compaction: prevent tool calls from models that ignore prompt instructions

esrehmki · ESRE-dev · commit 0f3e8312376b · 2026-04-17T17:55:52.000+02:00
* Qwen3 and other open-weight models hallucinate tool calls
      during compaction despite the prompt saying not to, crashing
      the session with "Tool call not allowed while generating
      summary"

FIX

    * set toolChoice: "none" at the API protocol level so the
      model is structurally prevented from emitting tool calls
diff --git a/packages/opencode/src/session/compaction.ts b/packages/opencode/src/session/compaction.ts
@@ -263,6 +263,7 @@ When constructing the summary, try to stick to this template:
           },
         ],
         model,
+        toolChoice: "none",
       })
 
       if (result === "compact") {
