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To connect a local AI assistant to an app with MCP, use a host that supports MCP, configure a compatible MCP server for the app or data you want to use, grant it only the access it needs, then restart or reconnect the host and verify the server’s tools are available. In Claude Desktop’s documented filesystem example, the server can read and change files in configured directories and runs with your own account permissions, so choosing those directories carefully is a core part of setup.
How do I connect my local AI assistant to my apps with MCP?
MCP (Model Context Protocol) is an interface that lets an AI application communicate with a server that offers tools or data. The AI application is the host; the server provides the capabilities. A host, server, and app need to be compatible with one another—MCP does not make every assistant work with every app automatically. Google Cloud lists Claude, VS Code, Gemini CLI, and Cursor IDE as examples of hosts, not as a complete compatibility guarantee. See the Google Cloud overview of remote MCP servers and the MCP local-server guide.
- Choose the host and server. Confirm that your assistant supports MCP and that the server is intended for the app, service, or files you want it to work with.
- Check installation requirements. Follow the server publisher’s current instructions for its runtime, package, and configuration. Requirements vary by server.
- Choose local or remote access. A local server runs on your device; a remote connector reaches a server over a network. The right choice depends on where the data and service are, and what trust and network boundaries you need.
- Limit access. Grant only the directories, app permissions, credentials, or scopes needed for the task.
- Connect and verify. Restart or reconnect the host as its instructions require, then confirm the server’s tools appear. Start with a harmless read-only request before allowing changes.
How do I set up an MCP server in Claude Desktop?
Claude Desktop documents a local filesystem-server setup that uses Node.js and the app’s MCP JSON configuration. The configuration tells Claude Desktop which server command to run and which directories it may access. Consult the live MCP guide to connecting local servers for the current instructions and operating-system-specific config-file locations; paths and package details can change.
- Install the required runtime. The documented filesystem example requires Node.js. Install it using its official instructions if it is not already available.
- Open Claude Desktop’s Developer settings. Use the MCP configuration option to open or edit the JSON configuration file, following the current Claude and MCP documentation for your system.
- Configure the server narrowly. Add the server command and specify only the directories it needs. Do not copy commands or package names from an old guide without checking the server’s current instructions.
- Save and fully restart Claude Desktop. Saving the file alone is not enough for the documented manual route; quit the app completely and reopen it.
- Check the connection. Confirm the server and its tools show in Claude Desktop. Try a read-only request first, and approve any later action only when you understand what it will do.
The filesystem server can read, create, move, rename, and search files in the configured areas. It runs with the permissions of the user account that launched it. The MCP guide puts the boundary plainly: “Only grant access to directories you’re comfortable with Claude reading and modifying.”
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Can I install a local server without editing JSON?
Claude Desktop also offers desktop extensions as an installation and management route for local servers. Its extensions support servers implemented with Node.js, Python, or binaries, as well as custom .mcpb packages. Check the current app version and required settings before relying on this option; availability and setup can depend on the installation. See Anthropic’s Claude Desktop local MCP server guidance.
Do I need Node.js to use MCP?
No. MCP itself does not require Node.js. The runtime depends on the particular server and installation method: the official Claude Desktop filesystem example uses Node.js, while Claude Desktop extensions can also support Python and binary servers. Check the server’s own current requirements rather than installing a runtime simply because you are using MCP.
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Is a local MCP server different from a remote connector?
Yes. They differ in where the server runs, how the host reaches it, and which permission boundary matters. Neither route is universally safer or easier.
| Aspect | Local MCP server | Remote connector |
|---|---|---|
| Where it runs | Typically on the same device as the host. | On service infrastructure, exposed through an HTTP endpoint. |
| How it connects | Local Claude Desktop servers typically communicate through stdio. | Uses HTTP; in Claude’s remote connector flow, requests come from Anthropic’s cloud infrastructure. |
| Network reach | Designed for local access; it does not inherently make a private service reachable from elsewhere. | A server behind a VPN or firewall may need suitable reachability and firewall configuration for the cloud-originated connection. |
| Permission boundary | Actions are bounded by the server process’s operating-system account permissions and its configuration. | Access depends on connector permissions and credentials, including OAuth scopes or fixed credentials. |
| Setup route | Claude Desktop supports local desktop extensions as well as manual configuration. | Claude remote connectors are configured in connector settings. |
For an overview of the local-versus-remote distinction, see Google Cloud’s remote MCP server overview. Anthropic describes its remote connector flow and network considerations in its guidance on custom integrations using remote MCP. A local server may suit data and tools that should stay on the device, while a remote connector may suit a service that is already hosted remotely; assess the actual data flow, credentials, and access rules for your setup.
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What permissions does an MCP server get?
An MCP server can act through the access available to it. For a local process, that means the operating-system permissions of the account running it, constrained by the server’s own configuration. If that account can modify a file, a filesystem tool may be able to modify it too. For a remote connector, review the permissions and credentials granted to that connector, including any requested OAuth scopes.
- Connect only servers you trust, and check who publishes and maintains them.
- Limit local filesystem servers to the specific working directories they need.
- Review requested app permissions, credentials, and scopes before granting access.
- Read tool approval prompts carefully, especially for actions that create, modify, move, or delete data.
- Be alert to prompt injection: content from a connected app or file can try to influence the assistant’s actions.
- Monitor how the tools behave and revoke access when it is no longer needed.
Anthropic’s remote MCP integration guidance warns that custom connectors can reach services Anthropic has not verified, and that connected tools may read, create, modify, or delete data. User approval prompts are useful checkpoints, but they do not remove the underlying permissions of the server process or connector.
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What should I check if the server does not connect?
- Check the host’s connection status. Look for the server or connector in Claude Desktop’s tools or connection list.
- Inspect MCP logs. Use the host’s available logs or troubleshooting details to identify startup or connection errors.
- Verify the server independently. Confirm its command, package, and required runtime match the server publisher’s current instructions.
- Check paths and access. Make sure configured directories exist and that the server process can access them. For a remote connector, check required credentials, scopes, network reachability, and firewall rules.
- Review host settings and policy. Missing required configuration, API keys, app permissions, or organization policy can block a connection.
- Restart or reconnect the host. For Claude Desktop’s manual local configuration, fully quit and relaunch the app after saving changes.
For Claude Desktop-specific extension checks, consult Anthropic’s local MCP server guidance. The exact compatibility and setup details depend on the host, server, and version; verify that combination in its current official documentation.
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