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Understanding MCP servers Model Context Protocol · in the page docs/2026-07-28/learn/server-concepts …s | Array of prompt descriptors | | `prompts/get` | Retrieve prompt details | Full prompt definition with arguments | #### Example: Streamlined Workflows Prompts provide structured templates for com…

SDKs Model Context Protocol · in the page docs/2026-07-28/sdk …System](https://modelcontextprotocol.io/community/sdk-tiers.md) for details on what each tier means. ## Getting Started Each SDK follows the idioms and best practices of its language. SDKs adopt new…

Debugging Model Context Protocol · in the page docs/2026-07-28/tools/debugging …de\logs` * Linux: `~/.config/Claude/logs` ```bash macOS theme={null} tail -n 20 -F ~/Library/Logs/Claude/mcp*.log ``` ```bash Linux theme={null} tail -n 20 -F ~/.config/Claude/logs/mcp*.log ``` ```…

CLI client Model Context Protocol · in the page docs/2026-07-28/tools/inspector/cli …ve` | `--server` | Same. | Stream- or session-only methods (`logging/tail`, for example) are rejected, since a process that exits can't hold a stream open. ### Passing arguments `--tool-arg` takes…

Protocol eras Model Context Protocol · in the page docs/2026-07-28/tools/inspector/protocol-eras …on shows a **"Mirrored request headers (SEP-2243)"** section in its detail panel, for example `city -> Mcp-Param-City`. * A tool with an **invalid** annotation (say, a header name of `"Bad Header"`, w…

Recipes Model Context Protocol · in the page docs/2026-07-28/tools/inspector/recipes …necting`, then `connected` or `error` (`data-error-message` has the detail) | | `[data-testid="connection-status"]` | `data-deeplink` | `parsed`, `rejected`, or `none` (`none` means no deep link was g…

Web client Model Context Protocol · in the page docs/2026-07-28/tools/inspector/web …onsole The three tabs show the same traffic at different levels of detail: * **Protocol**: the JSON-RPC transcript. Requests paired with responses, notifications inline, [MRTR](https://modelcontextp…

Understanding Authorization in MCP Model Context Protocol · in the page docs/2026-07-28/tutorials/security/authorization …ver: > > ```bash theme={null} > python server.py > ``` > > For more details, see [Authorization](https://py.sdk.modelcontextprotocol.io/run/authorization/) in the Python SDK documentation. > [tab] C#…

Security Best Practices Model Context Protocol · in the page docs/2026-07-28/tutorials/security/security_best_practices …oc/html/rfc9700). ## Attacks and Mitigations This section gives a detailed description of attacks on MCP implementations, along with potential countermeasures. ### Confused Deputy Problem Attacker…

Build an MCP server Model Context Protocol · in the page docs/draft/develop/build-server …rl) > > if not forecast_data: > return "Unable to fetch detailed forecast." > > # Format the periods into a readable forecast > periods = forecast_data["properties"]["periods"] >…

Client Best Practices Model Context Protocol · in the page docs/draft/develop/clients/client-best-practices …e-layer pattern below illustrates a custom search-based approach in detail, but the layered principle (catalog, inspect, execute) applies regardless of retrieval mechanism. ### Using Progressive Disc…

Connect to local MCP servers Model Context Protocol · in the page docs/draft/develop/connect-local-servers …ows, it will only show recent logs): > > ```bash macOS theme={null} > tail -n 20 -f ~/Library/Logs/Claude/mcp*.log > ``` > > ```bash Linux theme={null} > tail -n 20 -f ~/.config/Claude/logs/mcp*.log >…

Architecture overview Model Context Protocol · in the page docs/draft/learn/architecture …provide context to an AI application. For specific implementation details, please refer to the documentation for your [language-specific SDK](https://modelcontextprotocol.io/docs/draft/sdk.md). ##…

Understanding MCP clients Model Context Protocol · in the page docs/draft/learn/client-concepts …form", message: "Please confirm your Barcelona vacation booking details:", requestedSchema: { type: "object", properties: { confirmBooking: { type: "boolean",…

Understanding MCP servers Model Context Protocol · in the page docs/draft/learn/server-concepts …s | Array of prompt descriptors | | `prompts/get` | Retrieve prompt details | Full prompt definition with arguments | #### Example: Streamlined Workflows Prompts provide structured templates for com…

SDKs Model Context Protocol · in the page docs/draft/sdk …System](https://modelcontextprotocol.io/community/sdk-tiers.md) for details on what each tier means. ## Getting Started Each SDK follows the idioms and best practices of its language. SDKs adopt new…

Debugging Model Context Protocol · in the page docs/draft/tools/debugging …de\logs` * Linux: `~/.config/Claude/logs` ```bash macOS theme={null} tail -n 20 -F ~/Library/Logs/Claude/mcp*.log ``` ```bash Linux theme={null} tail -n 20 -F ~/.config/Claude/logs/mcp*.log ``` ```…

CLI client Model Context Protocol · in the page docs/draft/tools/inspector/cli …ve` | `--server` | Same. | Stream- or session-only methods (`logging/tail`, for example) are rejected, since a process that exits can't hold a stream open. ### Passing arguments `--tool-arg` takes…

Protocol eras Model Context Protocol · in the page docs/draft/tools/inspector/protocol-eras …on shows a **"Mirrored request headers (SEP-2243)"** section in its detail panel, for example `city -> Mcp-Param-City`. * A tool with an **invalid** annotation (say, a header name of `"Bad Header"`, w…

Recipes Model Context Protocol · in the page docs/draft/tools/inspector/recipes …necting`, then `connected` or `error` (`data-error-message` has the detail) | | `[data-testid="connection-status"]` | `data-deeplink` | `parsed`, `rejected`, or `none` (`none` means no deep link was g…

Web client Model Context Protocol · in the page docs/draft/tools/inspector/web …onsole The three tabs show the same traffic at different levels of detail: * **Protocol**: the JSON-RPC transcript. Requests paired with responses, notifications inline, [MRTR](https://modelcontextp…

Understanding Authorization in MCP Model Context Protocol · in the page docs/draft/tutorials/security/authorization …ver: > > ```bash theme={null} > python server.py > ``` > > For more details, see [Authorization](https://py.sdk.modelcontextprotocol.io/run/authorization/) in the Python SDK documentation. > [tab] C#…

Security Best Practices Model Context Protocol · in the page docs/draft/tutorials/security/security_best_practices …oc/html/rfc9700). ## Attacks and Mitigations This section gives a detailed description of attacks on MCP implementations, along with potential countermeasures. ### Confused Deputy Problem Attacker…

Build an MCP App Model Context Protocol · in the page extensions/apps/build …nsions.modelcontextprotocol.io/api/) > > Full SDK reference and API details > [card] [GitHub Repository](https://github.com/modelcontextprotocol/ext-apps) > > Source code, examples, and issue tracker…

MCP Apps Model Context Protocol · in the page extensions/apps/overview …interactive map where users click regions to drill down, hover for details, and toggle between metrics, all without additional prompts. **Configuring with many options.** Setting up a deployment inv…

Enterprise-Managed Authorization Model Context Protocol · in the page extensions/auth/enterprise-managed-authorization …y gaps: * Employees shouldn't need to understand the authorization details of every MCP server their organization uses * Security teams can't enforce consistent access policies if each user authorize…

Extension Support Matrix Model Context Protocol · in the page extensions/client-matrix …s://modelcontextprotocol.io/extensions/overview.md#negotiation) for details on the capability negotiation mechanism.

Extensions Overview Model Context Protocol · in the page extensions/overview …owed, who approves them, and what implementers can expect. For full details, see [SEP-3392: Extension Lifecycle](https://modelcontextprotocol.io/seps/3392-extension-lifecycle.md). | Stage | Protocol…

Tasks Model Context Protocol · in the page extensions/tasks/overview …| A JSON-RPC error occurred during execution. The `error` field has details. | | `cancelled` | The operation was cancelled (not always honored). | `completed`, `failed`, and `cancelled` are terminal…

The MCP Registry Model Context Protocol · in the page registry/about …namespace, providing trust and accountability in the ecosystem. For details on authentication methods, see the [Authentication guide](https://modelcontextprotocol.io/registry/authentication.md). ###…

How to Authenticate When Publishing to the Official MCP Registry Model Context Protocol · in the page registry/authentication …record PUBLIC_KEY="$(openssl pkey -in key.pem -pubout -outform DER | tail -c 32 | base64)" echo "${MY_DOMAIN}. IN TXT \"v=MCPv1; k=ed25519; p=${PUBLIC_KEY}\"" ``` ```bash ECDSA P-384 theme={null} MY…

Official MCP Registry Terms of Service Model Context Protocol · in the page registry/terms-of-service …d to provide certain information (such as identification or contact details) as part of a registration process or in connection with your access or use of the Registry or MCP servers therein. Any info…

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 …semantics of any new protocol feature. The specification should be detailed enough to allow competing, interoperable implementations. A PR with the changes to the specification should be provided.*…

SEP-1577: Sampling With Tools Model Context Protocol · in the page seps/1577--sampling-with-tools …change / could be entirely done by the client as an implementation detail of their sampling support. The end user would allowlist tools from any other MCP server for use in a sampling request, witho…

SEP-1686: Tasks Model Context Protocol · in the page seps/1686-tasks …github.com/modelcontextprotocol/modelcontextprotocol/pull/1732) for details. ### 3. Protocol Messages #### 3.1. Creating Tasks To create a task, requestors send a request with the `modelcontextprot…

SEP-1730: SDKs Tiering System Model Context Protocol · in the page seps/1730-sdks-tiering-system …st undergo conformance testing using protocol trace validation: for details see [Conformance Testing RFC (forthcoming)](https://github.com/modelcontextprotocol/modelcontextprotocol/issues/1627). This…

SEP-2127: MCP Server Cards - HTTP Server Discovery Model Context Protocol · in the page seps/2127-mcp-server-cards …r Card** extension and names its Working Group and maintainers. The detailed, normative wire format — the Server Card schema, field definitions, the discovery mechanics, and the full security analysis…

SEP-2133: Extensions Model Context Protocol · in the page seps/2133-extensions …y to get some initial extension structure off the ground and defers detailed technical discussion around more complex/debatable aspects of extensions. ## Rationale This design for extensions uses th…

SEP-2148: MCP Contributor Ladder Model Context Protocol · in the page seps/2148-contributor-ladder …ect-wide implications, or when explicitly required by process. The detailed escalation procedure for Working Group and Interest Group disputes — including the designation of a Core Maintainer without…

SEP-2149: MCP Group Governance and Charter Template Model Context Protocol · in the page seps/2149-working-group-charter-template …n This template is adapted from Kubernetes governance structures and tailored for MCP's specific needs identified through community interviews. ## Backward Compatibility ### Transition for Existing…

SEP-2322: Multi Round-Trip Requests Model Context Protocol · in the page seps/2322-MRTR …ending in parallel (e.g., a tool list or even another tool call). <details> <summary>Click to expand Example Flow for Ephemeral Tools</summary> **Example Flow for Ephemeral Tools** Note: This…

SEP-2575: Make MCP Stateless Model Context Protocol · in the page seps/2575-stateless-mcp …equests. */ supportedVersions: string[]; /** * An object detailing the capabilities of the server. */ capabilities: ServerCapabilities; /** * Information about the server softwar…

SEP-2663: Tasks Extension Model Context Protocol · in the page seps/2663-tasks-extension …atus * - Additional information for "failed" status (e.g., error details, what went wrong) * * This MAY be exposed to the end-user or model. */ statusMessage?: string; /** ISO 8601 ti…

SEP-3398: Release Cycle Updates Model Context Protocol · in the page seps/3398-release-cycle-updates …e remaining specification proceeds on schedule. Security-sensitive details follow the existing [security reporting and disclosure process](https://modelcontextprotocol.io/community/security.md). Keep…

Overview Model Context Protocol · in the page specification/2024-11-05/basic/index …t exactly the features they need. See the following pages for more details on the different components: > [card] [Lifecycle](https://modelcontextprotocol.io/specification/2024-11-05/basic/lifecycle.…

Lifecycle Model Context Protocol · in the page specification/2024-11-05/basic/lifecycle …bility * Exchange and negotiate capabilities * Share implementation details The client **MUST** initiate this phase by sending an `initialize` request containing: * Protocol version supported * Clie…

Specification Model Context Protocol · in the page specification/2024-11-05/index …al context and tools into the ecosystem of AI applications. ## Key Details ### Base Protocol * [JSON-RPC](https://www.jsonrpc.org/) message format * Stateful connections * Server and client capabil…

Overview Model Context Protocol · in the page specification/2024-11-05/server/index …POST requests, file writing | Explore these key primitives in more detail below: > [card] [Prompts](https://modelcontextprotocol.io/specification/2024-11-05/server/prompts.md) > [card] [Resources](…