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HomeDocsClaude Code CLI 14 Oct 2026
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Claude Code gateway compatibility guide changedllm-gateway-protocol

Nearest release: v2.1.299, 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 14 Oct 2026 02:34 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 14 Oct 2026 02:37 UTC.

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First seen 14 Aug 2026 this site's first read of the page
Recorded edits41to this page, all time

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145145| `x-claude-code-request-class` | What kind of request this is: `main` for a turn of the main conversation, `subagent` for a turn of a [subagent](/docs/en/sub-agents), `workflow` for an agent running inside a workflow, `compaction` for the summarization request that compacts a conversation, or `auxiliary` for side requests such as session titles, classifiers, and summaries. Sent on every request |
146146| `x-claude-code-agent-type` | The kind of subagent that issued the request: a built-in agent type name such as `Explore`, `Plan`, or `general-purpose`, or `custom` for a user-defined agent, `teammate` for an [agent team](/docs/en/agent-teams) member running in the lead's process, or `fork` for a [fork](/docs/en/sub-agents#fork-the-current-conversation). Present only on a subagent's own turns; a subagent's compaction or side requests keep the agent ID but carry no type. A user-chosen agent name is never sent |
147| `x-claude-code-compaction` | Present on the request that summarizes the conversation during a [compaction](/docs/en/prompt-caching#compacting-the-conversation). The value says what triggered it: `auto` when the context window approached capacity, `manual` for `/compact`, or `reactive` when the API rejected a request as too long. Absent on every other request |
147| `x-claude-code-compaction` | Present on the request that summarizes the conversation during a [compaction](/docs/en/prompt-caching#compacting-the-conversation). The value says what triggered it: `auto` when the context window approached capacity, `manual` for `/compact`, or `reactive` when the API rejected a request as too long. The value is also `auto` for [idle compaction](/docs/en/settings-reference#idlecompaction). Absent on every other request |
148148| `x-claude-code-context-compacted` | Present once, on the first main-conversation request after a compaction, with the same values as `x-claude-code-compaction`. The conversation prefix before this request is no longer used, so a cache keyed on it can be dropped |
149149| `x-claude-code-prev-tool-durations` | Measured run time of the tool calls whose results this request carries, as `<name>=<ms>;<name>=<ms>`, for example `Bash=742;Read=9`. Sent on the next request of the same conversation after a batch of tool calls, from the main session or a subagent |
150150| `x-claude-code-prompt-id` | Random UUID that identifies the user prompt a request serves. Requests serving one prompt share the value, including the turns of subagents that prompt started. Requests not attributed to a prompt omit it. Use it to group a session's requests by prompt. Requires Claude Code v2.1.283 or later |
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