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Key Changes Model Context Protocol · in the page specification/2026-07-28/changelog …eturned by `tools/list`, `prompts/list`, `resources/list`, `resources/read`, and `resources/templates/list` via a new `CacheableResult` interface. `ttlMs` is a freshness hint (in milliseconds) allowin… Elicitation Model Context Protocol · in the page specification/2026-07-28/client/elicitation …(defaults to `"form"` if omitted). | | `message` | string | | A human-readable message explaining why the interaction is needed. | The `mode` parameter specifies the type of elicitation: * `"form"`:… Roots Model Context Protocol · in the page specification/2026-07-28/client/roots …file://` URI in the current specification. * `name`: Optional human-readable name for display purposes. Example roots for different use cases: #### Project Directory ```json theme={null} { "uri… Deprecated Features Model Context Protocol · in the page specification/2026-07-28/deprecated …inal | The HTTP+SSE transport and the `includeContext` values were already described as deprecated before the lifecycle policy existed; SEP-2596 reclassifies them as Deprecated under its [transition… Schema Reference Model Context Protocol · in the page specification/2026-07-28/schema …d-comment tsd-typography"><p>A resource that the server is capable of reading, included in a prompt or tool call result.</p> <p>Note: resource links returned by tools are not guaranteed to appear in t… Prompts Model Context Protocol · in the page specification/2026-07-28/server/prompts …* `name`: Unique identifier for the prompt * `title`: Optional human-readable name of the prompt for display purposes. * `description`: Optional human-readable description * `icons`: Optional array o… Resources Model Context Protocol · in the page specification/2026-07-28/server/resources …rsor", "ttlMs": 300000, "cacheScope": "public" } } ``` ### Reading Resources To retrieve resource contents, clients send a `resources/read` request. This operation supports [caching](/spec… Tools Model Context Protocol · in the page specification/2026-07-28/server/tools …: * `name`: Unique identifier for the tool * `title`: Optional human-readable name of the tool for display purposes. * `description`: Human-readable description of functionality * `icons`: Optional a… Caching Model Context Protocol · in the page specification/2026-07-28/server/utilities/caching …ts/list` * `resources/list` * `resources/templates/list` * `resources/read` Interim results with `resultType: "input_required"` (see [multi round-trip requests](/specification/2026-07-28/basic/patter… Completion Model Context Protocol · in the page specification/2026-07-28/server/utilities/completion …value * `context`: Object containing: * `arguments`: A mapping of already-resolved argument names to their values. ### CompleteResult * `completion`: Object containing: * `values`: Array of sugg… Architecture Model Context Protocol · in the page specification/draft/architecture/index …lar design supports extensibility 3. **Servers should not be able to read the whole conversation, nor "see into" other servers** * Servers receive only necessary contextual information * Ful… Authorization Model Context Protocol · in the page specification/draft/basic/authorization/index …nown/oauth-protected-resource", scope="files:read" ``` When implementing authorization flows, MCP clients **SHOULD** follow the principle of least privilege by requesting onl… Overview Model Context Protocol · in the page specification/draft/basic/index …t they correspond to (except in error cases where the ID could not be read due a malformed request). * Error responses **MUST** include an `error` field with a `code` and `message`. * Error codes **MU… Cancellation Model Context Protocol · in the page specification/draft/basic/patterns/cancellation …ions if: * The referenced request is unknown * Processing has already completed * The request cannot be cancelled 5. The client **SHOULD** ignore any response to the cancelled request that ar… Multi Round-Trip Requests Model Context Protocol · in the page specification/draft/basic/patterns/mrtr …fication/draft/server/prompts#getting-a-prompt) | Yes | | [`resources/read`](/specification/draft/server/resources#reading-resources) | Yes | | [`tools/call`](/specification/draft/server/tools#calling… Progress Model Context Protocol · in the page specification/draft/basic/patterns/progress …oating point. * The `message` field **SHOULD** provide relevant human readable progress information. ## Behavior Requirements 1. Progress notifications **MUST** only reference tokens that: * Were… stdio Model Context Protocol · in the page specification/draft/basic/transports/stdio …nds communicate over the subprocess's standard streams: * The server reads JSON-RPC messages from `stdin` and writes JSON-RPC messages to `stdout`. * Each message is a single JSON-RPC request, noti… Streamable HTTP Model Context Protocol · in the page specification/draft/basic/transports/streamable-http …`Mcp-Name` | `params.name` or `params.uri` | `tools/call`, `resources/read`, `prompts/get` requests | These headers are **REQUIRED** for compliance. If the `Mcp-Name` source value cannot be safely r… Elicitation Model Context Protocol · in the page specification/draft/client/elicitation …(defaults to `"form"` if omitted). | | `message` | string | | A human-readable message explaining why the interaction is needed. | The `mode` parameter specifies the type of elicitation: * `"form"`:… Roots Model Context Protocol · in the page specification/draft/client/roots …file://` URI in the current specification. * `name`: Optional human-readable name for display purposes. Example roots for different use cases: #### Project Directory ```json theme={null} { "uri… Deprecated Features Model Context Protocol · in the page specification/draft/deprecated …inal | The HTTP+SSE transport and the `includeContext` values were already described as deprecated before the lifecycle policy existed; SEP-2596 reclassifies them as Deprecated under its [transition… Schema Reference Model Context Protocol · in the page specification/draft/schema …d-comment tsd-typography"><p>A resource that the server is capable of reading, included in a prompt or tool call result.</p> <p>Note: resource links returned by tools are not guaranteed to appear in t… Prompts Model Context Protocol · in the page specification/draft/server/prompts …* `name`: Unique identifier for the prompt * `title`: Optional human-readable name of the prompt for display purposes. * `description`: Optional human-readable description * `icons`: Optional array o… Resources Model Context Protocol · in the page specification/draft/server/resources …rsor", "ttlMs": 300000, "cacheScope": "public" } } ``` ### Reading Resources To retrieve resource contents, clients send a `resources/read` request. This operation supports [caching](/spec… Tools Model Context Protocol · in the page specification/draft/server/tools …: * `name`: Unique identifier for the tool * `title`: Optional human-readable name of the tool for display purposes. * `description`: Human-readable description of functionality * `icons`: Optional a… Caching Model Context Protocol · in the page specification/draft/server/utilities/caching …ts/list` * `resources/list` * `resources/templates/list` * `resources/read` Interim results with `resultType: "input_required"` (see [multi round-trip requests](/specification/draft/basic/patterns/mr… Completion Model Context Protocol · in the page specification/draft/server/utilities/completion …value * `context`: Object containing: * `arguments`: A mapping of already-resolved argument names to their values. ### CompleteResult * `completion`: Object containing: * `values`: Array of sugg…