888 pages for tools.

Tasks Model Context Protocol · in the page extensions/tasks/overview …m participant Client participant Server Client->>Server: tools/call (with tasks capability) Server-->>Client: CreateTaskResult (taskId, status: working) loop Poll until terminal… The MCP Registry Moderation Policy Model Context Protocol · in the page registry/moderation-policy …nt, which includes obscene content, copyright violations, and hacking tools * Malware, regardless of intentions * Spam, especially mass-created servers that disrupt the registry. Examples: * The sam… SEP-1034: Support default values for all primitive types in elicitation schemas Model Context Protocol · in the page seps/1034--support-default-values-for-all-primitive-types-in …ion Elicitations in MCP offer a way to mitigate complex API designs: tools can request information on-demand rather than resorting to convoluted parameter handling. The challenge however is that user… SEP-1302: Formalize Working Groups and Interest Groups in MCP Governance Model Context Protocol · in the page seps/1302-formalize-working-groups-and-interest-groups-in-mc …acts for SEP consideration (e.g. hosting, UI, tool-interfaces, search-tools) With SEP-994 resulting in the merging of the Discord communities, we have a need to: * Merge the existing initiatives int… SEP-1303: Input Validation Errors as Tool Execution Errors Model Context Protocol · in the page seps/1303-input-validation-errors-as-tool-execution-errors …xtprotocol/pull/1303) | *** ## Abstract This SEP proposes treating tools input validation errors as Tool Execution Errors rather than Protocol Errors. This change would enable language models to re… SEP-1319: Decouple Request Payload from RPC Methods Definition Model Context Protocol · in the page seps/1319-decouple-request-payload-from-rpc-methods-definiti …={null} export interface CallToolRequest extends Request { method: "tools/call"; params: { name: string; arguments?: { [key: string]: unknown }; }; } ``` ### Proposed Approach (Decouple… SEP-1613: Establish JSON Schema 2020-12 as Default Dialect for MCP Model Context Protocol · in the page seps/1613-establish-json-schema-2020-12-as-default-dialect-f …fault dialect * The `inputSchema` field **MUST NOT** be `null` **For tools with no parameters**, use one of these valid approaches: * `true` - accepts any input (most permissive) * `{}` - equivalent… SEP-1686: Tasks Model Context Protocol · in the page seps/1686-tasks …s dropped, clients must call the tool again, which is undesirable for tools expected to take minutes or more. This is particularly relevant for MCP servers abstracting existing workflow-based APIs, su… SEP-1865: MCP Apps - Interactive User Interfaces for MCP Model Context Protocol · in the page seps/1865-mcp-apps-interactive-user-interfaces-for-mcp …laring UI resources via the `ui://` URI scheme, associating them with tools through metadata, and facilitating bi-directional communication between the UI and the host using MCP's JSON-RPC base protoc… SEP-2133: Extensions Model Context Protocol · in the page seps/2133-extensions …: { "protocolVersion": "2025-06-18", "capabilities": { "tools": {}, "extensions": { "io.modelcontextprotocol/ui": {} } }, "serverInfo": { "name": "Examp… SEP-2148: MCP Contributor Ladder Model Context Protocol · in the page seps/2148-contributor-ladder …munity platforms (Discord, GitHub Discussions) * Access to moderation tools and private moderation channels * Authority to issue warnings, mute, or temporarily ban users for Code of Conduct violations… SEP-2243: HTTP Header Standardization for Streamable HTTP Transport Model Context Protocol · in the page seps/2243-http-standardization …ork intermediaries such as load balancers, proxies, and observability tools can route and process MCP traffic without deep packet inspection, reducing latency and computational overhead. ## Motivatio… SEP-2260: Require Server requests to be associated with a Client request. Model Context Protocol · in the page seps/2260-Require-Server-requests-to-be-associated-with-Client-requests …ssociated with an originating client-to-server request (e.g., during `tools/call`, `resources/read`, or `prompts/get` processing). Standalone server-initiated requests of these types outside notificat… SEP-2322: Multi Round-Trip Requests Model Context Protocol · in the page seps/2322-MRTR …uests. We start with the observation that there are two types of MCP tools: 1. **Ephemeral**: No state is accumulated on the server side. * If server needs more info to process the tool call, it… SEP-2549: TTL for List Results Model Context Protocol · in the page seps/2549-TTL-for-list-results …proposes adding fields to support caching result objects returned by `tools/list`, `prompts/list`, `resources/list`, `resources/read`, and `resources/templates/list`. Two fields will be added `ttlMs`… SEP-2567: Sessionless MCP via Explicit State Handles Model Context Protocol · in the page seps/2567-sessionless-mcp …ransaction, an open file descriptor. 4. **Mutable list endpoints.** `tools/list` (and `resources/list`, `prompts/list`) can legally return different results over a session's lifetime. For example, a… SEP-2575: Make MCP Stateless Model Context Protocol · in the page seps/2575-stateless-mcp …e used by clients to improve an LLM's * understanding of available tools (e.g., by including it in a system prompt). */ instructions?: string; } ``` ### Per-Request Client Capabilities To co… SEP-2640: Skills Extension Model Context Protocol · in the page seps/2640-skills-extension …anied by implementation guidelines for host-provided resource-reading tools and SDK-level convenience wrappers. ## Motivation Native skills support in host applications demonstrates strong demand fo… SEP-2663: Tasks Extension Model Context Protocol · in the page seps/2663-tasks-extension …This SEP defines an extension that allows a server to respond to a `tools/call` request with an asynchronous *task handle* instead of a final result, allowing the client to retrieve the eventual res… SEP-414: Document OpenTelemetry Trace Context Propagation Conventions Model Context Protocol · in the page seps/414-request-meta …e ```json theme={null} { "jsonrpc": "2.0", "id": 2, "method": "tools/call", "params": { "name": "get_weather", "arguments": { "location": "New York" }, "_meta": {… SEP-986: Specify Format for Tool Names Model Context Protocol · in the page seps/986-specify-format-for-tool-names …ming. While some conventions (like lower-kebab-case) are common, many tools and clients use uppercase, underscores, dots, and slashes for namespacing or clarity. The proposed pattern—allowing a-z, A-Z… Specification Enhancement Proposals (SEPs) Model Context Protocol · in the page seps/index …s Track | 2025-01-21 | | [SEP-2106](/seps/2106-json-schema-2020-12) | Tools `inputSchema` & `outputSchema` Conform to JSON Schema 2020-12 | <Badge color="green" shape="pill">Final</Badge> | Standards… Architecture Model Context Protocol · in the page specification/2024-11-05/architecture/index …rs provide specialized context and capabilities: * Expose resources, tools and prompts via MCP primitives * Operate independently with focused responsibilities * Request sampling through client inter… Overview Model Context Protocol · in the page specification/2024-11-05/basic/index …and session control * **Server Features**: Resources, prompts, and tools exposed by servers * **Client Features**: Sampling and root directory lists provided by clients * **Utilities**: Cross-cutti… Lifecycle Model Context Protocol · in the page specification/2024-11-05/basic/lifecycle …"subscribe": true, "listChanged": true }, "tools": { "listChanged": true } }, "serverInfo": { "name": "ExampleServer", "version": "1.0.0"… Specification Model Context Protocol · in the page specification/2024-11-05/index …ss integration between LLM applications and external data sources and tools. Whether you're building an AI-powered IDE, enhancing a chat interface, or creating custom AI workflows, MCP provides a stan… Overview Model Context Protocol · in the page specification/2024-11-05/server/index …red data or content that provides additional context to the model * **Tools**: Executable functions that allow models to perform actions or retrieve information Each primitive can be summarized in… Pagination Model Context Protocol · in the page specification/2024-11-05/server/utilities/pagination …List resource templates * `prompts/list` - List available prompts * `tools/list` - List available tools ## Implementation Guidelines 1. Servers **SHOULD**: * Provide stable cursors * Handle i… Architecture Model Context Protocol · in the page specification/2025-03-26/architecture/index …rs provide specialized context and capabilities: * Expose resources, tools and prompts via MCP primitives * Operate independently with focused responsibilities * Request sampling through client inter… Overview Model Context Protocol · in the page specification/2025-03-26/basic/index …and session control * **Server Features**: Resources, prompts, and tools exposed by servers * **Client Features**: Sampling and root directory lists provided by clients * **Utilities**: Cross-cutti… Lifecycle Model Context Protocol · in the page specification/2025-03-26/basic/lifecycle …"subscribe": true, "listChanged": true }, "tools": { "listChanged": true } }, "serverInfo": { "name": "ExampleServer", "version": "1.0.0"… Specification Model Context Protocol · in the page specification/2025-03-26/index …ss integration between LLM applications and external data sources and tools. Whether you're building an AI-powered IDE, enhancing a chat interface, or creating custom AI workflows, MCP provides a stan… Overview Model Context Protocol · in the page specification/2025-03-26/server/index …red data or content that provides additional context to the model * **Tools**: Executable functions that allow models to perform actions or retrieve information Each primitive can be summarized in… Pagination Model Context Protocol · in the page specification/2025-03-26/server/utilities/pagination …List resource templates * `prompts/list` - List available prompts * `tools/list` - List available tools ## Implementation Guidelines 1. Servers **SHOULD**: * Provide stable cursors * Handle i… Architecture Model Context Protocol · in the page specification/2025-06-18/architecture/index …rs provide specialized context and capabilities: * Expose resources, tools and prompts via MCP primitives * Operate independently with focused responsibilities * Request sampling through client inter… Overview Model Context Protocol · in the page specification/2025-06-18/basic/index …HTTP-based transports * **Server Features**: Resources, prompts, and tools exposed by servers * **Client Features**: Sampling and root directory lists provided by clients * **Utilities**: Cross-cutti… Lifecycle Model Context Protocol · in the page specification/2025-06-18/basic/lifecycle …"subscribe": true, "listChanged": true }, "tools": { "listChanged": true } }, "serverInfo": { "name": "ExampleServer", "title": "Example Se… Key Changes Model Context Protocol · in the page specification/2025-06-18/changelog …support for [structured tool output](/specification/2025-06-18/server/tools#structured-content) (PR [#371](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/371)) 3. Classify MCP se… Specification Model Context Protocol · in the page specification/2025-06-18/index …ss integration between LLM applications and external data sources and tools. Whether you're building an AI-powered IDE, enhancing a chat interface, or creating custom AI workflows, MCP provides a stan… Schema Reference Model Context Protocol · in the page specification/2025-06-18/schema …a prompt or tool call result.</p> <p>Note: resource links returned by tools are not guaranteed to appear in the results of <code>resources/list</code> requests.</p> </div> <section class="tsd-panel ts… Overview Model Context Protocol · in the page specification/2025-06-18/server/index …red data or content that provides additional context to the model * **Tools**: Executable functions that allow models to perform actions or retrieve information Each primitive can be summarized in… Pagination Model Context Protocol · in the page specification/2025-06-18/server/utilities/pagination …List resource templates * `prompts/list` - List available prompts * `tools/list` - List available tools ## Implementation Guidelines 1. Servers **SHOULD**: * Provide stable cursors * Handle i… Architecture Model Context Protocol · in the page specification/2025-11-25/architecture/index …rs provide specialized context and capabilities: * Expose resources, tools and prompts via MCP primitives * Operate independently with focused responsibilities * Request sampling through client inter… Overview Model Context Protocol · in the page specification/2025-11-25/basic/index …HTTP-based transports * **Server Features**: Resources, prompts, and tools exposed by servers * **Client Features**: Sampling and root directory lists provided by clients * **Utilities**: Cross-cutti… Lifecycle Model Context Protocol · in the page specification/2025-11-25/basic/lifecycle …"subscribe": true, "listChanged": true }, "tools": { "listChanged": true }, "tasks": { "list": {}, "cancel": {}, "requests": {… Tasks Model Context Protocol · in the page specification/2025-11-25/basic/utilities/tasks …l` | Server supports the `tasks/cancel` operation | | `tasks.requests.tools.call` | Server supports task-augmented `tools/call` requests | ```json theme={null} { "capabilities": { "tasks": {… Key Changes Model Context Protocol · in the page specification/2025-11-25/changelog …ull/797)) 2. Allow servers to expose icons as additional metadata for tools, resources, resource templates, and prompts ([SEP-973](https://github.com/modelcontextprotocol/modelcontextprotocol/issues/9… Elicitation Model Context Protocol · in the page specification/2025-11-25/client/elicitation …r participant Client participant Server Client->>Server: tools/call Note over Server: Server needs authorization Server->>Client: URLElicitationRequiredError Note over Client… Sampling Model Context Protocol · in the page specification/2025-11-25/client/sampling …Present generated responses for review before delivery </Warning> ## Tools in Sampling Servers can request that the client's LLM use tools during sampling by providing a `tools` array and optional `… Specification Model Context Protocol · in the page specification/2025-11-25/index …ss integration between LLM applications and external data sources and tools. Whether you're building an AI-powered IDE, enhancing a chat interface, or creating custom AI workflows, MCP provides a stan…