ONCE — Exactly-Once Reliability for AI Agent Actions for LangChain
io.github.gsterlingpress/once
Prevent duplicate AI-agent side effects with idempotency, verification, and durable receipts.
client:LangChain
transport:streamable-http
Install ONCE — Exactly-Once Reliability for AI Agent Actions in LangChain
pip install langchain-mcp-adapters
from langchain_mcp_adapters.client import MultiServerMCPClient
client = MultiServerMCPClient({
"once": {
"transport": "streamable_http",
"url": "https://optimistic-compassion-production.up.railway.app/mcp",
}
})
tools = await client.get_tools()
get_tools() returns the server's tools as LangChain tools, ready for an agent. LangChain docs