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MCP lets Claude connect to a server that exposes a product’s data, tools, or workflows. For a developer workflow, configure an MCP server in Claude Code. To put MCP-backed capabilities inside your SaaS, use the remote MCP connector in the Claude Messages API. These are separate integration routes—not a feature called “Claude routines”—and the right choice depends on where your Claude experience will run.
What MCP does in a SaaS integration
The Model Context Protocol (MCP) is an open protocol for connecting AI applications to external systems. An MCP server makes selected data, tools, or workflows available to a client such as Claude. That can let Claude work with a connected system rather than relying only on information a user has copied into a conversation. The MCP documentation describes the protocol as “an open-source standard for connecting AI applications to external systems.”
For a SaaS builder, the key design decision is not simply whether to use MCP. It is whether Claude is being configured as a developer’s tool, or whether your product is making a Claude-powered capability available to its users.
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Choose the route that matches where Claude will run
| Decision | Claude Code MCP setup | Messages API MCP connector |
|---|---|---|
| Main use | Developer or operator workflow in Claude Code | Claude workflow built into a SaaS application |
| Server reachability | Local stdio process or remote server | Remote MCP server, according to the connector documentation |
| Configuration surface | Claude Code CLI and configuration scopes | Messages API request and connector tool configuration |
| Authentication and controls | Server-specific authentication; project-server approval and configuration scope can apply | OAuth bearer-token support and per-tool allow, deny, or configuration controls |
| Change sensitivity | CLI behavior and transport guidance can vary by version | Connector is documented as beta; check the current API reference for request shape and beta header |
Use Claude Code when the user is a developer working in Claude Code and needs access to a service during that workflow. Use the Messages API connector when your application needs to call remote MCP tools as part of a product experience. The API connector documentation describes remote servers; do not assume it can connect directly to a local stdio process.
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Connect Claude Code to tools through MCP
Claude Code supports MCP servers launched as local processes over stdio and servers reached remotely. For a hosted service, use the endpoint, transport, authentication method, and version guidance supplied by that service. The Claude Code documentation recommends HTTP as the broadly supported option for remote connections; some servers expose SSE, and transport behavior may depend on the Claude Code version.
Add a remote HTTP server
The documented command form is:
claude mcp add --transport http <name> <url>Replace <name> and <url> with the server name and endpoint provided by its owner. The command shape is documented in Anthropic’s CLI reference; check that reference and the Claude Code MCP guide for current syntax and version requirements before using it.
Run a local stdio server
Choose stdio when the MCP server is a process launched on the same machine as Claude Code. Claude Code’s documented configuration pattern places the server launch command after --; for example, a configured command can invoke npx. Follow the server’s own setup instructions for the exact command and any required environment variables. Do not substitute a remote URL or assume that a local server uses the same authentication flow as a hosted one.
Choose an appropriate configuration scope
Claude Code supports configuration scopes, including user-level configuration and project-shared configuration. Select the scope that matches who should use the server, and review approval for project-configured servers before accepting it. Avoid committing live credentials in project configuration; use the authentication and secret-handling approach documented for the specific server.
Inspect the configured connection
Use Claude Code’s status and management commands to check the server entry:
claude mcp listlists configured servers.claude mcp get <name>shows details for a named server./mcpopens MCP management from Claude Code.
A listed configuration does not prove that the server is reachable or authenticated. Complete the server’s authentication flow if required, then verify the connection and try each intended tool.
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Connect a remote MCP server to the Claude Messages API
For an MCP-backed feature inside your SaaS, Anthropic’s Messages API MCP connector can connect to remote MCP servers without requiring your application to implement a separate MCP client. The connector documentation describes tool calls, OAuth bearer tokens, multiple servers, and controls to allow or block tools or configure them individually.
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The connector is marked beta. Before implementation, check the current API reference for the supported request shape and any beta header, and confirm the server is remotely reachable. Do not treat a beta interface as a fixed contract.
Map MCP tools to product permissions
Decide which product data and actions Claude should be able to access, then expose only the tools needed for the feature. Keep tool descriptions and inputs narrow and consistent with your SaaS’s authorization model. A tool being available to the API connector must not grant a logged-in user more access than your service would otherwise allow.
Authentication is server-specific. The connector documentation lists OAuth bearer-token support, but that does not mean every MCP server uses OAuth or that one authentication design fits every SaaS. Follow the server’s current instructions, keep credentials out of client-visible code, and preserve your application’s own checks for user identity and permissions.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Build in access control and trust checks
MCP tools may read information or perform actions, so the permissions granted to a server have real consequences. Anthropic advises users to trust the servers they install and warns that servers retrieving external content can expose Claude to prompt-injection risks. This is a design concern, not evidence that every MCP server is unsafe.
- Expose the smallest useful set of tools, data, and actions.
- Make sure each action remains within the logged-in user’s and your service’s authorization rules.
- Use only credentials required for the intended integration; do not publish live tokens or place them in client-side code.
- Review project-server approval and configuration scope when setting up Claude Code for a team.
- Test authentication, expected results, denied actions, and error handling for every exposed tool.
- Treat content returned by a server as external input, especially when it can include user-supplied or otherwise untrusted text.
These checks are implementation guidance: a successful connection alone does not establish that your SaaS’s authorization or error handling is correct.
A practical implementation sequence
- Choose the runtime. Decide whether you are connecting Claude Code for a developer workflow or adding an MCP-backed Claude feature to your SaaS through the Messages API.
- Define the capability. List the specific data and actions Claude needs, and align each tool with actual product permissions.
- Pick the topology. Use a local stdio process for a local Claude Code workflow, or a remotely reachable server for a hosted integration. The API connector route is documented for remote MCP servers.
- Follow the server’s connection instructions. Use its actual endpoint, supported transport, and authentication flow; do not copy an endpoint or credential pattern from an unrelated example.
- Limit access. Choose the appropriate Claude Code configuration scope and review project-server approval, or configure the API connector’s tool controls for the SaaS feature.
- Verify behavior. Check connection and authentication status, then test each permitted action, authorization boundary, and failure path in your application.
- Review trust assumptions. Consider the origin of server-returned content and how the integration handles untrusted input.
Official guidance can change: consult the Claude Code MCP documentation, CLI reference, and Messages API connector documentation for current transport, configuration, and beta details.
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