mcp.schema.result

The server's response to a tool call.

Any errors that originate from the tool SHOULD be reported inside the result object, with isError set to true, not as an MCP protocol-level error response. Otherwise, the LLM would not be able to see that an error occurred and self-correct.

However, any errors in finding the tool, an error indicating that the server does not support tool calls, or any other exceptional conditions, should be reported as an MCP error response.

The server's response to a completion/complete request

The client's response to a sampling/create_message request from the server. The client should inform the user before returning the sampled message, to allow them to inspect the response (human in the loop) and decide whether to allow the server to see it.

The server's response to a prompts/get request from the client.

After receiving an initialize request from the client, the server sends this response.

The server's response to a prompts/list request from the client.

The client's response to a roots/list request from the server. This result contains an array of Root objects, each representing a root directory or file that the server can operate on.

The server's response to a tools/list request from the client.

The server's response to a resources/read request from the client.