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SEP-990: Enable enterprise IdP policy controls during MCP OAuth flows Model Context Protocol · in the page seps/990-enable-enterprise-idp-policy-controls-during-mcp-o …st.md) and its changelog for authoritative > requirements. | Field | Value | | - | - | | **SEP** | 990 | | **Title** | Enable enterprise IdP policy controls during MCP OAuth flows | | **Status** | Fi…

SEP-991: Enable URL-based Client Registration using OAuth Client ID Metadata Documents Model Context Protocol · in the page seps/991-enable-url-based-client-registration-using-oauth-c …st.md) and its changelog for authoritative > requirements. | Field | Value | | - | - | | **SEP** | 991 | | **Title** | Enable URL-based Client Registration using OAuth Client ID Metadata Documents |…

Specification Enhancement Proposals (SEPs) Model Context Protocol · in the page seps/index …andards Track | 2025-07-22 | | [SEP-1034](/seps/1034--support-default-values-for-all-primitive-types-in.md) | Support default values for all primitive types in elicitation schemas | Final | Standards…

Progress Model Context Protocol · in the page specification/2024-11-05/basic/utilities/progress …request metadata. * Progress tokens **MUST** be a string or integer value * Progress tokens can be chosen by the sender using any means, but **MUST** be unique across all active requests. ```json…

Sampling Model Context Protocol · in the page specification/2024-11-05/client/sampling …rities Servers express their needs through three normalized priority values (0-1): * `costPriority`: How important is minimizing costs? Higher values prefer cheaper models. * `speedPriority`: How im…

Prompts Model Context Protocol · in the page specification/2024-11-05/server/prompts …method": "prompts/list", "params": { "cursor": "optional-cursor-value" } } ``` **Response:** ```json theme={null} { "jsonrpc": "2.0", "id": 1, "result": { "prompts": [ {…

Resources Model Context Protocol · in the page specification/2024-11-05/server/resources …thod": "resources/list", "params": { "cursor": "optional-cursor-value" } } ``` **Response:** ```json theme={null} { "jsonrpc": "2.0", "id": 1, "result": { "resources": [ {…

Tools Model Context Protocol · in the page specification/2024-11-05/server/tools …"method": "tools/list", "params": { "cursor": "optional-cursor-value" } } ``` **Response:** ```json theme={null} { "jsonrpc": "2.0", "id": 1, "result": { "tools": [ {…

Completion Model Context Protocol · in the page specification/2024-11-05/server/utilities/completion …es where users receive contextual suggestions while entering argument values. ## User Interaction Model Completion in MCP is designed to support interactive user experiences similar to IDE code comp…

Progress Model Context Protocol · in the page specification/2025-03-26/basic/utilities/progress …request metadata. * Progress tokens **MUST** be a string or integer value * Progress tokens can be chosen by the sender using any means, but **MUST** be unique across all active requests. ```json…

Sampling Model Context Protocol · in the page specification/2025-03-26/client/sampling …rities Servers express their needs through three normalized priority values (0-1): * `costPriority`: How important is minimizing costs? Higher values prefer cheaper models. * `speedPriority`: How im…

Prompts Model Context Protocol · in the page specification/2025-03-26/server/prompts …method": "prompts/list", "params": { "cursor": "optional-cursor-value" } } ``` **Response:** ```json theme={null} { "jsonrpc": "2.0", "id": 1, "result": { "prompts": [ {…

Resources Model Context Protocol · in the page specification/2025-03-26/server/resources …thod": "resources/list", "params": { "cursor": "optional-cursor-value" } } ``` **Response:** ```json theme={null} { "jsonrpc": "2.0", "id": 1, "result": { "resources": [ {…

Tools Model Context Protocol · in the page specification/2025-03-26/server/tools …"method": "tools/list", "params": { "cursor": "optional-cursor-value" } } ``` **Response:** ```json theme={null} { "jsonrpc": "2.0", "id": 1, "result": { "tools": [ {…

Completion Model Context Protocol · in the page specification/2025-03-26/server/utilities/completion …es where users receive contextual suggestions while entering argument values. ## User Interaction Model Completion in MCP is designed to support interactive user experiences similar to IDE code comp…

Authorization Model Context Protocol · in the page specification/2025-06-18/basic/authorization …servers **MUST** validate exact redirect URIs against pre-registered values to prevent redirection attacks. MCP clients **SHOULD** use and verify state parameters in the authorization code flow and…

Overview Model Context Protocol · in the page specification/2025-06-18/basic/index …, as specified below; implementations MUST NOT make assumptions about values at these keys. Additionally, definitions in the [schema](https://github.com/modelcontextprotocol/specification/blob/main/s…

Progress Model Context Protocol · in the page specification/2025-06-18/basic/utilities/progress …request metadata. * Progress tokens **MUST** be a string or integer value * Progress tokens can be chosen by the sender using any means, but **MUST** be unique across all active requests. ```json…

Elicitation Model Context Protocol · in the page specification/2025-06-18/client/elicitation …, // or "decline" or "cancel" "content": { "propertyName": "value", "anotherProperty": 42 } } } ``` The three response actions are: 1. **Accept** (`action: "accept"`): User exp…

Sampling Model Context Protocol · in the page specification/2025-06-18/client/sampling …rities Servers express their needs through three normalized priority values (0-1): * `costPriority`: How important is minimizing costs? Higher values prefer cheaper models. * `speedPriority`: How im…

Schema Reference Model Context Protocol · in the page specification/2025-06-18/schema …omment tsd-typography"><p>Additional information about the error. The value of this member is defined by the sender (e.g. detailed error information, nested errors etc.).</p> </div></li></ul></div></s…

Prompts Model Context Protocol · in the page specification/2025-06-18/server/prompts …method": "prompts/list", "params": { "cursor": "optional-cursor-value" } } ``` **Response:** ```json theme={null} { "jsonrpc": "2.0", "id": 1, "result": { "prompts": [ {…

Resources Model Context Protocol · in the page specification/2025-06-18/server/resources …thod": "resources/list", "params": { "cursor": "optional-cursor-value" } } ``` **Response:** ```json theme={null} { "jsonrpc": "2.0", "id": 1, "result": { "resources": [ {…

Tools Model Context Protocol · in the page specification/2025-06-18/server/tools …"method": "tools/list", "params": { "cursor": "optional-cursor-value" } } ``` **Response:** ```json theme={null} { "jsonrpc": "2.0", "id": 1, "result": { "tools": [ {…

Completion Model Context Protocol · in the page specification/2025-06-18/server/utilities/completion …es where users receive contextual suggestions while entering argument values. ## User Interaction Model Completion in MCP is designed to support interactive user experiences similar to IDE code comp…

Authorization Model Context Protocol · in the page specification/2025-11-25/basic/authorization …ta not found Note over C: Abort or use pre-configured values end end end Note over C: Validate RS metadata,<br />build AS metadata URL C->>A: GET Auth…

Overview Model Context Protocol · in the page specification/2025-11-25/basic/index …, as specified below; implementations MUST NOT make assumptions about values at these keys. Additionally, definitions in the [schema](https://github.com/modelcontextprotocol/specification/blob/main/s…

Progress Model Context Protocol · in the page specification/2025-11-25/basic/utilities/progress …request metadata. * Progress tokens **MUST** be a string or integer value * Progress tokens can be chosen by the sender using any means, but **MUST** be unique across all active requests. ```json…

Tasks Model Context Protocol · in the page specification/2025-11-25/basic/utilities/tasks …rt for tasks via `execution.taskSupport`, which if present can have a value of `"required"`, `"optional"`, or `"forbidden"`. This is to be interpreted as a fine-grained layer in addition to capabilit…

Key Changes Model Context Protocol · in the page specification/2025-11-25/changelog …rotocol/modelcontextprotocol/issues/985)). 9. Add support for default values in all primitive types (string, number, enum) for elicitation schemas ([SEP-1034](https://github.com/modelcontextprotocol/m…

Elicitation Model Context Protocol · in the page specification/2025-11-25/client/elicitation …etter guidance to users All primitive types support optional default values to provide sensible starting points. Clients that support defaults SHOULD pre-populate form fields with these values. Note…

Sampling Model Context Protocol · in the page specification/2025-11-25/client/sampling …xt": {} } } } ``` > [!NOTE] > > The `includeContext` parameter values `"thisServer"` and `"allServers"` are > soft-deprecated. Servers **SHOULD** avoid using these values (e.g. can just > omit…

Schema Reference Model Context Protocol · in the page specification/2025-11-25/schema …scribes how important this data is for operating the server.</p> <p>A value of 1 means "most important," and indicates that the data is effectively required, while 0 means "least important," and ind…

Prompts Model Context Protocol · in the page specification/2025-11-25/server/prompts …method": "prompts/list", "params": { "cursor": "optional-cursor-value" } } ``` **Response:** ```json theme={null} { "jsonrpc": "2.0", "id": 1, "result": { "prompts": [ {…

Resources Model Context Protocol · in the page specification/2025-11-25/server/resources …thod": "resources/list", "params": { "cursor": "optional-cursor-value" } } ``` **Response:** ```json theme={null} { "jsonrpc": "2.0", "id": 1, "result": { "resources": [ {…

Tools Model Context Protocol · in the page specification/2025-11-25/server/tools …"method": "tools/list", "params": { "cursor": "optional-cursor-value" } } ``` **Response:** ```json theme={null} { "jsonrpc": "2.0", "id": 1, "result": { "tools": [ {…

Completion Model Context Protocol · in the page specification/2025-11-25/server/utilities/completion …of prompts and resource templates. When users are filling in argument values for a specific prompt (identified by name) or resource template (identified by URI), servers can provide contextual suggest…

Authorization Server Discovery Model Context Protocol · in the page specification/2026-07-28/basic/authorization/authorization-server-discovery …ect-discovery-1_0.html#ProviderConfigurationValidation): the `issuer` value in the document **MUST** be identical to the issuer identifier used to construct the well-known URL. If they differ, the cli…

Client Registration Model Context Protocol · in the page specification/2026-07-28/basic/authorization/client-registration …ient_name`, `redirect_uris` * Clients **MUST** ensure the `client_id` value in the metadata matches the document URL exactly * Clients **MAY** use `private_key_jwt` for client authentication (e.g., fo…

Authorization Model Context Protocol · in the page specification/2026-07-28/basic/authorization/index …e redirecting the user-agent, the client **MUST** record the `issuer` value from the selected authorization server's validated metadata document (see [Authorization Server Metadata Discovery](/specifi…

Authorization Security Considerations Model Context Protocol · in the page specification/2026-07-28/basic/authorization/security-considerations …servers **MUST** validate exact redirect URIs against pre-registered values to prevent redirection attacks. MCP clients **SHOULD** use and verify state parameters in the authorization code flow and…

Overview Model Context Protocol · in the page specification/2026-07-28/basic/index …information needed. * Extensions **MAY** add additional `ResultType` values. The set of supported `ResultType` values **MUST** be created from the set defined in the core protocol and include any add…

Multi Round-Trip Requests Model Context Protocol · in the page specification/2026-07-28/basic/patterns/mrtr …server-client requests. Keys are server-assigned string identifiers; values are request objects (e.g., [`ElicitRequest`](/specification/2026-07-28/schema#elicitrequest), [`CreateMessageRequest`](/spe…

Progress Model Context Protocol · in the page specification/2026-07-28/basic/patterns/progress …request metadata. * Progress tokens **MUST** be a string or integer value * Progress tokens can be chosen by the client using any means, but **MUST** be unique across all active requests. ```json…

Subscriptions Model Context Protocol · in the page specification/2026-07-28/basic/patterns/subscriptions …ifying the `subscriptions/listen` request that opened the stream. The value is the JSON-RPC ID of the `subscriptions/listen` request. In the examples above, the request used `"id": 1`, so the acknowle…

Streamable HTTP Model Context Protocol · in the page specification/2026-07-28/basic/transports/streamable-http …header. For example: `MCP-Protocol-Version: 2026-07-28` The header value **MUST** match the `io.modelcontextprotocol/protocolVersion` field carried in the request body's `_meta`. If the values do n…

Key Changes Model Context Protocol · in the page specification/2026-07-28/changelog …chema 2020-12 keywords, and `structuredContent` to allow any JSON value. Add `$ref` resolution requirements and composition-keyword resource bounds ([SEP-2106](https://github.com/modelcont…