265 pages for root.

Multi Round-Trip Requests Model Context Protocol · in the page specification/2026-07-28/basic/patterns/mrtr …requests. Servers **MUST** send server-to-client requests (such as > `roots/list`, `sampling/createMessage`, or `elicitation/create`) using the > MRTR pattern. The previous pattern of server-initiated… Streamable HTTP Model Context Protocol · in the page specification/2026-07-28/basic/transports/streamable-http …nal response. * Server-to-client interactions (sampling, elicitation, roots) are embedded in results as input requests per [Multi Round-Trip Requests (MRTR)][mrtr] ([SEP-2322][sep-2322]). * Long-l… Versioning and Compatibility Model Context Protocol · in the page specification/2026-07-28/basic/versioning …contextprotocol/ui`: ```json theme={null} { "capabilities": { "roots": {}, "extensions": { "io.modelcontextprotocol/ui": { "mimeTypes": ["text/html;profile=mcp-app"] }… Key Changes Model Context Protocol · in the page specification/2026-07-28/changelog …ull/2575)). 5. Remove `ping`, `logging/setLevel`, and `notifications/roots/list_changed`. Log level is now set per-request via `io.modelcontextprotocol/logLevel` in `_meta`; servers MUST NOT emit `no… Deprecated Features Model Context Protocol · in the page specification/2026-07-28/deprecated …ted in | Migration path | Earliest removal | | - | - | - | - | - | | [Roots](https://modelcontextprotocol.io/specification/2026-07-28/client/roots.md) | [SEP-2577](https://github.com/modelcontextproto… Tools Model Context Protocol · in the page specification/2026-07-28/server/tools …plied to properties that are *statically reachable* from the schema root, as defined in [Custom Headers from Tool Parameters](https://modelcontextprotocol.io/specification/2026-07-28/basic/transpo… Architecture Model Context Protocol · in the page specification/draft/architecture/index …cused responsibilities * Request client input (sampling, elicitation, roots) via `InputRequiredResult` within a reply * Must respect security constraints * Can be local processes or remote services #… Authorization Server Discovery Model Context Protocol · in the page specification/draft/basic/authorization/authorization-server-discovery …mple.com/.well-known/oauth-protected-resource/public/mcp` * At the root: `https://example.com/.well-known/oauth-protected-resource` MCP clients **MUST** support both discovery mechanisms and use t… Overview Model Context Protocol · in the page specification/draft/basic/index …s exposed by servers * **Client Features**: Elicitation, sampling and root directory lists provided by clients * **Utilities**: Cross-cutting concerns like logging and argument completion All impleme… Overview Model Context Protocol · in the page specification/draft/basic/patterns/index …Requests When a server needs client input (sampling, elicitation, or roots) to complete a request, it answers with an [`InputRequiredResult`](https://modelcontextprotocol.io/specification/draft/basic… Multi Round-Trip Requests Model Context Protocol · in the page specification/draft/basic/patterns/mrtr …requests. Servers **MUST** send server-to-client requests (such as > `roots/list`, `sampling/createMessage`, or `elicitation/create`) using the > MRTR pattern. The previous pattern of server-initiated… Streamable HTTP Model Context Protocol · in the page specification/draft/basic/transports/streamable-http …nal response. * Server-to-client interactions (sampling, elicitation, roots) are embedded in results as input requests per [Multi Round-Trip Requests (MRTR)][mrtr] ([SEP-2322][sep-2322]). * Long-l… Versioning and Compatibility Model Context Protocol · in the page specification/draft/basic/versioning …contextprotocol/ui`: ```json theme={null} { "capabilities": { "roots": {}, "extensions": { "io.modelcontextprotocol/ui": { "mimeTypes": ["text/html;profile=mcp-app"] }… Deprecated Features Model Context Protocol · in the page specification/draft/deprecated …ted in | Migration path | Earliest removal | | - | - | - | - | - | | [Roots](https://modelcontextprotocol.io/specification/draft/client/roots.md) | [SEP-2577](https://github.com/modelcontextprotocol/m… Tools Model Context Protocol · in the page specification/draft/server/tools …plied to properties that are *statically reachable* from the schema root, as defined in [Custom Headers from Tool Parameters](https://modelcontextprotocol.io/specification/draft/basic/transports/s…