Cowboy SDK

The official Python SDK for developing autonomous actors on the Cowboy PVM (Python Virtual Machine).

With this SDK, you can write fully deterministic on-chain Python code that interacts natively with LLMs, APIs, and the broader Cowboy ecosystem.

Features

• Decentralized AI Agents: Write prompt chains, FSM-based LLM logic, and MCP integrations directly in Python.
• @runner.continuation: Turn Python async functions into verified Finite State Machines (FSMs) capable of pausing execution, offloading heavy compute (LLM inference, HTTP requests) to Runners, and seamlessly resuming on the next block.
• Robust Determinism: The SDK strips away standard Python non-determinism (time, random, set) and replaces it with consensus-safe primitives.
• CBOR-backed State: The CowboyModel and self.storage dict provide automatic schema validation and canonical CBOR serialization for zero-boilerplate state management.
• Built-in Async Primitives: Leverage TaskGroup for concurrent Runner tasks, Retry for robust backoff logic, and bounded_loop to ensure safety limits.

Quick Start

pip install cowboy-sdk

from cowboy_sdk import actor, runner, capture

@actor
class MyAgent:
    def init(self, payload):
        self.storage["calls"] = 0
        return b"ok"

    @runner.continuation
    async def chat(self, msg):
        ctx = capture()
        ctx.prompt = msg.get("message", "Hello")
        
        # Off-chain heavy compute (LLM) securely verified via consensus
        result = await runner.llm(ctx.prompt, system_prompt="You are a helpful assistant")
        
        # Execution resumes here on the next block
        chat_id = self.storage.get("calls", 0)
        self.storage[f"reply:{chat_id}"] = result
        self.storage["calls"] = chat_id + 1
        
        return b"ok"

def _a(): return MyAgent()
def init(p): return _a().init(p)
def chat(p): return _a().chat(p)
def chat__resume(p): return _a().chat__resume(p)
def on_runner_result(p): return _a().on_runner_result(p)

Documentation & Tools

• Developer Manual: View on GitHub
• Vibe Coding Blueprint (Claude Code): Learn how to set up autonomous development without local chain dependencies. View Guide.
• Cowboy CLI: Pre-compiled binary required to deploy and send transactions. Download from the GitHub Releases.

License

MIT License. See the repository for details.