How much does the MCP protocol cost in latency versus raw REST? For each case the script issues 100 identical calls over each transport and records wall-clock latency from the client side. The overhead column is the median difference (MCP - REST).
Run FA_API_KEY=<key> python scripts/refresh-mcp-vs-rest-benchmark.py to populate wwwroot/data/mcp-vs-rest-benchmark.json. The runner takes ~2 minutes for 6 cases × 100 calls × 2 transports.