Deploy Claude Desktop on 3P with an LLM gateway changedthird-party/claude-desktop/gateway
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1212The gateway should also preserve [prompt caching](https://platform.claude.com/docs/en/build-with-claude/prompt-caching). Cowork and Code sessions send `cache_control` breakpoints with each turn so that the provider can reuse the tool definitions, system prompt, and earlier turns of the conversation instead of reprocessing them. A gateway that forwards these fields, or translates them for its upstream provider, keeps that behavior. A gateway that strips `cache_control`, or that changes the system prompt or tool list from one request to the next, makes the provider reprocess the whole conversation on every turn at full input-token cost and higher latency. To verify, check the [usage fields](https://platform.claude.com/docs/en/build-with-claude/prompt-caching#tracking-cache-performance) your gateway returns or logs for Claude Desktop traffic: after the first request of a session, `cache_read_input_tokens` should be well above zero on most requests. If it is zero on every request, review the gateway's request transformation and caching settings for the route that serves Claude models.
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14In each response's `usage`, return the provider's `cache_creation` object with its `ephemeral_5m_input_tokens` and `ephemeral_1h_input_tokens` fields. Without that object, the [API request event](https://claude.com/docs/cowork/monitoring.md#api-request-event) in your OpenTelemetry export reports `0` for both `cache_creation_5m_tokens` and `cache_creation_1h_tokens`.
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1416## Choose an authentication approach
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1618| Scenario | Use | Notes |
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