--- title: "Multi round-trip request (MRTR): definition | Agent MCP Directory" description: "Multi round-trip request (MRTR): The 2026-07-28 pattern where a server returns input_required and the client retries the request with the answers." canonical: https://agentmcpdirectory.com/glossary/multi-round-trip-request site: "Agent MCP Directory" last_updated: 2026-11-04 section: "Glossary" --- # Multi round-trip request (MRTR): definition | Agent MCP Directory > Multi round-trip request (MRTR): The 2026-07-28 pattern where a server returns input_required and the client retries the request with the answers. Source: https://agentmcpdirectory.com/glossary/multi-round-trip-request Site: Agent MCP Directory Last reviewed: 2026-11-04 # Multi round-trip request (MRTR) Multi round-trip request (MRTR): The 2026-07-28 pattern where a server returns input\_required and the client retries the request with the answers. Example: It replaces server-initiated requests such as elicitation/create. Next in the glossary is Namespace verification: Proof that a publisher controls a registry name, by GitHub login or OIDC for io.github names and DNS or HTTP for domains. ## Definition The 2026-07-28 pattern where a server returns input\_required and the client retries the request with the answers. ## Example, with source It replaces server-initiated requests such as elicitation/create. ([modelcontextprotocol.io](https://modelcontextprotocol.io/specification/2026-07-28/changelog), read 4 November 2026) ## Neighbouring terms - [Model Context Protocol (MCP)](https://agentmcpdirectory.com/glossary/model-context-protocol/): A JSON-RPC 2.0 protocol in which hosts run clients that connect to servers offering tools, resources and prompts. - [Namespace verification](https://agentmcpdirectory.com/glossary/namespace-verification/): Proof that a publisher controls a registry name, by GitHub login or OIDC for io.github names and DNS or HTTP for domains. - [NLWeb](https://agentmcpdirectory.com/glossary/nlweb/): Microsoft's open project giving sites a natural-language ask method with Schema.org JSON responses; each instance is an MCP server. Edition 4 November 2026 Method [How rows are verified](https://agentmcpdirectory.com/method/) Data [CSV and JSON](https://agentmcpdirectory.com/data/) Markdown [This page as markdown](https://agentmcpdirectory.com/glossary/multi-round-trip-request/index.md) ## Sources - [Source for the Multi round-trip request (MRTR) example](https://modelcontextprotocol.io/specification/2026-07-28/changelog), read 4 November 2026 Last reviewed 4 November 2026