cli: default_agent=plan appends plan-mode reminder as a synthetic turn after the first response #58287

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1. opencode-agent commented on Oct 23, 2026

   

   opencode-agentBot

   on Oct 23, 2026 – with OpenCode Agent

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   Thanks for the detailed report. I reproduced this on 2.1.3, and it still happens on the latest dev (53730daad5).

   I used a mock OpenAI-compatible provider that always replies PROBE_C, set "default_agent": "plan" in the global config, and ran opencode run --model mock/m "Reply with exactly PROBE_C and do not use any tools.":

   • Without --agent: the CLI printed PROBE_C twice. The model got a second request, user prompt → assistant: PROBE_C → plan-mode reminder. It ends on the reminder alone, so the model starts a turn no one asked for.
   • With --agent plan: one request, with the reminder before the prompt, and one reply.

   The script below reproduces it. As you found, passing --agent plan explicitly avoids it for now. Related: #57013, where a plan-mode reminder also ends up as the last user turn, after a mid-turn agent switch.

   Reproduction script (repro.sh)

   #!/usr/bin/env bash
   # Repro for #58287: default_agent=plan makes `opencode run` generate a second, unprompted turn.
   # Usage: ./repro.sh            (uses `opencode` from PATH)
   #        OC_DEV=/path/to/opencode ./repro.sh   (runs from a source checkout)
   set -u
   WORK=$(mktemp -d); PORT=${PORT:-18787}
   mkdir -p "$WORK/home/.config/opencode" "$WORK/project"
   LOG="$WORK/requests.log"
   # Mock OpenAI-compatible server: every chat completion replies "PROBE_C", and logs each request.
   cat > "$WORK/mock.ts" <<'TS'
   const log = process.env.LOG!
   let n = 0
   Bun.serve({ port: Number(process.env.PORT), async fetch(req) {
     const url = new URL(req.url)
     if (!url.pathname.endsWith("/chat/completions")) return new Response("{}", { headers: { "content-type": "application/json" } })
     const body: any = await req.json()
     n++
     const tail = body.messages.map((m: any) => {
       const c = typeof m.content === "string" ? m.content : JSON.stringify(m.content)
       return `${m.role}:${c.includes("You are in Plan mode") ? "[PLAN-REMINDER]" : c.slice(0, 60).replace(/\n/g, " ")}`
     }).filter((s: string) => !s.startsWith("system:"))
     await Bun.write(log, (await Bun.file(log).exists() ? await Bun.file(log).text() : "") + `REQUEST ${n}: ${tail.join(" | ")}\n`)
     const chunk = (d: any) => `data: ${JSON.stringify({ id: "x", object: "chat.completion.chunk", created: 0, model: "m", choices: [d] })}\n\n`
     const text = `PROBE_C`
     return new Response(chunk({ index: 0, delta: { role: "assistant", content: text } }) + chunk({ index: 0, delta: {}, finish_reason: "stop" }) + "data: [DONE]\n\n", { headers: { "content-type": "text/event-stream" } })
   } })
   TS
   LOG=$LOG PORT=$PORT bun "$WORK/mock.ts" & MOCK=$!
   sleep 1
   cat > "$WORK/home/.config/opencode/opencode.jsonc" <<JSON
   {
     "\$schema": "https://opencode.ai/config.json",
     "default_agent": "plan",
     "providers": {
       "mock": {
         "package": "@opencode/ai/providers/openai-compatible",
         "env": ["MOCK_API_KEY"],
         "settings": { "baseURL": "http://127.0.0.1:$PORT/v1" },
         "models": { "m": { "name": "Mock" } }
       }
     }
   }
   JSON
   if [ -n "${OC_DEV:-}" ]; then
     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 "$WORK/project" && git init -q
   # The source CLI respawns its server as plain `bun <entry>`; a bunfig keeps the Solid preload for it.
   [ -n "${OC_DEV:-}" ] && printf 'preload = ["%s"]\n' "$OC_DEV/packages/tui/node_modules/@opentui/solid/scripts/preload.js" > bunfig.toml
   export HOME="$WORK/home" XDG_CONFIG_HOME="$WORK/home/.config" XDG_DATA_HOME="$WORK/home/.local/share" XDG_STATE_HOME="$WORK/home/.local/state" XDG_CACHE_HOME="$WORK/home/.cache" MOCK_API_KEY=x
   echo "version: $("${OC[@]}" --version)"
   for agent in "" "--agent plan"; do
     rm -f "$LOG"
     echo "=== opencode run ${agent:-(no --agent, default_agent=plan)} ==="
     timeout 90 "${OC[@]}" run $agent --model mock/m "Reply with exactly PROBE_C and do not use any tools." 2>&1 | tail -n 20
     echo "--- model requests ---"; cat "$LOG"
   done
   kill $MOCK

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

   added

   reproduced

   on Oct 23, 2026
3. OrangerXu

   added a commit that references this issue on Oct 27, 2026

   fix(plugin): yield the prompt-hook registration so the reminder actua…

   ...

   cb7650c