MCP Is Dead

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Reference: MCP is dead. Long live the CLI

After reading the above article, we ran the experiments on our actual stack. This document covers the original argument, additional research, and our measurements.

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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. The performance, debugging, and architectural arguments below still apply.

What's Wrong with MCP

MCP (Model Context Protocol) connects LLMs to external tools (GitHub, Linear, Notion, Slack, etc.).

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