compiled bundle and crewhaus run use the same runtime; pick whichever fits your deployment.

Same agent. Different runtimes. Only target: changed.

Example: tools and richer shapes

The example above needs no tools. Most real agents do — and tools come from two places. Built-in tools go in a tools: list (read, write, edit, bash, grep, webFetch, webSearch, …). MCP server tools are auto-discovered: declare the server under mcp_servers: and every tool it exposes is registered for you — you never list them by hand.

# triage.yaml — a CLI agent backed by a GitHub MCP server
name: github-issue-triage
target: cli
agent:
  model: claude-sonnet-4-6
  instructions: |
    You triage GitHub issues by reading them and assigning labels.
mcp_servers:
  github:
    transport: stdio
    command: npx
    args: ["-y", "@modelcontextprotocol/server-github"]
    env:
      GITHUB_PERSONAL_ACCESS_TOKEN: $GITHUB_TOKEN

Richer shapes keep that same agent: (and mcp_servers:) block and layer their own config on top — only target: and the shape-specific block change. The same triage agent becomes a Slack bot, or an eval graded against a labeled dataset:

# slack.yaml — same agent, dispatched as a Slack bot
name: github-issue-triage
target: channel
agent:
  model: claude-sonnet-4-6
  instructions: |
    You triage GitHub issues by reading them and assigning labels.
mcp_servers:
  github:
    transport: stdio
    command: npx
    args: ["-y", "@modelcontextprotocol/server-github"]
    env:
      GITHUB_PERSONAL_ACCESS_TOKEN: $GITHUB_TOKEN
channels:
  slack:
    botToken: $SLACK_BOT_TOKEN
    signingSecret: $SLACK_SIGNING_SECRET
routing:
  sessionKey: thread

# eval.yaml — same agent, graded against a labeled dataset
name: github-issue-triage
target: eval
agent:
  model: claude-sonnet-4-6
  instructions: |
    You triage GitHub issues by reading them and assigning labels.
dataset:
  name: triage-cases
  version: v1
  split: dev
graders:
  - name: exact_match
concurrency: 4

crewhaus compile triage.yaml -o build/cli     # CLI agent with GitHub MCP tools
crewhaus compile slack.yaml  -o build/slack   # Slack bot
crewhaus compile eval.yaml   -o build/eval    # eval bundle

Other shapes follow the same rule — retrieve: + indexing: for a RAG pipeline, queue: for a batch worker, voice: for a realtime agent — but the agent: block stays identical across all of them.

Documentation

• New here? Start with Getting Started — a guided tour from first principles to a runnable agent.
• Looking for a recipe? See Recipes Index — 40+ task-oriented walkthroughs.
• Need the module reference? See Module Catalog — full module catalog across the target-shape variants.
• Contributing? See CONTRIBUTING.md.

Tooling around the compiler

The compiler, runtime, eval stack, and security fabric live in this repo. Tooling that sits around the compiler — Studio, IDE extensions, the browser playground — lives in crewhaus/utilities, and the section-* example specs live in crewhaus/demos. Both consume factory via tsconfig path aliases.

• Studio (studio-server + studio-ui, with wizard, scaffold-templates, trace-viewer, graph-visualizer, plugin-sdk) — Bun.serve daemon for spec authoring, run inspection, and plugin discovery.
• IDE extensions — VS Code, JetBrains, browser playground.
• Section example specs — demos/smoke holds the per-section reference specs (section-15-smoke, section-33-discord-smoke, etc.) used to drive integration runs.

Crewhaus Forge

Community registry for shared harnesses, skills, tools, and recipes. Coming Summer 2026. See what's coming →

Contributing

Contributions are welcome. CrewHaus is async-first and BDFL-lite — see GOVERNANCE.md for how decisions are made and CONTRIBUTING.md for how to contribute.

Quick links:

• Good first issues
• Help wanted
• Open RFCs
• contributing/your-first-target.md — adding a new target shape end-to-end

Support

Async, best-effort, community-driven. See SUPPORT.md for the channels and what to expect.

• GitHub Discussions and Issues

Security

Vulnerability reports go to a private channel, not GitHub Issues. See SECURITY.md.

License

Apache License 2.0. The Apache-2.0 license covers the code. CrewHaus, Crewhaus Factory, Crewhaus Cloud, Crewhaus Forge, and the logo are trademarks; see TRADEMARK.md for use-of-marks policy.

Documentation is licensed under Creative Commons Attribution 4.0.

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