core: fix model selection in title generation to use user's model instead of assistant's

Author: thdxr

packages/opencode/src/session/summary.ts

@@ -74,19 +74,17 @@ export namespace SessionSummary {
     }
     await Session.updateMessage(userMsg)
 
-    const assistantMsg = messages.find((m) => m.info.role === "assistant")!.info as MessageV2.Assistant
-    const small =
-      (await Provider.getSmallModel(assistantMsg.providerID)) ??
-      (await Provider.getModel(assistantMsg.providerID, assistantMsg.modelID))
-
     const textPart = msgWithParts.parts.find((p) => p.type === "text" && !p.synthetic) as MessageV2.TextPart
     if (textPart && !userMsg.summary?.title) {
       const agent = await Agent.get("title")
       const stream = await LLM.stream({
         agent,
         user: userMsg,
         tools: {},
-        model: agent.model ? await Provider.getModel(agent.model.providerID, agent.model.modelID) : small,
+        model: agent.model
+          ? await Provider.getModel(agent.model.providerID, agent.model.modelID)
+          : ((await Provider.getSmallModel(userMsg.model.providerID)) ??
+            (await Provider.getModel(userMsg.model.providerID, userMsg.model.modelID))),
         small: true,
         messages: [
           {
@@ -109,49 +107,6 @@ export namespace SessionSummary {
       userMsg.summary.title = result
       await Session.updateMessage(userMsg)
     }
-
-    if (
-      messages.some(
-        (m) =>
-          m.info.role === "assistant" && m.parts.some((p) => p.type === "step-finish" && p.reason !== "tool-calls"),
-      )
-    ) {
-      if (diffs.length > 0) {
-        for (const msg of messages) {
-          for (const part of msg.parts) {
-            if (part.type === "tool" && part.state.status === "completed") {
-              part.state.output = "[TOOL OUTPUT PRUNED]"
-            }
-          }
-        }
-        const summaryAgent = await Agent.get("summary")
-        const stream = await LLM.stream({
-          agent: summaryAgent,
-          user: userMsg,
-          tools: {},
-          model: summaryAgent.model
-            ? await Provider.getModel(summaryAgent.model.providerID, summaryAgent.model.modelID)
-            : small,
-          small: true,
-          messages: [
-            ...MessageV2.toModelMessage(messages),
-            {
-              role: "user" as const,
-              content: `Summarize the above conversation according to your system prompts.`,
-            },
-          ],
-          abort: new AbortController().signal,
-          sessionID: userMsg.sessionID,
-          system: [],
-          retries: 3,
-        })
-        const result = await stream.text
-        if (result) {
-          userMsg.summary.body = result
-        }
-      }
-      await Session.updateMessage(userMsg)
-    }
   }
 
   export const diff = fn(