MCP Versioning
Industry Definition Set • Entity Resolution Path: /glossary/mcp-versioning
Quick Answer / TL;DR
MCP versioning refers to the protocol versioning mechanism used by clients and servers to ensure compatibility during communication.
Key Takeaways
- Version exchange during initialization
- Supports protocol evolution
- Fallback to common version if possible
- Graceful failure on incompatibility
Definitive Statement: MCP versioning refers to the protocol versioning mechanism used by clients and servers to ensure compatibility during communication.
Technical Context & Protocol Usage
- Detailed Explanation
- During initialization, the client and server exchange protocol versions to ensure they speak the same dialect. If versions differ, the client and server may negotiate a common version or fail gracefully. This allows the protocol to evolve without breaking existing implementations.
Format & Payload Metadata
Format: JSON-RPC 2.0
Latency: Sub-50ms for version negotiation
Real-World Implementation Use Case
An old MCP client connects to a newer server; they negotiate to use the common version.
Cite This Page
MLA Style:
MCPserver.in Engineering. "MCP Versioning." MCPserver.in Knowledge Hub, 20 July 2026, mcpserver.in/glossary/mcp-versioning.
Related Terms
Model Context Protocol (MCP)
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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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