fix(kimi-coding): normalize anthropic tool payload format

src/agents/pi-embedded-runner-extraparams.test.ts

@@ -497,6 +497,116 @@ describe("applyExtraParamsToAgent", () => {
     expect(payloads[0]?.thinking).toEqual({ type: "disabled" });
   });
 
+  it("normalizes kimi-coding anthropic tools to OpenAI function format", () => {
+    const payloads: Record<string, unknown>[] = [];
+    const baseStreamFn: StreamFn = (_model, _context, options) => {
+      const payload: Record<string, unknown> = {
+        tools: [
+          {
+            name: "read",
+            description: "Read file",
+            input_schema: {
+              type: "object",
+              properties: { path: { type: "string" } },
+              required: ["path"],
+            },
+          },
+          {
+            type: "function",
+            function: {
+              name: "exec",
+              description: "Run command",
+              parameters: { type: "object", properties: {} },
+            },
+          },
+        ],
+        tool_choice: { type: "tool", name: "read" },
+      };
+      options?.onPayload?.(payload);
+      payloads.push(payload);
+      return {} as ReturnType<StreamFn>;
+    };
+    const agent = { streamFn: baseStreamFn };
+
+    applyExtraParamsToAgent(agent, undefined, "kimi-coding", "k2p5", undefined, "low");
+
+    const model = {
+      api: "anthropic-messages",
+      provider: "kimi-coding",
+      id: "k2p5",
+      baseUrl: "https://api.kimi.com/coding/",
+    } as Model<"anthropic-messages">;
+    const context: Context = { messages: [] };
+    void agent.streamFn?.(model, context, {});
+
+    expect(payloads).toHaveLength(1);
+    expect(payloads[0]?.tools).toEqual([
+      {
+        type: "function",
+        function: {
+          name: "read",
+          description: "Read file",
+          parameters: {
+            type: "object",
+            properties: { path: { type: "string" } },
+            required: ["path"],
+          },
+        },
+      },
+      {
+        type: "function",
+        function: {
+          name: "exec",
+          description: "Run command",
+          parameters: { type: "object", properties: {} },
+        },
+      },
+    ]);
+    expect(payloads[0]?.tool_choice).toEqual({
+      type: "function",
+      function: { name: "read" },
+    });
+  });
+
+  it("does not rewrite anthropic tool schema for non-kimi endpoints", () => {
+    const payloads: Record<string, unknown>[] = [];
+    const baseStreamFn: StreamFn = (_model, _context, options) => {
+      const payload: Record<string, unknown> = {
+        tools: [
+          {
+            name: "read",
+            description: "Read file",
+            input_schema: { type: "object", properties: {} },
+          },
+        ],
+      };
+      options?.onPayload?.(payload);
+      payloads.push(payload);
+      return {} as ReturnType<StreamFn>;
+    };
+    const agent = { streamFn: baseStreamFn };
+
+    applyExtraParamsToAgent(agent, undefined, "anthropic", "claude-sonnet-4-6", undefined, "low");
+
+    const model = {
+      api: "anthropic-messages",
+      provider: "anthropic",
+      id: "claude-sonnet-4-6",
+      baseUrl: "https://api.anthropic.com",
+    } as Model<"anthropic-messages">;
+    const context: Context = { messages: [] };
+    void agent.streamFn?.(model, context, {});
+
+    expect(payloads).toHaveLength(1);
+    expect(payloads[0]?.tools).toEqual([
+      {
+        name: "read",
+        description: "Read file",
+        input_schema: { type: "object", properties: {} },
+      },
+    ]);
+  });
+
   it("removes invalid negative Google thinkingBudget and maps Gemini 3.1 to thinkingLevel", () => {
     const payloads: Record<string, unknown>[] = [];
     const baseStreamFn: StreamFn = (_model, _context, options) => {