Connect Claude Code to tools via MCP changedmcp
Nearest release: v2.1.301, published 2 hours before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
Upstream edited this page at 15 Oct 2026 17:01 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 15 Oct 2026 17:07 UTC.
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14791479Before v2.1.296, the shorter limit was 2,048 characters, and before v2.1.295 it applied to every tool description, including one loaded through tool search.
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1481To change the limits for every MCP server in your session, set [`CLAUDE_CODE_MAX_MCP_DESCRIPTION_LENGTH`](/docs/en/env-vars#variables) to a number of characters. The number you set replaces both limits: `8192`, for example, raises the shorter limit and lowers the longer one. This variable requires Claude Code v2.1.280 or later.
1481Descriptions and instructions from some of the MCP servers that Anthropic hosts at `api.anthropic.com` reach Claude in full. To change the limits for the other MCP servers in your session, set [`CLAUDE_CODE_MAX_MCP_DESCRIPTION_LENGTH`](/docs/en/env-vars#variables) to a number of characters. The number you set replaces both limits: `8192`, for example, raises the shorter limit and lowers the longer one. This variable requires Claude Code v2.1.280 or later.
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14831483<h4 id="per-tool-alwaysload">
14841484 Mark a tool to load upfront or stay deferred
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