[abcsnowwolf]

• drop the claims the code does not back: resources are not served, tools/list schemas are advertised but never validated against, and Arduino IDE is not usable without a library.properties
• document the call(JsonDocument, bool&) overload, the isError result flag, the -32603 an escaping exception becomes, Tool::outputSchema, and the rvalue RegisterTool overload
• replace the "never stalls the async TCP task" promise with the two cases that do occupy it, in a new "Where a tool call actually runs" section: the bounded fast-path wait, and the inline fallback when the worker cannot start
• complete the request-handling table with the -32700, -32600, 404, 505, and 500 paths, and state that protocol failures after a valid envelope are HTTP 200 carrying a JSON-RPC error
• qualify the 505: it precedes the fast path whenever a worker exists, so only a missing worker lets an HTTP/1.0 tools/call through
• scope the MCP-Protocol-Version header to JSON-RPC responses; the 405 and 202 replies carry only what ESPAsyncWebServer emits, plus Allow: POST on the 405
• spell out the DNS-rebinding guard, which also requires Host, an http:// origin and Origin == Host, and the mDNS slug rules behind .local
• fix the WiFi snippet to match the example, and add detect_leaks=0 to the ASan invocation so the documented command matches CI and does not fail on Linux
• list the native-omit-text and native-cov environments