Claude Code gateway compatibility guide changedllm-gateway-protocol
Nearest release: v2.1.317, published 2 hours after 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 2 Nov 2026 21:44 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 2 Nov 2026 22:07 UTC.
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250250On v2.1.305 or later, a request carrying [`defer_loading` fields and `tool_reference` blocks](https://code.claude.com/docs/en/mcp#tool-search-through-a-gateway) can arrive again without them after a `400` or `422` whose cause Claude Code doesn't recognize. After a successful retry, later requests omit them too.
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252The developer's requests keep working without any change on the gateway, with their MCP tools loaded upfront. Claude Code tries tool search again later, so the gateway can see another rejected request followed by its retry. To keep the fields out of every request, have developers set `ENABLE_TOOL_SEARCH=false`. For tool search itself, Claude Code expects the gateway to forward the `defer_loading` fields and `tool_reference` blocks with their `anthropic-beta` value.
252The developer's requests keep working without any change on the gateway, with their MCP tools loaded upfront. Claude Code tries tool search again later, so 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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254254### Disable pre-release capabilities
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