Fix model fallback across main/background/sync agents

src/plugin/chat-params.test.ts

@@ -0,0 +1,38 @@
+import { describe, expect, test } from "bun:test"
+
+import { createChatParamsHandler } from "./chat-params"
+
+describe("createChatParamsHandler", () => {
+  test("normalizes object-style agent payload and runs chat.params hooks", async () => {
+    //#given
+    let called = false
+    const handler = createChatParamsHandler({
+      anthropicEffort: {
+        "chat.params": async (input) => {
+          called = input.agent.name === "sisyphus"
+        },
+      },
+    })
+
+    const input = {
+      sessionID: "ses_chat_params",
+      agent: { name: "sisyphus" },
+      model: { providerID: "opencode", modelID: "claude-opus-4-6" },
+      provider: { id: "opencode" },
+      message: {},
+    }
+
+    const output = {
+      temperature: 0.1,
+      topP: 1,
+      topK: 1,
+      options: {},
+    }
+
+    //#when
+    await handler(input, output)
+
+    //#then
+    expect(called).toBe(true)
+  })
+})