a1-compiler 0.1.3

A modern agent compiler for building and executing LLM-powered agents

The agent compiler framework

A1 is a new kind of agent framework. It takes an Agent (a set of tools and a description) and compiles either AOT (ahead-of-time) into a Tool or JIT (just-in-time) for immediate execution optimized for each unique agent input.

uv pip install a1-compiler
# or
pip install a1-compiler

🏎️ Why use an agent compiler?

An agent compiler is a direct replacement for agent frameworks such as Langchain or aisdk, where you define an Agent and run. The diference is:

1. Safety: A1 generates code for each unique agent input, optimizing constantly to shrink the prompt injection attack surface.
2. Speed: A1 makes codegen practical for tool-wielding agents with aggressive parallelism and static checking.
3. Determinism: A1 optimizes for determinism via an engineered cost function. For example, it may replace an LLM call with a fast RegEx but may revert on-the-fly if a tool's schema evolves.
4. Flexibility A tool in A1 can be instantly constructed from an OpenAPI document, an MCP server, a DB connection string, an fsspec path, a Python function, a Python package, or even just a documentation website URL.

Agent compilers emerged from frustration with the MCP protocol and SOTA agent frameworks where every agent runs a static while loop program. Slow, unsafe, and highly nondeterministic.

An agent compiler can perform the same while loop (just set Verify=IsLoop()) but has the freedom to explore superoptimal execution plans, while subject to engineered constraints (e.g. type-safety).

Ultimately the goal is "determinism-maxing": specifying as much of your task as fully deterministic code (100% accuracy) and gradually reducing non-deterministic LLM calls to the bare minimum.

🚀 How to get started?

from a1 import Agent, tool, LLM
from pydantic import BaseModel

# Define a simple tool
@tool(name="add", description="Add two numbers")
async def add(a: int, b: int) -> int:
    return a + b

# Define input/output schemas
class MathInput(BaseModel):
    problem: str

class MathOutput(BaseModel):
    answer: int

# Create an agent with tools and LLM
agent = Agent(
    name="math_agent",
    description="Solves simple math problems",
    input_schema=MathInput, # like DSPy modules, A1 agent behavior is specified via schemas. The difference is that in A1, an engineer may implement a Verify function to enforce agent-specific constraints such as order of tool calling.
    output_schema=MathOutput,
    tools=[add, LLM(model="gpt-4.1")],  # in A1, LLMs are tools!
)

async def main():
    # Compile ahead-of-time
    compiled = await agent.aot()
    result = await compiled.execute(problem="What is 2 + 2?")
    print(f"AOT result: {result}")

    # Or execute just-in-time
    result = await agent.jit(problem="What is 5 + 3?")
    print(f"JIT result: {result}")

import asyncio
asyncio.run(main())

See the tests/ directory for extensive examples of everything A1 can do. Docs coming soon to docs.a1project.org

✨ Features

• Import any Langchain agent
• Observability via OpenTelemetry
• Tools instantiated from MCP or OpenAPI
• RAG instantiated given any SQL database or fsspec path (e.g. s3://my-place/here, gs://..., or local filesystem)
• Skills defined manually or by crawling online docs
• Context engineering via a simple API that lets compiled code manage multi-agent behavior
• Zero lock-in use any LLM, any secure code execution cloud
• Only gets better as researchers develop increasingly powerful methods to Generate, Cost estimate, and Verify agent code

🙋 FAQ

Should I use A1 or Langchain/aisdk/etc?

Prefer A1 if your task is latency-critical, works with untrusted data, or may need to run code.

Is A1 production-ready?

Yes in terms of API stability. The caveat is that A1 is new.

Can we get enterprise support?

Please don't hesitate to reach out ([e-mail])

🤝 Contributing

Awesome! See our Contributing Guide for details.

📄 MIT License

As it should be!

📜 Citation

Paper coming soon! Reach out if you'd like to contribute.