Go/Zen gateway: intermittent 400 "reasoning_content must be passed back" for clients that don't replay DeepSeek reasoning (store-miss on call_id) #58064

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1. opencode-agent commented on Oct 22, 2026

   

   opencode-agentBot

   on Oct 22, 2026 – with OpenCode Agent

   Contributor

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   Thanks for the detailed captures and the minimal request.

   This happens inside the hosted Go/Zen gateway, not in the OpenCode app, so we couldn't reproduce it here: our sandbox has no Go account, and the gateway code isn't in this repository. A maintainer with access to the gateway will need to check the request IDs you listed (53529188…, eb8c94c5…, d7fbd6c2…) against the server side. The key question is whether gateway-issued call_ids sometimes fail to find their stored reasoning. A call_id the gateway never issued getting this 400 may be expected, because DeepSeek requires the reasoning to be sent back with earlier tool calls.

   The redacted failing request bodies you offered would help that check, so please attach one if you can.

   Related issues:

   • Responses: tool-call continuation intermittently fails with 400 "The reasoning_text in the thinking mode must be passed back to the API" #56776: the same intermittent 400 on /responses with OpenCode's own client and deepseek-v4.1-flash
   • provider: opencode-go 400 stub on long sessions varies per attempt (identical bytes replay 200/400/200) #51201: the same request bytes get 200 or 400 on different attempts in long Go sessions
   • reasoning: repetition loop on deepseek-v4.1-flash, plus a paired reasoning_text must be passed back 400 #55584: the earlier report your findings follow up on
   • Console Go relay: HTTP 400 (empty body) when request combines reasoning_content echo-back with reasoning_effort on deepseek-v4-flash #48180, Title: opencode-go / deepseek-v4-flash: continuing a long session returns 400 with opaque body {"object":"error","model":"deepseek-v4-flash"} #48093: other DeepSeek 400s through the Go gateway
2. sanqiuyef commented on Oct 22, 2026

   

   sanqiuyef

   on Oct 22, 2026

   Author

   More actions

   Answers to the key question, plus the redacted failing request body.

   Provenance check: the failing call_ids are all gateway-issued

   I correlated the failing request d7fbd6c2… (completed 2026-10-22T07:42:29Z, 122 input items, 44 function_call items, zero reasoning items, reasoning_effort: "max") against the captured responses in the same session:

   • 44/44 call_ids in the failing request were issued by the gateway itself in earlier successful responses of the same session.
   • Oldest: call_00_WvcbFtK4nX9QAq4PyI8L6126 — issued 07:06:03Z (first response of the session), replay failed 07:42:29Z (~36 min later).
   • Newest: call_00_jthmk2w452aiqncwqu07fg9l — issued 07:41:06Z by the immediately preceding successful response, replay failed 07:42:29Z (83 seconds later).

   So to your key question: yes — gateway-issued call_ids sometimes fail to find their stored reasoning, even one issued seconds earlier in the same session. That matches the 200/400 flakiness of #51201 better than a simple TTL story (fresh ids miss too, at least intermittently). Failed requests across the day: 53529188… (42 items), eb8c94c5… (104), d7fbd6c2… (122) — identical shape, all with genuine call_00_… ids.

   This also fits #56776 (OpenCode's own client hitting the same 400 on /responses): whether or not the client replays reasoning items, a store miss on any single replayed call_id surfaces the raw DeepSeek 400.

   Redacted failing request body (d7fbd6c2…, /v1/responses)

   All message text, tool arguments and tool outputs are replaced with [redacted N chars]; call_ids and item order are preserved verbatim for server-side correlation. No credentials included (verified by scan).

   redacted request body (122 items)

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"[redacted 2457 chars]"}, {"type": "function_call_output", "call_id": "call_00_inqesqwosy8n73gt29svnix3", "output": "[redacted 337 chars]"}, {"type": "message", "role": "assistant", "content": [{"type": "output_text", "text": "[redacted 25 chars]"}]}, {"type": "function_call", "call_id": "call_00_3x0n5o2p3nr1wn7snqscm3jz", "name": "Bash", "arguments": "[redacted 389 chars]"}, {"type": "function_call_output", "call_id": "call_00_3x0n5o2p3nr1wn7snqscm3jz", "output": "[redacted 71 chars]"}, {"type": "function_call", "call_id": "call_00_zye9igomnw5gwjznnuzuv6gs", "name": "Bash", "arguments": "[redacted 479 chars]"}, {"type": "function_call", "call_id": "call_01_wl6023aeuue7nec32g3jc2yv", "name": "Bash", "arguments": "[redacted 273 chars]"}, {"type": "function_call_output", "call_id": "call_00_zye9igomnw5gwjznnuzuv6gs", "output": "[redacted 166 chars]"}, {"type": "function_call_output", "call_id": "call_01_wl6023aeuue7nec32g3jc2yv", "output": "[redacted 380 chars]"}, {"type": "message", "role": "user", "content": [{"type": "input_text", "text": "[redacted 999 chars]"}]}, {"type": "function_call", "call_id": "call_00_onqguj1dwl1rpb0qbyd2yo1v", "name": "Read", "arguments": "[redacted 157 chars]"}, {"type": "function_call_output", "call_id": "call_00_onqguj1dwl1rpb0qbyd2yo1v", "output": "[redacted 2134 chars]"}, {"type": "function_call", "call_id": "call_00_h3ehqbfuuxnxb3o4cs9ybiqb", "name": "Bash", "arguments": "[redacted 2261 chars]"}, {"type": "function_call_output", "call_id": "call_00_h3ehqbfuuxnxb3o4cs9ybiqb", "output": "[redacted 809 chars]"}, {"type": "message", "role": "assistant", "content": [{"type": "output_text", "text": "[redacted 88 chars]"}]}, {"type": "function_call", "call_id": "call_00_gcnwt5nthax19wrqqaahuqwp", "name": "Bash", "arguments": "[redacted 2491 chars]"}, {"type": "function_call_output", "call_id": "call_00_gcnwt5nthax19wrqqaahuqwp", "output": "[redacted 423 chars]"}, {"type": "message", "role": "user", "content": [{"type": "input_text", "text": "[redacted 421 chars]"}]}, {"type": "function_call", "call_id": "call_00_ET_iSDHOxFaD4gylbw7do5Y1822", "name": "Bash", "arguments": "[redacted 2504 chars]"}, {"type": "function_call_output", "call_id": "call_00_ET_iSDHOxFaD4gylbw7do5Y1822", "output": "[redacted 549 chars]"}, {"type": "message", "role": "assistant", "content": [{"type": "output_text", "text": "[redacted 206 chars]"}]}, {"type": "function_call", "call_id": "call_00_sag4oc0adppxgffkpfatcrts", "name": "Bash", "arguments": "[redacted 630 chars]"}, {"type": "function_call_output", "call_id": "call_00_sag4oc0adppxgffkpfatcrts", "output": "[redacted 6763 chars]"}, {"type": "message", "role": "user", "content": [{"type": "input_text", "text": "[redacted 387 chars]"}]}, {"type": "message", "role": "assistant", "content": [{"type": "output_text", "text": "[redacted 109 chars]"}]}, {"type": "function_call", "call_id": "call_00_4k8331hsd5mgehkbjm7jr5t2", "name": "Bash", "arguments": "[redacted 2098 chars]"}, {"type": "function_call_output", "call_id": "call_00_4k8331hsd5mgehkbjm7jr5t2", "output": "[redacted 547 chars]"}, {"type": "message", "role": "assistant", "content": [{"type": "output_text", "text": "[redacted 107 chars]"}]}, {"type": "function_call", "call_id": "call_00_0uelcckd873qrco6md9i0lbg", "name": "Bash", "arguments": "[redacted 1108 chars]"}, {"type": "function_call_output", "call_id": "call_00_0uelcckd873qrco6md9i0lbg", "output": "[redacted 299 chars]"}, {"type": "message", "role": "assistant", "content": [{"type": "output_text", "text": "[redacted 99 chars]"}]}, {"type": "function_call", "call_id": "call_00_ub3ap1thsgaxnfo8u00tfnxt", "name": "Bash", "arguments": "[redacted 471 chars]"}, {"type": "function_call_output", "call_id": "call_00_ub3ap1thsgaxnfo8u00tfnxt", "output": "[redacted 8227 chars]"}, {"type": "message", "role": "assistant", "content": [{"type": "output_text", "text": "[redacted 72 chars]"}]}, {"type": "function_call", "call_id": "call_00_4l787aw74hdxjdew0ch5bfqc", "name": "Bash", "arguments": "[redacted 683 chars]"}, {"type": "function_call_output", "call_id": "call_00_4l787aw74hdxjdew0ch5bfqc", "output": "[redacted 1353 chars]"}, {"type": "function_call", "call_id": "call_00_yn9twkwidd51sciqfts3dyym", "name": "Bash", "arguments": "[redacted 716 chars]"}, {"type": "function_call_output", "call_id": "call_00_yn9twkwidd51sciqfts3dyym", "output": "[redacted 1381 chars]"}, {"type": "message", "role": "assistant", "content": [{"type": "output_text", "text": "[redacted 53 chars]"}]}, {"type": "function_call", "call_id": "call_00_jthmk2w452aiqncwqu07fg9l", "name": "Bash", "arguments": "[redacted 2950 chars]"}, {"type": "function_call_output", "call_id": "call_00_jthmk2w452aiqncwqu07fg9l", "output": "[redacted 421 chars]"}]}

   The two other failing requests (53529188…, eb8c94c5…) have the same shape with 42 and 104 items; happy to attach them too if useful.
3. VictorHMH18713 commented on Oct 27, 2026

   

   VictorHMH18713

   on Oct 27, 2026

   More actions

   Same failure family, but reached through the Anthropic-native route (POST /zen/go/v1/messages), from Claude Code — which the Go docs list as a validated client. Two extra data points: the client never replays thinking either, and on streaming requests the gateway drops the upstream body entirely.

   Environment

   item	value
   Client	Claude Code 2.1.293 (claude-cli/2.1.293), ANTHROPIC_BASE_URL=https://opencode.ai/zen/go
   Route	Anthropic Messages API (/zen/go/v1/messages), stream: true
   Model	deepseek-v4.1-flash (effort high)
   Session header	Claude Code's native X-Claude-Code-Session-Id (recognized per the Go docs, no x-opencode-session needed)
   Observed	2026-10-27 07:24–07:44Z, 07:53Z, 08:15Z (all UTC)

   Symptom

   API Error: 400 status code (no body)
   

   Replaying the exact same conversation non-streaming returns the upstream error, so it is the same root cause as this issue, just surfacing on the Anthropic route:

   {"type":"error","error":{"type":"invalid_request_error","message":"Upstream request failed: [invalid_request_error] The `content[].thinking` in the thinking mode must be passed back to the API. (request_id: 65871f21-0908-4a0f-bc02-89f7c5fb6d1f) (request id: 202610270826085305488478268d9d6RBCXETWj)"}}

   Same body with "stream": true → HTTP 400 with a 0-byte body. That is why the client shows (no body) and why the failure is opaque to the user (related masking issue: #51530).

   Evidence that this is the same call_id store-miss

   1. Every tool call in the failing request was issued by the gateway. In the failing subagent, 15/15 tool_use ids are call_00_… ids returned by earlier gateway responses in the same session:

   call_00_isgefp3osjgl0fcpkd022y14  …  call_00_gr657gve2ujk5pm4nibxxs1k
   

   So this is not a client-invented id; the reasoning lookup should have hit.

   2. The client never replays thinking, and the gateway usually compensates. Claude Code's request history contains assistant tool_use turns with no thinking block at all (100% of tool-call turns in its transcripts). Most of these requests return 200 — reasoning is being backfilled server-side, same conclusion as your report.

   3. Identical bytes flap between 200 and 400 within minutes. A 67 KB reconstructed body (Anthropic format, stream: true, 52 messages) sent repeatedly:

   08:26:08Z  400, 400, 200, 400   (4 attempts)
   08:30Z     200 × 10             (same bytes, no changes)
   08:36Z     200 × 8
   

   This matches the store-miss/TTL pattern described here, and also matches #51201 ("identical bytes replay 200/400/200").

   4. Blast radius. On this machine it killed 8 of 25 dynamic-workflow subagents (32%) inside one 20-minute window, all with the same 400; outside that window, none. Claude Code does not retry it: its retry predicate is 408 / 409 / 429 / 5xx / x-should-retry: true, so a single 400 terminates the subagent and the orchestration script gets null instead of the result. Because every subagent shares the parent X-Claude-Code-Session-Id, one store-miss keeps failing on subsequent turns of the same session (we saw 4 consecutive failures over 11 s on one conversation).

   Asks

   1. On the gateway side, could 65871f21-0908-4a0f-bc02-89f7c5fb6d1f / 202610270826085305488478268d9d6RBCXETWj be checked against the reasoning store? Specifically whether the Anthropic route keys the store the same way (call_id from tool_use.id) and whether those entries were evicted (TTL, session-affinity change between calls).
   2. Return a JSON error body on streaming requests too — a 0-byte 400 is indistinguishable from a bad request generated client-side, and it hides exactly the information needed to report this.
   3. If the store miss is expected to happen, an internal single retry (or re-injecting empty reasoning with the correct shape) on the gateway would turn a hard subagent failure into a slow turn.