docs(integrations): recommend anthropic_messages for Claude through an LLM gateway - #874
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Included review availability: This review used your included allowance. Your plan provides up to 12 included reviews per hour; 11 remain after this review. WalkthroughThe integration guides add Claude gateway setup, thinking, forwarded-key routing, prompt-cache, and cost-estimation guidance. The TOML schema documents the optional ChangesClaude gateway documentation
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~12 minutes Merge Risk: ⚪ Minimal · up to The documentation is ready to merge after normal checks; no unresolved behavior or cost-estimate issue is established. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Review comments at @docs/integrations/pi.md:
- Line 115: Update the pi integration guidance near the `omit_body_fields`
setting to state that the workaround requires both `extra_body` and the target
`reasoning_effort` to be unset, since either can restore the omitted field;
preserve the existing description of the workaround.
- Around line 156-157: Update the pricing explanation and the `claude-opus-5-5`
example to reflect that cache-read ratios vary by model: Opus 5.5 uses 0.05×,
while Sonnet 5.5 uses 0.1×. Qualify any general ratio statement or use a generic
model name where the example does not specify a model.
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Signed-off-by: Elyas Mehtabuddin <emehtabuddin@nvidia.com>
Signed-off-by: Elyas Mehtabuddin <emehtabuddin@nvidia.com>
…and key setup steps Signed-off-by: Elyas Mehtabuddin <emehtabuddin@nvidia.com>
…c's published cache prices Signed-off-by: Elyas Mehtabuddin <emehtabuddin@nvidia.com>
… Anthropic clients Signed-off-by: Elyas Mehtabuddin <emehtabuddin@nvidia.com>
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- Around line 240-262: Add the standalone-server caveat to both forwarding
sections, clarifying that the forward_auth configurations apply only to
standalone switchyard-server and are rejected by the native Nemo Relay plugin.
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What
Developers who run pi or Oh My Pi through Switchyard can reach Claude through their organization's LLM gateway, such as a LiteLLM proxy. The gateway serves Claude on three endpoints, and the
formatof the Claude target's LLM client decides which one Switchyard calls. On the gateway I tested, two of the formats fail. Withopenai_responses, Claude never reads its prompt cache, so every turn pays full price. With either OpenAI format, requests with thinking on get HTTP 400. The guides don't say which format to use. This PR adds a section to the pi and Oh My Pi guides that recommendsanthropic_messagesfor Claude targets and explains both failures.Switchyard configs whose Claude targets already use
anthropic_messagesneed no change. Oh My Pi users who call Switchyard throughanthropic-messagesstill need one thinking setting on the model entry, described below. This PR changes only docs.How Switchyard reaches Claude through a gateway
Switchyard translates each request to the format of the target's LLM client, so the agent's request API does not matter. Only the client's
formatdoes:formatopenai_responsesopenai_chatanthropic_messagesWhat changes
docs/integrations/pi.mdgets a section, "Claude through an LLM gateway". It opens with the recommendation, a sample LLM client, and the table above. Then:jqcommand prints a warning, not $0, for a model without a price.omit_body_fields, and pi's thinking level then has no effect on that target."apiKey": "$GATEWAY_API_KEY") and which request APIs a route accepts when it forwards that key.docs/integrations/oh_my_pi.mdpoints to the pi section and covers what differs for Oh My Pi: onanthropic-messagesit needsthinking: {mode: anthropic-adaptive, ...}on the model entry, and it readsapiKey: GATEWAY_API_KEYwithout a$. "Check the routing" now also says that Oh My Pi sends no session header on the Responses API.docs/reference/toml_schema.mdlistsomit_body_fields, which the config parser already accepts.Why
These results come from a LiteLLM gateway. A local proxy between
switchyard-serverand the gateway logged each request that Switchyard sent. The Evidence section has the details.Claude never reads its prompt cache on
/v1/responses. I sent the same 5,765-token prompt twice through each format to Claude Sonnet 5. The second request read 5,763 tokens from the cache onopenai_chatand onanthropic_messages, and 0 onopenai_responses. A coding agent resends the whole conversation on every turn. With the cache, the repeated part costs 0.1 times the input price on Sonnet 5 and 0.05 times on Opus 5.5. On/v1/responses, every turn pays the full price. Nothing fails, so the only signs are"cached_tokens": 0in the routing log and a larger bill.Both OpenAI formats return HTTP 400 when thinking is on. Claude Opus 5.5 and Sonnet 5 accept only adaptive thinking. On Chat Completions and Responses, pi and Oh My Pi send the thinking level in OpenAI form. When the model entry has
reasoning: true, as in the pi guide's example, pi sends it on every request, even without--thinking. Switchyard passes the level to an OpenAI-format client in OpenAI form. The gateway turns it into Anthropic's olderthinking: {type: "enabled"}, which these models refuse. For ananthropic_messagesclient, Switchyard sends the form Claude accepts:The guides' placeholder keys fail when a route forwards the key. A route that forwards the caller's key (
forward_auth = true) sends the gateway whatever key the agent sends. The guides set pi'sapiKeyto the placeholder"switchyard"and Oh My Pi toauth: none, so the gateway returned HTTP 401 for both.Notes for reviewers
Start with the new pi section. The Oh My Pi section covers only what differs.
#873, now merged, lets one route forward a gateway key to OpenAI-format and Anthropic-format clients that use the same scheme, host, and port. The Forwarded keys sections describe the setup it allows, and the Evidence table has a pi run of it.
This PR documents one limit without fixing it. A route whose only forwarding clients use
anthropic_messagesaccepts only/v1/messages, and pi should not use that API: pi's Anthropic client treats a change in the served model as a model switch. For pi, those Claude targets needopenai_chatwithomit_body_fields, or a key that the server holds. Removing it needs a code change to the check that refuses other request APIs.Evidence
All runs used
switchyard-serverwith a LiteLLM gateway. A local proxy between them logged each request that Switchyard sent, with header names but not header values.gateway.example.comreplaces the gateway host, and public model IDs replace the gateway's own IDs./v1/responsesnever reads Claude's cachecached_tokens: 5,763 onopenai_chat, 0 onopenai_responses, 5,763 onanthropic_messagesmediumopenai_chatandopenai_responses: 400"thinking.type.enabled" is not supported for this model.anthropic_messages: 200, withthinking: {type: "adaptive"}and 234 and 149 reasoning tokens--thinkingreasoning: trueand no--thinking, Claude onopenai_chatreasoning_effort: "medium", and the gateway returned 400omit_body_fieldsavoids the 400omit_body_fields = ["reasoning_effort"]onopenai_chator["reasoning"]onopenai_responsesanthropic-messagesneedsanthropic-adaptive--thinking medium, Claude Opus 5.5 and Sonnet 5 onanthropic_messagesthinking: {type: "enabled", budget_tokens: 8192}and 400. With it:thinking: {type: "adaptive"},output_config.effort: "medium", and 200openai-completionsandopenai-responseswith--thinking medium/v1/messagesgotthinking: {type: "adaptive"}at effortmedium, and returned 200"apiKey": "switchyard", and Oh My Pi withauth: noneinvalid_credential, and 401No api key passed inapiKeyneeds the$"$GATEWAY_API_KEY", then with"GATEWAY_API_KEY"invalid_credentialanthropic_messagesrefuses pi's request APIsroute claude-forwarded forwards an Anthropic login; call it through /v1/messages--thinking medium; the server held no key; the judge onopenai_responsesand Claude onanthropic_messagesused one origin/v1/responses200 and/v1/messages200, both with pi'sauthorizationheader. Claude got adaptive thinking atmediumand wrote 9,322 tokens to the cache/v1/chat/completionswrote 8,036 of 8,048 tokens to the 1-hour cache./v1/messageswrote 8,031 tokens to the 5-minute cacheprices.jsonwarning: no price for model claude-opus-5-5; add it to prices.jsonThe cache test used one LLM client per format, each with its own passthrough route. The clients pointed at the local proxy in front of the gateway:
These are the routing records from a Chat Completions caller, read with
jq -c '{route_id, prompt_tokens, cached_tokens, cache_creation_tokens}'. A second pass from a Responses caller gave the same numbers:{"route_id":"claude-chat","prompt_tokens":5765,"cached_tokens":0,"cache_creation_tokens":5763} {"route_id":"claude-chat","prompt_tokens":5765,"cached_tokens":5763,"cache_creation_tokens":0} {"route_id":"claude-responses","prompt_tokens":5765,"cached_tokens":0,"cache_creation_tokens":0} {"route_id":"claude-responses","prompt_tokens":5765,"cached_tokens":0,"cache_creation_tokens":0} {"route_id":"claude-messages","prompt_tokens":5765,"cached_tokens":0,"cache_creation_tokens":5763} {"route_id":"claude-messages","prompt_tokens":5765,"cached_tokens":5763,"cache_creation_tokens":0}The forwarding test used these LLM clients, both pointed at the local proxy so that they shared one origin. The server config held no key:
The guide's
jqcost command printed this for routing records from these runs:Summary by CodeRabbit
omit_body_fieldstarget setting, including its default and how later body settings can restore omitted fields.