Vystak framework adapter — generates LangChain/LangGraph agent code
Project description
vystak-adapter-langchain
Framework adapter that generates LangChain / LangGraph agent code from a Vystak Agent definition.
Vystak targets frameworks — it doesn't abstract them. This adapter emits idiomatic LangGraph react-agent code plus a FastAPI harness and A2A protocol endpoints, written as plain Python source files you can read, debug, and extend.
Install
pip install vystak-adapter-langchain
Usually you don't install this directly — vystak-cli depends on it and invokes it automatically.
What it generates
For each vystak apply, the adapter writes:
agent.py— LangGraphcreate_react_agentsetup bound to the configured model and toolsserver.py— FastAPI server exposing/invoke,/stream,/health,/.well-known/agent.json,/a2arequirements.txt— pinned runtime deps (langgraph,langchain-anthropic,fastapi, etc.)- Session/memory stores — wired up automatically when
sessionsormemoryare declared on the agent - Tool stubs — scaffolded from
tools/directory of Python files
A2A protocol
Generated servers implement Google's Agent-to-Agent JSON-RPC 2.0 protocol — agents discover each other via /.well-known/agent.json and communicate via /a2a with tasks/send, tasks/sendSubscribe, tasks/get, tasks/cancel.
License
Apache-2.0
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