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Completion Model Context Protocol · in the page specification/2025-03-26/server/utilities/completion # Completion The Model Context Protocol (MCP) provides a standardized way for servers to offer argument autocompletion suggestions for prompts and resource URIs. This enables rich, IDE-like experienc… Logging Model Context Protocol · in the page specification/2025-03-26/server/utilities/logging # Logging The Model Context Protocol (MCP) provides a standardized way for servers to send structured log messages to clients. Clients can control logging verbosity by setting minimum log levels, wit… Pagination Model Context Protocol · in the page specification/2025-03-26/server/utilities/pagination # Pagination The Model Context Protocol (MCP) supports paginating list operations that may return large result sets. Pagination allows servers to yield results in smaller chunks rather than all at on… Architecture Model Context Protocol · in the page specification/2025-06-18/architecture/index # Architecture The Model Context Protocol (MCP) follows a client-host-server architecture where each host can run multiple client instances. This architecture enables users to integrate AI capabiliti… Authorization Model Context Protocol · in the page specification/2025-06-18/basic/authorization # Authorization ## Introduction ### Purpose and Scope The Model Context Protocol provides authorization capabilities at the transport level, enabling MCP clients to make requests to restricted MCP… Overview Model Context Protocol · in the page specification/2025-06-18/basic/index # Overview The Model Context Protocol consists of several key components that work together: * **Base Protocol**: Core JSON-RPC message types * **Lifecycle Management**: Connection initialization, c… Lifecycle Model Context Protocol · in the page specification/2025-06-18/basic/lifecycle # Lifecycle The Model Context Protocol (MCP) defines a rigorous lifecycle for client-server connections that ensures proper capability negotiation and state management. 1. **Initialization**: Capabi… Cancellation Model Context Protocol · in the page specification/2025-06-18/basic/utilities/cancellation # Cancellation The Model Context Protocol (MCP) supports optional cancellation of in-progress requests through notification messages. Either side can send a cancellation notification to indicate that… Ping Model Context Protocol · in the page specification/2025-06-18/basic/utilities/ping # Ping The Model Context Protocol includes an optional ping mechanism that allows either party to verify that their counterpart is still responsive and the connection is alive. ## Overview The ping… Progress Model Context Protocol · in the page specification/2025-06-18/basic/utilities/progress # Progress The Model Context Protocol (MCP) supports optional progress tracking for long-running operations through notification messages. Either side can send progress notifications to provide updat… Key Changes Model Context Protocol · in the page specification/2025-06-18/changelog # Key Changes This document lists changes made to the Model Context Protocol (MCP) specification since the previous revision, [2025-03-26](/specification/2025-03-26.md). ## Major changes 1. Remove… Elicitation Model Context Protocol · in the page specification/2025-06-18/client/elicitation …ification and its design may evolve in future protocol versions. The Model Context Protocol (MCP) provides a standardized way for servers to request additional information from users through the clie… Roots Model Context Protocol · in the page specification/2025-06-18/client/roots # Roots The Model Context Protocol (MCP) provides a standardized way for clients to expose filesystem "roots" to servers. Roots define the boundaries of where servers can operate within the filesyste… Sampling Model Context Protocol · in the page specification/2025-06-18/client/sampling # Sampling The Model Context Protocol (MCP) provides a standardized way for servers to request LLM sampling ("completions" or "generations") from language models via clients. This flow allows clients… Specification Model Context Protocol · in the page specification/2025-06-18/index # Specification [Model Context Protocol](https://modelcontextprotocol.io) (MCP) is an open protocol that enables seamless integration between LLM applications and external data sources and tools. Whe… Schema Reference Model Context Protocol · in the page specification/2025-06-18/schema …ing of available resources. It can be thought of like a "hint" to the model.</p> </div><aside class="tsd-sources"> <p>Inherited from <a href="#resource">Resource</a>.<a href="#resource-description">de… Overview Model Context Protocol · in the page specification/2025-06-18/server/index …rovide the fundamental building blocks for adding context to language models via MCP. These primitives enable rich interactions between clients, servers, and language models: * **Prompts**: Pre-defin… Prompts Model Context Protocol · in the page specification/2025-06-18/server/prompts # Prompts The Model Context Protocol (MCP) provides a standardized way for servers to expose prompt templates to clients. Prompts allow servers to provide structured messages and instructions for int… Resources Model Context Protocol · in the page specification/2025-06-18/server/resources # Resources The Model Context Protocol (MCP) provides a standardized way for servers to expose resources to clients. Resources allow servers to share data that provides context to language models, su… Tools Model Context Protocol · in the page specification/2025-06-18/server/tools # Tools The Model Context Protocol (MCP) allows servers to expose tools that can be invoked by language models. Tools enable models to interact with external systems, such as querying databases, call… Completion Model Context Protocol · in the page specification/2025-06-18/server/utilities/completion # Completion The Model Context Protocol (MCP) provides a standardized way for servers to offer argument autocompletion suggestions for prompts and resource URIs. This enables rich, IDE-like experienc… Logging Model Context Protocol · in the page specification/2025-06-18/server/utilities/logging # Logging The Model Context Protocol (MCP) provides a standardized way for servers to send structured log messages to clients. Clients can control logging verbosity by setting minimum log levels, wit… Pagination Model Context Protocol · in the page specification/2025-06-18/server/utilities/pagination # Pagination The Model Context Protocol (MCP) supports paginating list operations that may return large result sets. Pagination allows servers to yield results in smaller chunks rather than all at on… Architecture Model Context Protocol · in the page specification/2025-11-25/architecture/index # Architecture The Model Context Protocol (MCP) follows a client-host-server architecture where each host can run multiple client instances. This architecture enables users to integrate AI capabiliti… Authorization Model Context Protocol · in the page specification/2025-11-25/basic/authorization # Authorization ## Introduction ### Purpose and Scope The Model Context Protocol provides authorization capabilities at the transport level, enabling MCP clients to make requests to restricted MCP… Overview Model Context Protocol · in the page specification/2025-11-25/basic/index # Overview The Model Context Protocol consists of several key components that work together: * **Base Protocol**: Core JSON-RPC message types * **Lifecycle Management**: Connection initialization, c… Lifecycle Model Context Protocol · in the page specification/2025-11-25/basic/lifecycle # Lifecycle The Model Context Protocol (MCP) defines a rigorous lifecycle for client-server connections that ensures proper capability negotiation and state management. 1. **Initialization**: Capabi… Cancellation Model Context Protocol · in the page specification/2025-11-25/basic/utilities/cancellation # Cancellation The Model Context Protocol (MCP) supports optional cancellation of in-progress requests through notification messages. Either side can send a cancellation notification to indicate that… Ping Model Context Protocol · in the page specification/2025-11-25/basic/utilities/ping # Ping The Model Context Protocol includes an optional ping mechanism that allows either party to verify that their counterpart is still responsive and the connection is alive. ## Overview The ping… Progress Model Context Protocol · in the page specification/2025-11-25/basic/utilities/progress # Progress The Model Context Protocol (MCP) supports optional progress tracking for long-running operations through notification messages. Either side can send progress notifications to provide updat… Tasks Model Context Protocol · in the page specification/2025-11-25/basic/utilities/tasks …gn and behavior of tasks may evolve in future protocol versions. The Model Context Protocol (MCP) allows requestors — which can be either clients or servers, depending on the direction of communicati… Key Changes Model Context Protocol · in the page specification/2025-11-25/changelog # Key Changes This document lists changes made to the Model Context Protocol (MCP) specification since the previous revision, [2025-06-18](/specification/2025-06-18.md). ## Major changes 1. Enhance… Elicitation Model Context Protocol · in the page specification/2025-11-25/client/elicitation # Elicitation The Model Context Protocol (MCP) provides a standardized way for servers to request additional information from users through the client during interactions. This flow allows clients to… Roots Model Context Protocol · in the page specification/2025-11-25/client/roots # Roots The Model Context Protocol (MCP) provides a standardized way for clients to expose filesystem "roots" to servers. Roots define the boundaries of where servers can operate within the filesyste… Sampling Model Context Protocol · in the page specification/2025-11-25/client/sampling # Sampling The Model Context Protocol (MCP) provides a standardized way for servers to request LLM sampling ("completions" or "generations") from language models via clients. This flow allows clients… Specification Model Context Protocol · in the page specification/2025-11-25/index # Specification [Model Context Protocol](https://modelcontextprotocol.io) (MCP) is an open protocol that enables seamless integration between LLM applications and external data sources and tools. Whe… Schema Reference Model Context Protocol · in the page specification/2025-11-25/schema …ing of available resources. It can be thought of like a "hint" to the model.</p> </div><aside class="tsd-sources"> <p>Inherited from <a href="#resource">Resource</a>.<a href="#resource-description">de… Overview Model Context Protocol · in the page specification/2025-11-25/server/index …rovide the fundamental building blocks for adding context to language models via MCP. These primitives enable rich interactions between clients, servers, and language models: * **Prompts**: Pre-defin… Prompts Model Context Protocol · in the page specification/2025-11-25/server/prompts # Prompts The Model Context Protocol (MCP) provides a standardized way for servers to expose prompt templates to clients. Prompts allow servers to provide structured messages and instructions for int… Resources Model Context Protocol · in the page specification/2025-11-25/server/resources # Resources The Model Context Protocol (MCP) provides a standardized way for servers to expose resources to clients. Resources allow servers to share data that provides context to language models, su… Tools Model Context Protocol · in the page specification/2025-11-25/server/tools # Tools The Model Context Protocol (MCP) allows servers to expose tools that can be invoked by language models. Tools enable models to interact with external systems, such as querying databases, call… Completion Model Context Protocol · in the page specification/2025-11-25/server/utilities/completion # Completion The Model Context Protocol (MCP) provides a standardized way for servers to offer autocompletion suggestions for the arguments of prompts and resource templates. When users are filling i… Logging Model Context Protocol · in the page specification/2025-11-25/server/utilities/logging # Logging The Model Context Protocol (MCP) provides a standardized way for servers to send structured log messages to clients. Clients can control logging verbosity by setting minimum log levels, wit… Pagination Model Context Protocol · in the page specification/2025-11-25/server/utilities/pagination # Pagination The Model Context Protocol (MCP) supports paginating list operations that may return large result sets. Pagination allows servers to yield results in smaller chunks rather than all at on… Architecture Model Context Protocol · in the page specification/2026-07-28/architecture/index # Architecture The Model Context Protocol (MCP) follows a client-host-server architecture where each host can run multiple client instances. MCP is a stateless protocol: every request is self-contain… Authorization Model Context Protocol · in the page specification/2026-07-28/basic/authorization/index # Authorization ## Introduction ### Purpose and Scope The Model Context Protocol provides authorization capabilities at the transport level, enabling MCP clients to make requests to restricted MCP… Overview Model Context Protocol · in the page specification/2026-07-28/basic/index # Overview The Model Context Protocol consists of several key components that work together: * **Base Protocol**: Core JSON-RPC message types * **Versioning and Compatibility**: Protocol version neg… Cancellation Model Context Protocol · in the page specification/2026-07-28/basic/patterns/cancellation # Cancellation The Model Context Protocol (MCP) supports optional cancellation of in-progress requests through notification messages. A client **SHOULD** send a cancellation notification to indicate… Multi Round-Trip Requests Model Context Protocol · in the page specification/2026-07-28/basic/patterns/mrtr …equest examples on this page omit the `_meta` request > metadata (`io.modelcontextprotocol/protocolVersion`, > `io.modelcontextprotocol/clientInfo`, and > `io.modelcontextprotocol/clientCapabilities`)… Progress Model Context Protocol · in the page specification/2026-07-28/basic/patterns/progress # Progress The Model Context Protocol (MCP) supports optional progress tracking for long-running operations through notification messages. The server **MAY** send progress notifications to report the…