Claude Code gateway compatibility guide changedllm-gateway-protocol
Nearest release: v2.1.317, 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 3 Nov 2026 02:14 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 3 Nov 2026 02:37 UTC.
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275275On v2.1.305 or later, Claude Code resends a request without [`defer_loading` fields and `tool_reference` blocks](https://code.claude.com/docs/en/mcp#tool-search-through-a-gateway) after a `400` or `422` that names tool search or whose cause it doesn't recognize. After a successful retry, later requests in that conversation omit them too.
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277The developer's requests keep working without any change on the gateway, with their MCP tools loaded upfront. When Claude Code tries tool search again, the gateway sees another rejected request followed by its retry. For tool search itself, Claude Code expects the gateway to forward the `defer_loading` fields and `tool_reference` blocks with their `anthropic-beta` value.
277The developer's requests keep working without any change on the gateway, with their MCP tools loaded upfront. When Claude Code tries tool search again, the gateway can see another rejected request followed by its retry. For tool search itself, Claude Code expects the gateway to forward the `defer_loading` fields and `tool_reference` blocks with their `anthropic-beta` value.
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279279### Disable pre-release capabilities
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