MCP Result
Industry Definition Set • Entity Resolution Path: /glossary/mcp-result
Quick Answer / TL;DR
The successful response payload in a JSON-RPC response message, containing the data returned by the server.
Key Takeaways
- Successful response payload in JSON-RPC.
- Shape depends on the called method.
- Paired with the original request via the `id` field.
- Absent in error responses (which have `error` instead).
Definitive Statement: The successful response payload in a JSON-RPC response message, containing the data returned by the server.
Technical Context & Protocol Usage
- Detailed Explanation
- In a successful JSON-RPC response, the `result` field contains the server's answer. For MCP, this might be a tool result, a resource contents array, or a capability object. The shape of the result depends entirely on the method that was called. The `id` field must match the original request's `id`.
Format & Payload Metadata
Format: JSON object per JSON-RPC 2.0
Latency: No overhead; response serialization
Real-World Implementation Use Case
A successful `tools/list` response returns a result object containing an array of tool definitions.
Cite This Page
MLA Style:
MCPserver.in Engineering. "MCP Result." MCPserver.in Knowledge Hub, 20 July 2026, mcpserver.in/glossary/mcp-result.
Related Terms
Model Context Protocol (MCP)
An open, secure protocol that standardizes how artificial intelligence agents and large language models (LLMs) exchange context, tools, prompts, and data resources with external servers.
JSON-RPC 2.0
A lightweight, stateless remote procedure call (RPC) protocol defined in JSON that utilizes request, response, and notification message frames.
Stdio Transport (Standard Input/Output)
A local-only transport mechanism where the AI client spawns the MCP server as a child process and communicates via standard input (stdin) and standard output (stdout) channels.
SSE Transport (Server-Sent Events)
A lightweight, unidirectional HTTP-based streaming protocol used by remote MCP servers to push messages to AI clients, with client-to-server writes sent over standard POST requests.
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