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Security Best Practices Model Context Protocol · in the page docs/2025-11-25/tutorials/security/security_best_practices …d IP range restrictions to redirect destinations * Consider disabling automatic redirect following and validating each hop **Use Egress Proxies** For server-side MCP client deployments, operators… Build an MCP client Model Context Protocol · in the page docs/2026-07-28/develop/build-client …erface * Implement rich console output * Add command history or auto-completion ## Running the Client To run your client with any MCP server: ```bash theme={null} uv run client.py path/to/ser… Build an MCP server Model Context Protocol · in the page docs/2026-07-28/develop/build-server …/mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/current-weather.png?fit=max\&auto=format\&n=4ZXF1PrDkEaJvXpn\&q=85\&s=dce7b2f8a06c20ba358e4bd2e75fa4c7) > [!NOTE] > > Servers can connect to any client. We've… Client Best Practices Model Context Protocol · in the page docs/2026-07-28/develop/clients/client-best-practices …dn.com/mcp/JXfd5cBmEUh_qPUI/images/progressive-discovery.svg?fit=max\&auto=format\&n=JXfd5cBmEUh_qPUI\&q=85\&s=db39f47006107f04af43b5eeae2d6022) Progressive discovery avoids this: * The host fetches… Connect to local MCP servers Model Context Protocol · in the page docs/2026-07-28/develop/connect-local-servers …dn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-filesystem.png?fit=max\&auto=format\&n=4ZXF1PrDkEaJvXpn\&q=85\&s=629d7e754dc358d71a408d6ce970c1b1) ## Prerequisites Before starting this tutorial, ensur… Connect to remote MCP Servers Model Context Protocol · in the page docs/2026-07-28/develop/connect-remote-servers …XzQjUOzyH0mCNH/images/claude-desktop-hamburger-menu-icon.png?fit=max\&auto=format\&n=cpXzQjUOzyH0mCNH\&q=85\&s=66e498f668362c79f829a07b5ce863c8), hover over "File", and select "Settings" * **Browser**… What is the Model Context Protocol (MCP)? Model Context Protocol · in the page docs/2026-07-28/getting-started/intro …ntcdn.com/mcp/bEUxYpZqie0DsluH/images/mcp-simple-diagram.png?fit=max\&auto=format\&n=bEUxYpZqie0DsluH\&q=85\&s=35268aa0ad50b8c385913810e7604550) ## What can MCP enable? * Agents can access your Goog… Architecture overview Model Context Protocol · in the page docs/2026-07-28/learn/architecture …ss. This allows the LLM to understand what actions it can perform and automatically generates the appropriate tool calls during conversations. ```python Pseudo-code for AI application tool discovery… Understanding MCP clients Model Context Protocol · in the page docs/2026-07-28/learn/client-concepts …ractions are designed to be clear, contextual, and respectful of user autonomy: **Request presentation**: Clients display elicitation requests with clear context about which server is asking, why the… Understanding MCP servers Model Context Protocol · in the page docs/2026-07-28/learn/server-concepts …"[email protected]", subject: "Out of Office", body: "...") ``` Sends an automated out-of-office message to colleagues. #### User Interaction Model Tools are model-controlled, meaning AI models can dis… Debugging Model Context Protocol · in the page docs/2026-07-28/tools/debugging …d to stderr (standard error) will be captured by the host application automatically. > [!WARNING] > > Local MCP servers should not log messages to stdout (standard out), as this > will interfere with… MCP Inspector Model Context Protocol · in the page docs/2026-07-28/tools/inspector …cp/pUebPdrb6PY5_mfH/images/inspector/web-monitor-sidebar.png?fit=max\&auto=format\&n=pUebPdrb6PY5_mfH\&q=85\&s=2ced9eeefa020be53fe4fe957b7d07c6) The MCP Inspector web client after a tool call, with t… Authorization Model Context Protocol · in the page docs/2026-07-28/tools/inspector/authorization …](#mid-session-re-authorization), the CLI retries the refused request automatically, and the web client asks you to retry the action.  to negotiate. | Requires an ad-hoc targe… mcpdo connection client Model Context Protocol · in the page docs/2026-07-28/tools/inspector/mcpdo …ser sign-in is needed and neither stdin nor stderr is a TTY (and `MCP_AUTO_OPEN_ENABLED` is not forced on), `connect` exits `0` immediately with `pendingAuth: true` and an `authUrl`. Relay that URL to… Protocol eras Model Context Protocol · in the page docs/2026-07-28/tools/inspector/protocol-eras …tocol Era` setting Each server carries a `protocolEra` of `legacy`, `auto`, or `modern`. In the web client it lives in **Server Settings**; in a catalog or config file it is the `protocolEra` field;… Recipes Model Context Protocol · in the page docs/2026-07-28/tools/inspector/recipes …nspector/protocol-eras.md). The default is `legacy`; set `modern` or `auto` in Server Settings (or `protocolEra` in the catalog file) to exercise the 2026-07-28 behavior. For an ad-hoc target, pass it… Security Model Context Protocol · in the page docs/2026-07-28/tools/inspector/security …t is **plaintext unless you supply a key**, and that fallback happens automatically. * **stdio servers run as you.** Anything the Inspector can read, a server it starts can usually read too. * **The m… TUI client Model Context Protocol · in the page docs/2026-07-28/tools/inspector/tui …tcdn.com/mcp/gk28X8wi_tbRYzej/images/inspector/tui-tools.png?fit=max\&auto=format\&n=gk28X8wi_tbRYzej\&q=85\&s=5d11d64f4b98df8c26e7ac048f38576f) The TUI connected to a server, on the Tools tab, showi… Web client Model Context Protocol · in the page docs/2026-07-28/tools/inspector/web …dn.com/mcp/gk28X8wi_tbRYzej/images/inspector/web-tab-bar.png?fit=max\&auto=format\&n=gk28X8wi_tbRYzej\&q=85\&s=04bb61c4a45ff12e8337c701e195c386) The tab bar on a connected server. Which tabs appear d… Understanding Authorization in MCP Model Context Protocol · in the page docs/2026-07-28/tutorials/security/authorization …O-cEUqgzn/images/tutorial-authorization/keycloak-browser.png?fit=max\&auto=format\&n=sAd4SGUO-cEUqgzn\&q=85\&s=cba689d986e113cbe937d732ac0558b6) When running with the default configuration, Keycloak… Local Server Security Model Context Protocol · in the page docs/2026-07-28/tutorials/security/local-server-security …mpromised future release does not walk onto your machine through an auto-update. Pair the pin with a deliberate update habit: when a security advisory lands for something you pinned, the pin is wh… Security Best Practices Model Context Protocol · in the page docs/2026-07-28/tutorials/security/security_best_practices …d IP range restrictions to redirect destinations * Consider disabling automatic redirect following and validating each hop **Use Egress Proxies** For server-side MCP client deployments, operators… Build an MCP client Model Context Protocol · in the page docs/draft/develop/build-client …erface * Implement rich console output * Add command history or auto-completion ## Running the Client To run your client with any MCP server: ```bash theme={null} uv run client.py path/to/ser… Build an MCP server Model Context Protocol · in the page docs/draft/develop/build-server …/mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/current-weather.png?fit=max\&auto=format\&n=4ZXF1PrDkEaJvXpn\&q=85\&s=dce7b2f8a06c20ba358e4bd2e75fa4c7) > [!NOTE] > > Servers can connect to any client. We've… Client Best Practices Model Context Protocol · in the page docs/draft/develop/clients/client-best-practices …dn.com/mcp/JXfd5cBmEUh_qPUI/images/progressive-discovery.svg?fit=max\&auto=format\&n=JXfd5cBmEUh_qPUI\&q=85\&s=db39f47006107f04af43b5eeae2d6022) Progressive discovery avoids this: * The host fetches… Connect to local MCP servers Model Context Protocol · in the page docs/draft/develop/connect-local-servers …dn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-filesystem.png?fit=max\&auto=format\&n=4ZXF1PrDkEaJvXpn\&q=85\&s=629d7e754dc358d71a408d6ce970c1b1) ## Prerequisites Before starting this tutorial, ensur… Connect to remote MCP Servers Model Context Protocol · in the page docs/draft/develop/connect-remote-servers …XzQjUOzyH0mCNH/images/claude-desktop-hamburger-menu-icon.png?fit=max\&auto=format\&n=cpXzQjUOzyH0mCNH\&q=85\&s=66e498f668362c79f829a07b5ce863c8), hover over "File", and select "Settings" * **Browser**… What is the Model Context Protocol (MCP)? Model Context Protocol · in the page docs/draft/getting-started/intro …ntcdn.com/mcp/bEUxYpZqie0DsluH/images/mcp-simple-diagram.png?fit=max\&auto=format\&n=bEUxYpZqie0DsluH\&q=85\&s=35268aa0ad50b8c385913810e7604550) ## What can MCP enable? * Agents can access your Goog… Architecture overview Model Context Protocol · in the page docs/draft/learn/architecture …ss. This allows the LLM to understand what actions it can perform and automatically generates the appropriate tool calls during conversations. ```python Pseudo-code for AI application tool discovery… Understanding MCP clients Model Context Protocol · in the page docs/draft/learn/client-concepts …ractions are designed to be clear, contextual, and respectful of user autonomy: **Request presentation**: Clients display elicitation requests with clear context about which server is asking, why the… Understanding MCP servers Model Context Protocol · in the page docs/draft/learn/server-concepts …"[email protected]", subject: "Out of Office", body: "...") ``` Sends an automated out-of-office message to colleagues. #### User Interaction Model Tools are model-controlled, meaning AI models can dis… Debugging Model Context Protocol · in the page docs/draft/tools/debugging …d to stderr (standard error) will be captured by the host application automatically. > [!WARNING] > > Local MCP servers should not log messages to stdout (standard out), as this > will interfere with… MCP Inspector Model Context Protocol · in the page docs/draft/tools/inspector …cp/pUebPdrb6PY5_mfH/images/inspector/web-monitor-sidebar.png?fit=max\&auto=format\&n=pUebPdrb6PY5_mfH\&q=85\&s=2ced9eeefa020be53fe4fe957b7d07c6) The MCP Inspector web client after a tool call, with t… Authorization Model Context Protocol · in the page docs/draft/tools/inspector/authorization …](#mid-session-re-authorization), the CLI retries the refused request automatically, and the web client asks you to retry the action.  to negotiate. | Requires an ad-hoc target on… mcpdo connection client Model Context Protocol · in the page docs/draft/tools/inspector/mcpdo …ser sign-in is needed and neither stdin nor stderr is a TTY (and `MCP_AUTO_OPEN_ENABLED` is not forced on), `connect` exits `0` immediately with `pendingAuth: true` and an `authUrl`. Relay that URL to… Protocol eras Model Context Protocol · in the page docs/draft/tools/inspector/protocol-eras …tocol Era` setting Each server carries a `protocolEra` of `legacy`, `auto`, or `modern`. In the web client it lives in **Server Settings**; in a catalog or config file it is the `protocolEra` field;… Recipes Model Context Protocol · in the page docs/draft/tools/inspector/recipes …nspector/protocol-eras.md). The default is `legacy`; set `modern` or `auto` in Server Settings (or `protocolEra` in the catalog file) to exercise the 2026-07-28 behavior. For an ad-hoc target, pass it… Security Model Context Protocol · in the page docs/draft/tools/inspector/security …t is **plaintext unless you supply a key**, and that fallback happens automatically. * **stdio servers run as you.** Anything the Inspector can read, a server it starts can usually read too. * **The m… TUI client Model Context Protocol · in the page docs/draft/tools/inspector/tui …tcdn.com/mcp/gk28X8wi_tbRYzej/images/inspector/tui-tools.png?fit=max\&auto=format\&n=gk28X8wi_tbRYzej\&q=85\&s=5d11d64f4b98df8c26e7ac048f38576f) The TUI connected to a server, on the Tools tab, showi… Web client Model Context Protocol · in the page docs/draft/tools/inspector/web …dn.com/mcp/gk28X8wi_tbRYzej/images/inspector/web-tab-bar.png?fit=max\&auto=format\&n=gk28X8wi_tbRYzej\&q=85\&s=04bb61c4a45ff12e8337c701e195c386) The tab bar on a connected server. Which tabs appear d… Understanding Authorization in MCP Model Context Protocol · in the page docs/draft/tutorials/security/authorization …O-cEUqgzn/images/tutorial-authorization/keycloak-browser.png?fit=max\&auto=format\&n=sAd4SGUO-cEUqgzn\&q=85\&s=cba689d986e113cbe937d732ac0558b6) When running with the default configuration, Keycloak… Local Server Security Model Context Protocol · in the page docs/draft/tutorials/security/local-server-security …mpromised future release does not walk onto your machine through an auto-update. Pair the pin with a deliberate update habit: when a security advisory lands for something you pinned, the pin is wh… Security Best Practices Model Context Protocol · in the page docs/draft/tutorials/security/security_best_practices …d IP range restrictions to redirect destinations * Consider disabling automatic redirect following and validating each hop **Use Egress Proxies** For server-side MCP client deployments, operators… MCP Apps Model Context Protocol · in the page extensions/apps/overview …and-forth conversation ("Which region?" "What instance size?" "Enable autoscaling?"), an MCP App presents a form where users see all options at once, with validation and defaults. **Viewing rich medi… OAuth Client Credentials Model Context Protocol · in the page extensions/auth/oauth-client-credentials …tatracker.ietf.org/doc/html/rfc6749#section-4.4) to MCP. This enables automated systems to connect to MCP servers without interactive user authorization. > **[Specification](https://github.com/modelc… Authorization Extensions Model Context Protocol · in the page extensions/auth/overview …on't have a human in the loop. Background services, CI pipelines, and automated workflows need to authenticate without interactive user consent flows. * **Enterprise environments** often have centrali…