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Architecture overview Model Context Protocol · in the page docs/2025-11-25/learn/architecture …ing transport-specific connection establishment, message framing, and authorization. Conceptually the data layer is the inner layer, while the transport layer is the outer layer. #### Data layer Th… Understanding MCP clients Model Context Protocol · in the page docs/2025-11-25/learn/client-concepts …ovide several features to servers. These client features allow server authors to build richer interactions. | Feature | Explanation | Example | | - | - | - | | **Elicitation** | Elicitation enables s… Understanding MCP servers Model Context Protocol · in the page docs/2025-11-25/learn/server-concepts …## Prompts Prompts provide reusable templates. They allow MCP server authors to provide parameterized prompts for a domain, or showcase how to best use the MCP server. #### How Prompts Work Prompts… Security Best Practices Model Context Protocol · in the page docs/2025-11-25/tutorials/security/security_best_practices …erations for the Model Context Protocol (MCP), complementing the [MCP Authorization](https://modelcontextprotocol.io/specification/2025-11-25/basic/authorization.md) specification. This document ident… Client Best Practices Model Context Protocol · in the page docs/2026-07-28/develop/clients/client-best-practices …handle the unstructured output downstream. The real fix is for server authors to provide `outputSchema`. * **Extract a typed result using a fast model**, for single-shot calls outside loops. Expose a… Connect to remote MCP Servers Model Context Protocol · in the page docs/2026-07-28/develop/connect-remote-servers …settings. This ensures Claude only performs actions you've explicitly authorized.  > > The OAuth flow end to end, mi… CLI client Model Context Protocol · in the page docs/2026-07-28/tools/inspector/cli …e). | | `3` | Server requires authentication (HTTP 401/403, or an SDK authorization error). | | `4` | Server unreachable (DNS, connection refused, timeout, `fetch failed`). | | `5` | Tool error: `tool… Configuration and flags Model Context Protocol · in the page docs/2026-07-28/tools/inspector/configuration …-url <url>` | `MCP_OAUTH_CALLBACK_URL` | The redirect URI sent to the authorization server. Default `http://127.0.0.1:6276/oauth/callback`. Must be a loopback host (`localhost`, `127.0.0.1` or any oth… mcpdo connection client Model Context Protocol · in the page docs/2026-07-28/tools/inspector/mcpdo …rver ``` `mcpdo help`, or `mcpdo <command> --help`, prints the full, authoritative list of commands and flags. ## Choosing what to connect `connect` takes a catalog entry name or an ad-hoc target:… Recipes Model Context Protocol · in the page docs/2026-07-28/tools/inspector/recipes …`http` (Streamable HTTP) and `sse`. If the server is protected, see [Authorization](https://modelcontextprotocol.io/docs/2026-07-28/tools/inspector/authorization.md): no setup is needed in advance, b… Security Model Context Protocol · in the page docs/2026-07-28/tools/inspector/security …cret-store-variables), and IdP session tokens from enterprise-managed authorization; * each server's OAuth client secret, and the enterprise IdP client secret; * dynamically registered client secrets… TUI client Model Context Protocol · in the page docs/2026-07-28/tools/inspector/tui …binding reference, including the keys specific to the active tab. ## Authorizing an HTTP server 1. Select an HTTP or SSE server and press **`c`** to connect. 2. If the server requires authorization,… Web client Model Context Protocol · in the page docs/2026-07-28/tools/inspector/web …d), **Request refresh token**, **Revoke tokens on clear**, additional authorization parameters, authorization and token URL overrides, and **Insufficient-scope response**, which decides whether a `403… Local Server Security Model Context Protocol · in the page docs/2026-07-28/tutorials/security/local-server-security …ling, session hijacking, and confused deputy attacks. For those, see [Authorization](https://modelcontextprotocol.io/docs/2026-07-28/tutorials/security/authorization.md) and [Security Best Practices](… Security Best Practices Model Context Protocol · in the page docs/2026-07-28/tutorials/security/security_best_practices …erations for the Model Context Protocol (MCP), complementing the [MCP Authorization](https://modelcontextprotocol.io/specification/latest/basic/authorization.md) specification. This document identifie… Client Best Practices Model Context Protocol · in the page docs/draft/develop/clients/client-best-practices …handle the unstructured output downstream. The real fix is for server authors to provide `outputSchema`. * **Extract a typed result using a fast model**, for single-shot calls outside loops. Expose a… Connect to remote MCP Servers Model Context Protocol · in the page docs/draft/develop/connect-remote-servers …settings. This ensures Claude only performs actions you've explicitly authorized.  > > The OAuth flow end to end, mid-ses… CLI client Model Context Protocol · in the page docs/draft/tools/inspector/cli …e). | | `3` | Server requires authentication (HTTP 401/403, or an SDK authorization error). | | `4` | Server unreachable (DNS, connection refused, timeout, `fetch failed`). | | `5` | Tool error: `tool… Configuration and flags Model Context Protocol · in the page docs/draft/tools/inspector/configuration …-url <url>` | `MCP_OAUTH_CALLBACK_URL` | The redirect URI sent to the authorization server. Default `http://127.0.0.1:6276/oauth/callback`. Must be a loopback host (`localhost`, `127.0.0.1` or any oth… mcpdo connection client Model Context Protocol · in the page docs/draft/tools/inspector/mcpdo …rver ``` `mcpdo help`, or `mcpdo <command> --help`, prints the full, authoritative list of commands and flags. ## Choosing what to connect `connect` takes a catalog entry name or an ad-hoc target:… Recipes Model Context Protocol · in the page docs/draft/tools/inspector/recipes …`http` (Streamable HTTP) and `sse`. If the server is protected, see [Authorization](https://modelcontextprotocol.io/docs/draft/tools/inspector/authorization.md): no setup is needed in advance, becaus… Security Model Context Protocol · in the page docs/draft/tools/inspector/security …cret-store-variables), and IdP session tokens from enterprise-managed authorization; * each server's OAuth client secret, and the enterprise IdP client secret; * dynamically registered client secrets… TUI client Model Context Protocol · in the page docs/draft/tools/inspector/tui …binding reference, including the keys specific to the active tab. ## Authorizing an HTTP server 1. Select an HTTP or SSE server and press **`c`** to connect. 2. If the server requires authorization,… Web client Model Context Protocol · in the page docs/draft/tools/inspector/web …d), **Request refresh token**, **Revoke tokens on clear**, additional authorization parameters, authorization and token URL overrides, and **Insufficient-scope response**, which decides whether a `403… Local Server Security Model Context Protocol · in the page docs/draft/tutorials/security/local-server-security …ling, session hijacking, and confused deputy attacks. For those, see [Authorization](https://modelcontextprotocol.io/docs/draft/tutorials/security/authorization.md) and [Security Best Practices](https… Security Best Practices Model Context Protocol · in the page docs/draft/tutorials/security/security_best_practices …erations for the Model Context Protocol (MCP), complementing the [MCP Authorization](https://modelcontextprotocol.io/specification/latest/basic/authorization.md) specification. This document identifie… MCP Apps Model Context Protocol · in the page extensions/apps/overview …osts can safely render third-party apps without trusting the server author completely. If your use case doesn't benefit from these properties, a regular web app might be simpler. But if you want ti… OAuth Client Credentials Model Context Protocol · in the page extensions/auth/oauth-client-credentials …automated systems to connect to MCP servers without interactive user authorization. > [card] [Specification](https://github.com/modelcontextprotocol/ext-auth/blob/main/specification/stable/oauth-cli… Extension Support Matrix Model Context Protocol · in the page extensions/client-matrix …o-machine auth without interactive user login | | [Enterprise-Managed Authorization](https://modelcontextprotocol.io/extensions/auth/enterprise-managed-authorization.md) | `io.modelcontextprotocol/ent… Extensions Overview Model Context Protocol · in the page extensions/overview …ecification or have ended move to `specification/archived/`. ### MCP Authorization Extensions > [card] [modelcontextprotocol/ext-auth](https://github.com/modelcontextprotocol/ext-auth) > > Extension… How to Authenticate When Publishing to the Official MCP Registry Model Context Protocol · in the page registry/authentication …1. Go to: https://github.com/login/device 2. Enter code: ABCD-1234 3. Authorize this application Waiting for authorization... ``` Visit the link, follow the prompts, and enter the authorization code… MCP Registry Supported Package Types Model Context Protocol · in the page registry/package-types …le above intentionally omits `runtimeHint` for this reason. Rust MCP authors have two first-class distribution paths: * **Cargo (`registryType: cargo`)** — source-distributed via crates.io. End user… Quickstart: Publish an MCP Server to the MCP Registry Model Context Protocol · in the page registry/quickstart …1. Go to: https://github.com/login/device 2. Enter code: ABCD-1234 3. Authorize this application Waiting for authorization... ``` Visit the link, follow the prompts, and enter the authorization code… Official MCP Registry Terms of Service Model Context Protocol · in the page registry/terms-of-service …istry on behalf of an entity, you represent and warrant that you have authority to bind that entity to these Terms. By accepting these Terms, you are doing so on behalf of that entity (and all referen… SEP-1024: MCP Client Security Requirements for Local Server Installation Model Context Protocol · in the page seps/1024-mcp-client-security-requirements-for-local-server- …odelcontextprotocol.io/specification/latest.md) and its changelog for authoritative > requirements. | Field | Value | | - | - | | **SEP** | 1024 | | **Title** | MCP Client Security Requirements for L… 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 …odelcontextprotocol.io/specification/latest.md) and its changelog for authoritative > requirements. | Field | Value | | - | - | | **SEP** | 1034 | | **Title** | Support default values for all primiti… SEP-1036: URL Mode Elicitation for secure out-of-band interactions Model Context Protocol · in the page seps/1036-url-mode-elicitation-for-secure-out-of-band-intera …odelcontextprotocol.io/specification/latest.md) and its changelog for authoritative > requirements. | Field | Value | | - | - | | **SEP** | 1036 | | **Title** | URL Mode Elicitation for secure out-of… 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 …odelcontextprotocol.io/specification/latest.md) and its changelog for authoritative > requirements. | Field | Value | | - | - | | **SEP** | 1302 | | **Title** | Formalize Working Groups and Interest… SEP-1303: Input Validation Errors as Tool Execution Errors Model Context Protocol · in the page seps/1303-input-validation-errors-as-tool-execution-errors …odelcontextprotocol.io/specification/latest.md) and its changelog for authoritative > requirements. | Field | Value | | - | - | | **SEP** | 1303 | | **Title** | Input Validation Errors as Tool Execut… SEP-1319: Decouple Request Payload from RPC Methods Definition Model Context Protocol · in the page seps/1319-decouple-request-payload-from-rpc-methods-definiti …odelcontextprotocol.io/specification/latest.md) and its changelog for authoritative > requirements. | Field | Value | | - | - | | **SEP** | 1319 | | **Title** | Decouple Request Payload from RPC Meth… SEP-1330: Elicitation Enum Schema Improvements and Standards Compliance Model Context Protocol · in the page seps/1330-elicitation-enum-schema-improvements-and-standards …odelcontextprotocol.io/specification/latest.md) and its changelog for authoritative > requirements. | Field | Value | | - | - | | **SEP** | 1330 | | **Title** | Elicitation Enum Schema Improvements a… SEP-1577: Sampling With Tools Model Context Protocol · in the page seps/1577--sampling-with-tools …odelcontextprotocol.io/specification/latest.md) and its changelog for authoritative > requirements. | Field | Value | | - | - | | **SEP** | 1577 | | **Title** | Sampling With Tools | | **Status** | F…