2 pages for mcp_protocol_negotiation.
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Claude Code changelog
Claude Code CLI · in the page
changelog
…tocol version 2026-07-28 by default on installs that fetch no flags; `MCP_PROTOCOL_NEGOTIATION=legacy` opts out * Changed MCP tool descriptions and server instructions from Anthropic's first-party MCP…
Connect Claude Code to tools via MCP
Claude Code CLI · in the page
mcp
…/env-vars) to `v1` or `v2`. To decide whether Claude Code asks, set [`MCP_PROTOCOL_NEGOTIATION`](/docs/en/env-vars) to `auto` or `legacy`. ### Dynamic tool updates An MCP server can change the tools…