1,081 pages for value.
Titles and paths first, then pages whose text carries it. Each row opens that page as this site last read it.
Understanding Authorization in MCP
Model Context Protocol · in the page
docs/2025-03-26/tutorials/security/authorization
…c397f4c79c491c2e39019272) For **Name**, use `audience-config`. Add a value for **Included Custom Audience**, set to `http://localhost:3000`. This will be the URI of our test server. > [!WARNING] > >…
Security Best Practices
Model Context Protocol · in the page
docs/2025-03-26/tutorials/security/security_best_practices
…MCP server acting as a client to the Third-Party API. It is the same value for all MCP server to Third-Party API interactions regardless of which MCP client initiated the request. #### Vulnerable Co…
Build an MCP client
Model Context Protocol · in the page
docs/2025-06-18/develop/build-client
…t_path.endswith('.js') if not (is_python or is_js): raise ValueError("Server script must be a .py or .js file") command = "python" if is_python else "node" server_params = StdioSe…
Build an MCP server
Model Context Protocol · in the page
docs/2025-06-18/develop/build-server
…; client.DefaultRequestHeaders.UserAgent.Add(new ProductInfoHeaderValue("weather-tool", "1.0")); return client; }); var app = builder.Build(); await app.RunAsync(); ``` > [!NOTE] > > When c…
Client Best Practices
Model Context Protocol · in the page
docs/2025-06-18/develop/clients/client-best-practices
…for single-shot calls outside loops. Expose a host-brokered `extract(value, ExpectedType)` helper through the same stub-interception path as MCP tool calls so the sandbox itself never opens a network…
Connect to local MCP servers
Model Context Protocol · in the page
docs/2025-06-18/develop/connect-local-servers
…rring to `${APPDATA}` within a path, you may need to add the expanded value of `%APPDATA%` to your `env` key in `claude_desktop_config.json`: > > ```json theme={null} > { > "brave-search": { > "…
Understanding MCP servers
Model Context Protocol · in the page
docs/2025-06-18/learn/server-concepts
…JFK - John F. Kennedy International" The system helps discover valid values without requiring exact format knowledge. #### User Interaction Model Resources are application-driven, giving them flexi…
Debugging
Model Context Protocol · in the page
docs/2025-06-18/tools/debugging
…Problems** * Missing environment variables * Incorrect variable values * Permission restrictions ### Connection problems When servers fail to connect: 1. Check client logs 2. Verify server…
Understanding Authorization in MCP
Model Context Protocol · in the page
docs/2025-06-18/tutorials/security/authorization
…c397f4c79c491c2e39019272) For **Name**, use `audience-config`. Add a value for **Included Custom Audience**, set to `http://localhost:3000`. This will be the URI of our test server. > [!WARNING] > >…
Security Best Practices
Model Context Protocol · in the page
docs/2025-06-18/tutorials/security/security_best_practices
…MCP server acting as a client to the Third-Party API. It is the same value for all MCP server to Third-Party API interactions regardless of which MCP client initiated the request. #### Vulnerable Co…
Build an MCP client
Model Context Protocol · in the page
docs/2025-11-25/develop/build-client
…t_path.endswith('.js') if not (is_python or is_js): raise ValueError("Server script must be a .py or .js file") command = "python" if is_python else "node" server_params = StdioSe…
Build an MCP server
Model Context Protocol · in the page
docs/2025-11-25/develop/build-server
…; client.DefaultRequestHeaders.UserAgent.Add(new ProductInfoHeaderValue("weather-tool", "1.0")); return client; }); var app = builder.Build(); await app.RunAsync(); ``` > [!NOTE] > > When c…
Client Best Practices
Model Context Protocol · in the page
docs/2025-11-25/develop/clients/client-best-practices
…for single-shot calls outside loops. Expose a host-brokered `extract(value, ExpectedType)` helper through the same stub-interception path as MCP tool calls so the sandbox itself never opens a network…
Connect to local MCP servers
Model Context Protocol · in the page
docs/2025-11-25/develop/connect-local-servers
…rring to `${APPDATA}` within a path, you may need to add the expanded value of `%APPDATA%` to your `env` key in `claude_desktop_config.json`: > > ```json theme={null} > { > "brave-search": { > "…
Understanding MCP servers
Model Context Protocol · in the page
docs/2025-11-25/learn/server-concepts
…JFK - John F. Kennedy International" The system helps discover valid values without requiring exact format knowledge. #### User Interaction Model Resources are application-driven, giving them flexi…
Debugging
Model Context Protocol · in the page
docs/2025-11-25/tools/debugging
…Problems** * Missing environment variables * Incorrect variable values * Permission restrictions ### Connection problems When servers fail to connect: 1. Check client logs 2. Verify server…
Understanding Authorization in MCP
Model Context Protocol · in the page
docs/2025-11-25/tutorials/security/authorization
…c397f4c79c491c2e39019272) For **Name**, use `audience-config`. Add a value for **Included Custom Audience**, set to `http://localhost:3000`. This will be the URI of our test server. > [!WARNING] > >…
Security Best Practices
Model Context Protocol · in the page
docs/2025-11-25/tutorials/security/security_best_practices
…MCP server acting as a client to the Third-Party API. It is the same value for all MCP server to Third-Party API interactions regardless of which MCP client initiated the request. #### Vulnerable Co…
Build an MCP client
Model Context Protocol · in the page
docs/2026-07-28/develop/build-client
…ath.endswith(".js"): command = "node" else: raise ValueError("Server script must be a .py or .js file") return StdioServerParameters(command=command, args=[server_script_path]…
Build an MCP server
Model Context Protocol · in the page
docs/2026-07-28/develop/build-server
…; client.DefaultRequestHeaders.UserAgent.Add(new ProductInfoHeaderValue("weather-tool", "1.0")); return client; }); var app = builder.Build(); await app.RunAsync(); ``` > [!NOTE] > > When c…
Client Best Practices
Model Context Protocol · in the page
docs/2026-07-28/develop/clients/client-best-practices
…for single-shot calls outside loops. Expose a host-brokered `extract(value, ExpectedType)` helper through the same stub-interception path as MCP tool calls so the sandbox itself never opens a network…
Connect to local MCP servers
Model Context Protocol · in the page
docs/2026-07-28/develop/connect-local-servers
…rring to `${APPDATA}` within a path, you may need to add the expanded value of `%APPDATA%` to your `env` key in `claude_desktop_config.json`: > > ```json theme={null} > { > "brave-search": { > "…
Architecture overview
Model Context Protocol · in the page
docs/2026-07-28/learn/architecture
…ream carries `io.modelcontextprotocol/subscriptionId` in `_meta`. The value is the JSON-RPC ID of the `subscriptions/listen` request that opened the stream (`4` in this example), so clients can correl…
Understanding MCP servers
Model Context Protocol · in the page
docs/2026-07-28/learn/server-concepts
…JFK - John F. Kennedy International" The system helps discover valid values without requiring exact format knowledge. #### User Interaction Model Resources are application-driven, giving them flexi…
Versioning
Model Context Protocol · in the page
docs/2026-07-28/learn/versioning
…s or rejects each request independently. On Streamable HTTP, the same value is also carried in the [`MCP-Protocol-Version` header](/specification/2026-07-28/basic/transports/streamable-http#protocol-v…
Debugging
Model Context Protocol · in the page
docs/2026-07-28/tools/debugging
…Problems** * Missing environment variables * Incorrect variable values * Permission restrictions ### Connection problems When servers fail to connect: 1. Check client logs 2. Verify server…
MCP Inspector
Model Context Protocol · in the page
docs/2026-07-28/tools/inspector
…tores secrets (OAuth tokens, OAuth client secrets, and stdio > `env:` values) in the OS keychain when one is available.** On a machine with > no keychain (Linux without libsecret or a Secret Service,…
Authorization
Model Context Protocol · in the page
docs/2026-07-28/tools/inspector/authorization
…k` | The main app server already has an HTTP listener. Copy the exact value from the **Redirect URI** field in Server Settings. | | **CLI** | `http://127.0.0.1:6276/oauth/callback` | A dedicated loopb…
CLI client
Model Context Protocol · in the page
docs/2026-07-28/tools/inspector/cli
…t hold a stream open. ### Passing arguments `--tool-arg` takes `key=value` and **coerces** each value by JSON-parsing it when it parses, so `count=1` and `zip=10001` both send numbers. A value that…
Configuration and flags
Model Context Protocol · in the page
docs/2026-07-28/tools/inspector/configuration
…` | Working directory for a stdio server process. | None | | `-e <KEY=VALUE>` | Environment variables for a stdio server. Repeatable. | None | | `--header "Name: Value"` | HTTP headers for an HTTP/SSE…
mcpdo connection client
Model Context Protocol · in the page
docs/2026-07-28/tools/inspector/mcpdo
…tation/respond <elicitationId> approved:=true # form fields as key:=value or JSON mcpdo elicitation/respond <elicitationId> --done # URL mode: I finished mcpdo elicitation/respond <elicita…
Protocol eras
Model Context Protocol · in the page
docs/2026-07-28/tools/inspector/protocol-eras
…cp-header`, asking a Streamable HTTP client to mirror that argument's value into an `Mcp-Param-*` request header. The Inspector surfaces both halves of that contract in the **Tools** tab: * A tool w…
Recipes
Model Context Protocol · in the page
docs/2026-07-28/tools/inspector/recipes
…Poll these attributes instead of sleeping: | Selector | Attribute | Values | | - | - | - | | `[data-testid="apps-form"]` | `data-app-status` | `idle`, then `loading`, then `ready` or `error` (on `er…
Security
Model Context Protocol · in the page
docs/2026-07-28/tools/inspector/security
…he token, which is why the bind address matters more than the token's value. Pinning your own `MCP_INSPECTOR_API_TOKEN` does not change this, since a custom token is disclosed exactly like a generated…
TUI client
Model Context Protocol · in the page
docs/2026-07-28/tools/inspector/tui
…etails pane full screen | | `y` / `w` | In a details dialog: copy the value, or save it to a file (`w` also saves a tool's result) | | `?` | Show or hide the keybinding help | | `Esc` or `Ctrl+C` | Ex…
Web client
Model Context Protocol · in the page
docs/2026-07-28/tools/inspector/web
…aved in the catalog as written; OAuth client secrets and stdio `env:` values go to the [secret store](/docs/2026-07-28/tools/inspector/configuration.md#where-secrets-are-stored). * **OAuth Settings**:…
Understanding Authorization in MCP
Model Context Protocol · in the page
docs/2026-07-28/tutorials/security/authorization
…c397f4c79c491c2e39019272) For **Name**, use `audience-config`. Add a value for **Included Custom Audience**, set to `http://localhost:3000`. This will be the URI of our test server. > [!WARNING] > >…
Security Best Practices
Model Context Protocol · in the page
docs/2026-07-28/tutorials/security/security_best_practices
…MCP server acting as a client to the Third-Party API. It is the same value for all MCP server to Third-Party API interactions regardless of which MCP client initiated the request. #### Vulnerable Co…
Build an MCP client
Model Context Protocol · in the page
docs/draft/develop/build-client
…ath.endswith(".js"): command = "node" else: raise ValueError("Server script must be a .py or .js file") return StdioServerParameters(command=command, args=[server_script_path]…
Build an MCP server
Model Context Protocol · in the page
docs/draft/develop/build-server
…; client.DefaultRequestHeaders.UserAgent.Add(new ProductInfoHeaderValue("weather-tool", "1.0")); return client; }); var app = builder.Build(); await app.RunAsync(); ``` > [!NOTE] > > When c…
Client Best Practices
Model Context Protocol · in the page
docs/draft/develop/clients/client-best-practices
…for single-shot calls outside loops. Expose a host-brokered `extract(value, ExpectedType)` helper through the same stub-interception path as MCP tool calls so the sandbox itself never opens a network…
Connect to local MCP servers
Model Context Protocol · in the page
docs/draft/develop/connect-local-servers
…rring to `${APPDATA}` within a path, you may need to add the expanded value of `%APPDATA%` to your `env` key in `claude_desktop_config.json`: > > ```json theme={null} > { > "brave-search": { > "…
Architecture overview
Model Context Protocol · in the page
docs/draft/learn/architecture
…ream carries `io.modelcontextprotocol/subscriptionId` in `_meta`. The value is the JSON-RPC ID of the `subscriptions/listen` request that opened the stream (`4` in this example), so clients can correl…
Understanding MCP servers
Model Context Protocol · in the page
docs/draft/learn/server-concepts
…JFK - John F. Kennedy International" The system helps discover valid values without requiring exact format knowledge. #### User Interaction Model Resources are application-driven, giving them flexi…
Versioning
Model Context Protocol · in the page
docs/draft/learn/versioning
…s or rejects each request independently. On Streamable HTTP, the same value is also carried in the [`MCP-Protocol-Version` header](/specification/draft/basic/transports/streamable-http#protocol-versio…
Debugging
Model Context Protocol · in the page
docs/draft/tools/debugging
…Problems** * Missing environment variables * Incorrect variable values * Permission restrictions ### Connection problems When servers fail to connect: 1. Check client logs 2. Verify server…
MCP Inspector
Model Context Protocol · in the page
docs/draft/tools/inspector
…tores secrets (OAuth tokens, OAuth client secrets, and stdio > `env:` values) in the OS keychain when one is available.** On a machine with > no keychain (Linux without libsecret or a Secret Service,…
Authorization
Model Context Protocol · in the page
docs/draft/tools/inspector/authorization
…k` | The main app server already has an HTTP listener. Copy the exact value from the **Redirect URI** field in Server Settings. | | **CLI** | `http://127.0.0.1:6276/oauth/callback` | A dedicated loopb…
CLI client
Model Context Protocol · in the page
docs/draft/tools/inspector/cli
…t hold a stream open. ### Passing arguments `--tool-arg` takes `key=value` and **coerces** each value by JSON-parsing it when it parses, so `count=1` and `zip=10001` both send numbers. A value that…
Configuration and flags
Model Context Protocol · in the page
docs/draft/tools/inspector/configuration
…` | Working directory for a stdio server process. | None | | `-e <KEY=VALUE>` | Environment variables for a stdio server. Repeatable. | None | | `--header "Name: Value"` | HTTP headers for an HTTP/SSE…