Pygent 0.2

Pygent is a PyTorch-like framework for composing stateless LLM agents from reusable Module graphs. Version 0.2 provides a single Execution owner for direct and managed calls, an asyncio Runtime, observable model/tool events, OpenAI-compatible adapters, portable tools and MCP adapters, ReAct, SQLite recovery, and HTTP/SSE workers.

First principles

Pygent 0.2 第一原则 is the repository's highest authority. Module-specific first principles, SDK contracts, tests, examples, and code derive from it.

Quickstart

from pygent import AIMessage, Context, Module, UserMessage


class Echo(Module[UserMessage, AIMessage]):
    async def forward(self, message, context):
        output = AIMessage(content=message.content.upper())
        return output, context + message + output


message, context = await Echo().invoke(UserMessage(content="hello"), Context())

Direct invoke(), stream(), and start() need no Runtime. Bind the same graph to LocalRuntime when the application needs bounded concurrency, cancellation, deadlines, remote placement, durable history, or advanced Execution control. Both modes execute the same forward() graph and return (message, context); see the 0.2 Execution contract.

Documentation

Development

uv sync --all-extras
uv run pytest -q
uv run ruff check src tests examples benchmarks
uv run mypy src benchmarks
uv build
python -m examples.service.main
uv run --extra performance python -m benchmarks run synthetic-smoke

Python 3.11+ is required. Apache-2.0; see LICENSE.

Key dates

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Requires

Python >=3.11

Provides Extra

performance dev

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