MCP Is Dead
The Model Context Protocol (MCP) has been criticized for its inefficiency and reliability issues. Developers have reported that MCP consumes a significant portion of the context window, limiting the space available for actual tasks. Despite recent updates aimed at improving performance, concerns about its operational reliability remain prevalent among users.
- ▪MCP connects large language models to external tools but has been deemed inefficient by developers.
- ▪It consumes over 10% of the context window just for tool definitions, limiting available space for actual work.
- ▪Recent updates have attempted to address context usage, but reliability issues persist.
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💡Reference: MCP is dead. Long live the CLIAfter reading the above article, we ran the experiments on our actual stack. This document covers the original argument, additional research, and our measurements.📌Update: Since these measurements were taken, Claude Code has rolled out Tool Search with Deferred Loading, which loads MCP tool schemas on-demand and reduces context usage by 85%+. The context bloat described in Problem 1 is largely addressed for users on current Claude Code versions.
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