client = x402Client()               # pays per call, on Base
r = await http.post(".../answer")   # x402 settles the quote
dossier = r.json()["dossier"]       # -> the verdict, as JSON

Run the exact call an agent makes — a real POST /answer, live against the running engine. You see the JSON the agent gets back.

# FastMCP server "rederive"
@mcp.tool()
def get_derivation(node): ...   # get_derivation("s_verdict")
@mcp.tool()
def recall(q, limit): ...       # keyword search the memory

Point any MCP client at the server; the agent’s model calls these tools directly — no glue code.

graph = build_langgraph(engine)
# Rederive becomes the memory node inside the agent's own workflow