Bug: V2 session titles include model commentary #51997

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1. github-actions

   assigned

   jlongster

   on Sep 29, 2026
2. github-actions commented on Sep 29, 2026

   

   github-actionsBot

   on Sep 29, 2026 – with GitHub Actions

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   ---

   This issue might be a duplicate of an existing issue. Please check:

   • #948: Generated titles sometimes include response text instead of being concise titles, causing non-title model output to appear in the saved session title.
3. shanebishop1 commented on Sep 29, 2026

   

   shanebishop1

   on Sep 29, 2026

   ContributorAuthor

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   #52006 addresses this
4. opencodejr commented on Oct 28, 2026

   

   opencodejrBot

   on Oct 28, 2026

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   Thanks for the clear report. I reproduced this on 2.0.18, and it still happens on the latest dev (86ce19d).

   Steps: I pointed OpenCode at a local mock OpenAI Responses server that returns two messages for every request. The first has phase: "commentary" (We need title only. Need capture investigation. Title concise.) and the second has phase: "final_answer" (Read-only performance investigation). I used the mock as the session model and the title model, ran opencode run "Do a read-only performance investigation across several machines", and checked opencode session list. The saved title was:

   We need title only. Need capture investigation. Title concise.Read-only performance investigation

   The commentary and the final answer are joined with no separator, so the first-line selection doesn't separate them either. The expected title is just Read-only performance investigation. The script below reproduces it with the CLI.

   Related: your PR #52006 (excludes commentary-phase text), #57071 (strips inline reasoning blocks from titles) and #54185 (models replying conversationally instead of giving a title, which has a different cause).

   Reproduction script (repro.sh)

   #!/usr/bin/env bash
   # Reproduces anomalyco/opencode#51997 with the CLI and a mock OpenAI Responses server.
   # Usage: ./repro.sh            -> uses `opencode` on PATH
   #        OC_DEV=/path/to/repo ./repro.sh -> runs the CLI from a source checkout
   set -euo pipefail
   WORK="$(mktemp -d /tmp/opencode/repro-51997.XXXX)"
   mkdir -p "$WORK/project" "$WORK/config" "$WORK/home"
   cat > "$WORK/mock.ts" <<'TS'
   // Mock OpenAI Responses server: every reply has a 'commentary' message then a 'final_answer' message.
   const COMMENTARY = "We need title only. Need capture investigation. Title concise."
   const FINAL = "Read-only performance investigation"
   const sse = (events: object[]) => events.map((e) => `data: ${JSON.stringify(e)}\n\n`).join("")
   const message = (id: string, phase: string, text: string, seq: { n: number }, index: number) => {
     const item = { id, type: "message", role: "assistant", status: "completed", phase, content: [{ type: "output_text", text, annotations: [] }] }
     return [
       { type: "response.output_item.added", output_index: index, sequence_number: seq.n++, item: { ...item, status: "in_progress", content: [] } },
       { type: "response.content_part.added", item_id: id, output_index: index, content_index: 0, sequence_number: seq.n++, part: { type: "output_text", text: "", annotations: [] } },
       { type: "response.output_text.delta", item_id: id, output_index: index, content_index: 0, sequence_number: seq.n++, delta: text },
       { type: "response.output_text.done", item_id: id, output_index: index, content_index: 0, sequence_number: seq.n++, text },
       { type: "response.output_item.done", output_index: index, sequence_number: seq.n++, item },
     ]
   }
   
   const requests: string[] = []
   const server = Bun.serve({
     port: 0,
     async fetch(req) {
       requests.push(`${req.method} ${new URL(req.url).pathname}`)
       await req.text()
       const seq = { n: 0 }
       const resp = { id: "resp_1", object: "response", status: "in_progress", model: "gpt-6-luna", output: [] }
       const body = sse([
         { type: "response.created", sequence_number: seq.n++, response: resp },
         ...message("msg_commentary", "commentary", COMMENTARY, seq, 0),
         ...message("msg_final", "final_answer", FINAL, seq, 1),
         {
           type: "response.completed",
           sequence_number: seq.n++,
           response: { ...resp, status: "completed", usage: { input_tokens: 10, output_tokens: 10, total_tokens: 20 } },
         },
       ])
       return new Response(body, { headers: { "content-type": "text/event-stream" } })
     },
   })
   console.log(`MOCK_PORT=${server.port}`)
   TS
   bun "$WORK/mock.ts" > "$WORK/mock.log" 2>&1 &
   MOCK=$!
   trap 'kill $MOCK 2>/dev/null || true' EXIT
   for _ in $(seq 50); do grep -q MOCK_PORT "$WORK/mock.log" && break; sleep 0.1; done
   PORT=$(sed -n 's/MOCK_PORT=//p' "$WORK/mock.log")
   cat > "$WORK/config/opencode.jsonc" <<JSON
   {
     "model": "mock/gpt-6-luna",
     "autoupdate": false,
     "providers": {
       "mock": {
         "name": "Mock OpenAI",
         "package": "@opencode-ai/ai/providers/openai/responses",
         "settings": { "apiKey": "mock-key", "baseURL": "http://127.0.0.1:$PORT/v1" },
         "models": {
           "gpt-6-luna": {
             "name": "GPT-6 Luna (mock)",
             "capabilities": { "tools": true, "input": ["text"], "output": ["text"] },
             "limit": { "context": 128000, "output": 16000 }
           }
         }
       }
     },
     "agents": { "title": { "model": { "providerID": "mock", "model": "gpt-6-luna" } } }
   }
   JSON
   export OPENCODE_CONFIG_DIR="$WORK/config" HOME="$WORK/home" XDG_DATA_HOME="$WORK/home/.local/share" XDG_CONFIG_HOME="$WORK/home/.config" XDG_STATE_HOME="$WORK/home/.local/state" XDG_CACHE_HOME="$WORK/home/.cache"
   if [ -n "${OC_DEV:-}" ]; then
     # the standalone server child process needs the opentui preload too; bunfig.toml in cwd provides it
     printf 'preload = ["%s"]\n' "$OC_DEV/packages/tui/node_modules/@opentui/solid/scripts/preload.js" > "$WORK/project/bunfig.toml"
     oc() { bun --conditions=browser --preload="$OC_DEV/packages/tui/node_modules/@opentui/solid/scripts/preload.js" "$OC_DEV/packages/cli/src/index.ts" "$@"; }
   else
     oc() { opencode "$@"; }
   fi
   cd "$WORK/project"
   echo "version: $(oc --version)"
   oc run --standalone "Do a read-only performance investigation across several machines" || true
   sleep 3
   echo "--- sessions ---"
   oc session list --standalone 2>&1 || oc session list 2>&1 || true
   echo "--- mock requests ---"; cat "$WORK/mock.log"

   Run it: bash repro.sh

   👍React with 👍1Reacted by Shane Bishop
5. opencodejr

   added

   reproduced

   on Oct 28, 2026
6. Tarquinen

   closed this as completedin #62267on Nov 7, 2026