fix(ai): replayed Responses reasoning items are sent without id when the server's item ids have no prefix_suffix shape #55357

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1. opencode-agent commented on Oct 14, 2026

   

   opencode-agentBot

   on Oct 14, 2026 – with OpenCode Agent

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   Thanks for the detailed report. I reproduced this on 2.0.29, and it still happens on the latest dev (34d8ded0c5).

   Setup: a custom @ai-sdk/openai provider pointing at a mock Responses server. The mock issues bare ids (reasoning 8a482c218291d43b, message f00dbeef12345678) and, like your gateway, rejects reasoning input items that have no id. That rejection is mocked, as your report describes it; what I checked is the request OpenCode sends.

   • The first opencode run succeeds.
   • The second turn (opencode run -c) fails with JSON deserialization for type 'Responses.Input.ReasoningInputItem' was missing required properties including: 'id'.
   • In the captured request, the replayed reasoning item is {type: "reasoning", summary: [...], encrypted_content: null} with no id, and the assistant message's id is dropped too.

   This matches your analysis of itemID() in packages/ai/src/protocols/open-responses.ts. The id handling there was last changed in #44587. The script below reproduces it.

   Reproduction script (repro.sh)

   #!/usr/bin/env bash
   # Repro for #55357: replayed Responses reasoning items lose a bare (no "_") server id.
   # Mock Responses server issues ids like 8a482c218291d43b and, like the reporter's
   # gateway, rejects reasoning input items without `id` (spec marks it required).
   # Usage: ./repro.sh            (uses `opencode` on PATH)
   #        OC="bun ... packages/cli/src/index.ts" ./repro.sh   (run from source)
   set -u
   OC=${OC:-opencode}
   DIR=$(mktemp -d /tmp/opencode/repro55357.XXXX); cd "$DIR"
   cat > server.ts <<'TS'
   let n = 0
   Bun.serve({ port: 4555, async fetch(req) {
     const body = await req.json()
     n++
     await Bun.write(`req${n}.json`, JSON.stringify(body, null, 2))
     const bad = (body.input ?? []).filter((i: any) => i.type === "reasoning" && !i.id)
     if (bad.length) return new Response(JSON.stringify({ error: { message: "JSON deserialization for type 'Responses.Input.ReasoningInputItem' was missing required properties including: 'id'.", type: "invalid_request_error" } }), { status: 400, headers: { "content-type": "application/json" } })
     const rid = "8a482c218291d43b", mid = "f00dbeef12345678", resp = "resp" + n
     const ev = (o: any) => `event: ${o.type}\ndata: ${JSON.stringify(o)}\n\n`
     const base = { id: resp, object: "response", created_at: 1, model: "mock-reasoner", status: "in_progress", output: [] }
     const rItem = { id: rid, type: "reasoning", summary: [{ type: "summary_text", text: "thinking" }], encrypted_content: null }
     const mItem = { id: mid, type: "message", role: "assistant", status: "completed", content: [{ type: "output_text", text: "hello " + n, annotations: [] }] }
     const s = [
       ev({ type: "response.created", sequence_number: 0, response: base }),
       ev({ type: "response.output_item.added", sequence_number: 1, output_index: 0, item: { ...rItem, summary: [] } }),
       ev({ type: "response.reasoning_summary_part.added", sequence_number: 2, item_id: rid, output_index: 0, summary_index: 0, part: { type: "summary_text", text: "" } }),
       ev({ type: "response.reasoning_summary_text.delta", sequence_number: 3, item_id: rid, output_index: 0, summary_index: 0, delta: "thinking" }),
       ev({ type: "response.reasoning_summary_text.done", sequence_number: 4, item_id: rid, output_index: 0, summary_index: 0, text: "thinking" }),
       ev({ type: "response.reasoning_summary_part.done", sequence_number: 5, item_id: rid, output_index: 0, summary_index: 0, part: { type: "summary_text", text: "thinking" } }),
       ev({ type: "response.output_item.done", sequence_number: 6, output_index: 0, item: rItem }),
       ev({ type: "response.output_item.added", sequence_number: 7, output_index: 1, item: { ...mItem, status: "in_progress", content: [] } }),
       ev({ type: "response.content_part.added", sequence_number: 8, item_id: mid, output_index: 1, content_index: 0, part: { type: "output_text", text: "", annotations: [] } }),
       ev({ type: "response.output_text.delta", sequence_number: 9, item_id: mid, output_index: 1, content_index: 0, delta: "hello " + n }),
       ev({ type: "response.output_text.done", sequence_number: 10, item_id: mid, output_index: 1, content_index: 0, text: "hello " + n }),
       ev({ type: "response.content_part.done", sequence_number: 11, item_id: mid, output_index: 1, content_index: 0, part: mItem.content[0] }),
       ev({ type: "response.output_item.done", sequence_number: 12, output_index: 1, item: mItem }),
       ev({ type: "response.completed", sequence_number: 13, response: { ...base, status: "completed", output: [rItem, mItem], usage: { input_tokens: 5, output_tokens: 5, total_tokens: 10, output_tokens_details: { reasoning_tokens: 1 }, input_tokens_details: { cached_tokens: 0 } } } }),
     ].join("")
     return new Response(s, { headers: { "content-type": "text/event-stream" } })
   } })
   TS
   cat > opencode.json <<'JSON'
   { "$schema": "https://opencode.ai/config.json",
     "provider": { "gw": { "npm": "@ai-sdk/openai", "name": "Gateway",
       "options": { "baseURL": "http://127.0.0.1:4555/v1", "apiKey": "x" },
       "models": { "mock-reasoner": { "name": "mock", "reasoning": true } } } } }
   JSON
   bun server.ts & SRV=$!; sleep 1
   export XDG_DATA_HOME=$DIR/data XDG_CONFIG_HOME=$DIR/cfg XDG_STATE_HOME=$DIR/state XDG_CACHE_HOME=$DIR/cache
   # SERVE_CMD: optional command to start an opencode server separately (for running from source)
   export OPENCODE_PASSWORD=${OPENCODE_PASSWORD:-repro}
   if [ -n "${SERVE_CMD:-}" ]; then $SERVE_CMD serve --port 4777 >serve.log 2>&1 & OCS=$!; sleep 8; RUNARGS="--server http://127.0.0.1:4777"; else RUNARGS="--standalone"; fi
   $OC run $RUNARGS -m gw/mock-reasoner "first prompt"
   echo "---- second turn ----"
   $OC run $RUNARGS -c -m gw/mock-reasoner "second prompt"
   kill $SRV ${OCS:-}
   echo "---- reasoning input items in second request ----"
   for f in $(ls req*.json | sort -V); do echo "$f:"; bun -e 'const b=JSON.parse(await Bun.file(process.argv[1]).text()); console.log(JSON.stringify((b.input??[]).filter(i=>i.type==="reasoning"||i.role==="assistant"),null,1))' "$f"; done

   Run it: bash repro.sh
2. opencode-agent

   added

   reproduced

   on Oct 14, 2026
3. rekram1-node

   self-assigned this

   on Oct 18, 2026