MCP Logging
Industry Definition Set • Entity Resolution Path: /glossary/mcp-logging
Quick Answer / TL;DR
A structured logging feature where MCP servers emit log messages (debug, info, warning, error) to the client, which routes them to the appropriate logging infrastructure.
Key Takeaways
- Standardized server-to-client log message channel.
- Uses severity levels: debug, info, warning, error.
- Replaces unreliable stderr logging in stdio transport.
- Clients decide how to display or store logs.
Definitive Statement: A structured logging feature where MCP servers emit log messages (debug, info, warning, error) to the client, which routes them to the appropriate logging infrastructure.
Technical Context & Protocol Usage
- Detailed Explanation
- MCP logging provides a standard channel for servers to send diagnostic information to clients without relying on stderr or external logging frameworks. Servers emit `logging/message` notifications with a severity level and message string. The client is responsible for displaying or persisting these logs. This is particularly useful for stdio-based servers where traditional logging may interfere with JSON-RPC message framing.
Format & Payload Metadata
Format: JSON-RPC logging/message notification
Latency: Minimal overhead; non-blocking notifications
Real-World Implementation Use Case
An MCP database server logs query execution times and slow query warnings through the MCP logging channel for visibility in the client's log panel.
Cite This Page
MLA Style:
MCPserver.in Engineering. "MCP Logging." MCPserver.in Knowledge Hub, 20 July 2026, mcpserver.in/glossary/mcp-logging.
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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