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An MCP server appearing in a directory does not mean it is installed, trusted, or running. The directory helps a client discover distribution information; the client then resolves that information into a local command or remote endpoint, launches or connects, and completes MCP initialization before the server is ready for protocol operations.
What an MCP directory listing tells you
The official MCP Registry is a catalog and API for discovering publicly available MCP servers. Its entries contain information maintained by publishers, so a listing is not a runtime health check and does not prove that a server is available or suitable for your use. The registry is designed as an upstream source that downstream registries can adapt. The registry announcement describes the project and its publisher-maintained information; the registry API reference documents listing, search, version and status operations, along with validation and publishing authentication.
Think of the listing as discovery and distribution metadata. Your chosen client or installer decides how to interpret it and whether it supports that server’s distribution route.
How do I install an MCP server?
There is no single install command for every MCP server. The standardized server.json format can describe package identity and version, registry and identifier, transport, runtime hints, launch arguments, environment variables, an OCI image, or a remote endpoint. Those fields guide downstream tools; they do not guarantee that every MCP client supports every package type or setup flow. See the server.json format and examples.
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Choose the distribution route described by the entry
- Node package: metadata can identify an npm package, such as
@modelcontextprotocol/server-filesystem. A client may use a Node runtime and package-resolution command to start it. - Python package: an entry can identify a PyPI package and a runner such as
uvx. - Rust binary: the documented example installs with Cargo and then invokes the binary available on
PATH. - OCI image: metadata can point to a container image and include launch or mount arguments.
- Remote service: metadata can specify a remote endpoint and transport, avoiding a locally launched package process.
These are different distribution and execution paths, not interchangeable commands. Check the entry’s package, runtime and transport fields, then confirm that your client supports the route before configuring it.
How do I connect an MCP server to my client?
The configuration depends first on whether the server runs as a local process over stdio or is hosted remotely over HTTP. The MCP Inspector documentation gives concrete examples for its own configuration, including a local npx command and a Streamable HTTP endpoint. Its fields and defaults are specific to Inspector; other clients may use different configuration files and setup screens. Read the Inspector server configuration documentation for those examples.
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| Setup detail | Local package over stdio | Remote endpoint over HTTP |
|---|---|---|
| What you configure | Executable command, arguments, working directory and optional environment variables | Server URL and, where needed, headers or authorization |
| What becomes active | A child process on the client host | A connection to a server hosted elsewhere |
| Distribution clue | Package/runtime identifier or OCI image in metadata | Remote endpoint and transport in metadata |
| Readiness boundary | Process starts, then MCP initialization succeeds | Endpoint connects, then MCP initialization succeeds |
| Key dependency | Compatible runtime, package, permissions and environment | Reachable endpoint and any required authentication |
This comparison describes the documented configuration and protocol shapes; it is not a benchmark, nor does it imply that clients expose identical setup interfaces. The cited documentation does not establish a particular availability guarantee for remote services.
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Local stdio: the client launches a process
For a stdio server, the client uses its configured command and arguments to start a child process on the client’s machine. The process and client exchange MCP messages through standard input and output. A successful process launch is only an early step: it does not by itself establish that the server has completed MCP setup.
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Remote HTTP: the client opens a connection
For a remote server, the client connects to the configured HTTP endpoint using the supported transport. The endpoint must be reachable, and any required headers or authorization must be accepted. A successful network connection likewise does not prove that MCP operations are ready.
The selected client determines how package metadata is resolved and how a process is launched or an endpoint is contacted. Registry metadata describes possible distribution and transport routes; it is not a universal installer.
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How do I know an MCP server is running?
Distinguish three checkpoints: the directory entry exists, a local process has started or a remote connection has opened, and MCP initialization has succeeded. The last is the meaningful protocol-readiness boundary.
Under the MCP lifecycle specification dated 2025-11-25, the client sends initialize. The server responds with the negotiated protocol version, server information and its capabilities. After successful initialization, the client sends notifications/initialized. Client and server must then follow the negotiated protocol version and use only the capabilities negotiated for that connection. See the MCP lifecycle specification; confirm that your client and server support the relevant version.
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- A directory listing confirms discoverability, not installation or health.
- A spawned child process confirms that a launch was attempted, not that MCP initialization succeeded.
- An opened HTTP connection confirms connectivity, not that MCP initialization succeeded.
- A completed initialization exchange establishes protocol readiness for operations supported by the negotiated capabilities.
Why does my MCP server show in the directory but not run?
Trace the chain in order rather than treating the listing as an install result. The failure may occur while resolving a package, starting a process, opening a remote connection, or negotiating protocol readiness.
- Check the distribution fields. Identify whether the entry describes a local package, binary, OCI image or remote endpoint. Confirm the selected client supports that route.
- For stdio, verify the launch configuration. Check the executable, arguments, working directory and environment values against the package’s requirements. The configured runtime and permissions must work on the client host.
- For HTTP, verify endpoint access. Confirm the URL is correct and reachable from the client, and supply any required headers or authorization.
- Look for lifecycle completion. Determine whether the client received a successful
initializeresponse and sentnotifications/initialized. If the process starts or the endpoint connects but initialization does not complete, the server is not ready for normal MCP operations. - Check version and capability compatibility. The client and server must use the negotiated protocol version and only capabilities established during initialization.
How does an MCP client stop a local server?
During normal operation, the client and server exchange messages allowed by their negotiated capabilities. For a stdio server, the lifecycle specification says the client should close the child process’s input stream and wait for it to exit. If it does not exit within a reasonable time, the client may escalate with SIGTERM or SIGKILL. Shutdown behavior for other transports follows their underlying transport rather than this stdio process sequence.
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