test(image-generation): tighten zhipu provider coverage

docs/configuration.md

@@ -1195,7 +1195,7 @@ If you want to always use the local conversion, you can force it using:
 
 ## Image Generation
 
-Image generation is configured under `tools.imageGeneration` and uses provider credentials from `providers.openrouter` or `providers.aihubmix`.
+Image generation is configured under `tools.imageGeneration` and uses credentials from the selected provider's `providers.<name>` block.
 
 See [Image Generation](./image-generation.md) for WebUI usage, provider examples, artifact storage, and troubleshooting.
 

docs/image-generation.md

@@ -255,7 +255,7 @@ Supported aspect ratios: `1:1`, `16:9`, `9:16`, `3:4`, `4:3`. Sizes can be speci
 {
   "providers": {
     "zhipu": {
-      "apiKey": "${ZHIPU_API_KEY}"
+      "apiKey": "${ZAI_API_KEY}"
     }
   },
   "tools": {
@@ -328,4 +328,3 @@ Use the reference image. Keep the same robot and composition, change the palette
 | AIHubMix says `Incorrect model ID` | Use `model: "gpt-image-2-free"`; nanobot expands it to the required `openai/gpt-image-2-free` model path internally |
 | Generation times out | Try a smaller/default image size, set AIHubMix `extraBody.quality` to `"low"`, or retry later |
 | Reference image rejected | Reference image paths must be inside the workspace or nanobot media directory and must be valid image files |
-

nanobot/providers/image_generation.py

@@ -1504,7 +1504,6 @@ class ZhipuImageGenerationClient(ImageGenerationProvider):
             "prompt": prompt,
         }
 
-        # Resolve size
         size = _zhipu_size(aspect_ratio, image_size)
         if size:
             body["size"] = size
@@ -1517,10 +1516,6 @@ class ZhipuImageGenerationClient(ImageGenerationProvider):
         try:
             return await self._generate_with_client(
                 client,
-                prompt=prompt,
-                model=model,
-                aspect_ratio=aspect_ratio,
-                image_size=image_size,
                 headers=headers,
                 body=body,
                 url=url,
@@ -1533,10 +1528,6 @@ class ZhipuImageGenerationClient(ImageGenerationProvider):
         self,
         client: httpx.AsyncClient,
         *,
-        prompt: str,
-        model: str,
-        aspect_ratio: str | None,
-        image_size: str | None,
         headers: dict[str, str],
         body: dict[str, Any],
         url: str,

tests/tools/test_image_generation_tool.py

@@ -172,16 +172,7 @@ async def test_generate_image_tool_allows_ollama_without_api_key(
 
 
 @pytest.mark.asyncio
-async def test_generate_image_tool_allows_zhipu_without_api_key(
-    tmp_path: Path,
-    monkeypatch: pytest.MonkeyPatch,
-) -> None:
-    set_config_path(tmp_path / "config.json")
-    FakeImageClient.instances = []
-    monkeypatch.setattr(
-        "nanobot.agent.tools.image_generation.get_image_gen_provider",
-        lambda name: FakeImageClient if name == "zhipu" else None,
-    )
+async def test_generate_image_tool_reports_missing_zhipu_key(tmp_path: Path) -> None:
     tool = ImageGenerationTool(
         workspace=tmp_path,
         config=ImageGenerationToolConfig(
@@ -194,14 +185,7 @@ async def test_generate_image_tool_allows_zhipu_without_api_key(
 
     result = await tool.execute(prompt="draw a cat")
 
-    payload = json.loads(result)
-    assert len(payload["artifacts"]) == 1
-
-    fake = FakeImageClient.instances[0]
-    assert fake.kwargs["api_key"] is None
-    assert fake.kwargs["api_base"] == "https://open.bigmodel.cn/api/paas/v4"
-    assert fake.calls[0]["aspect_ratio"] == "1:1"
-    assert fake.calls[0]["image_size"] == "1K"
+    assert result.startswith("Error: Zhipu API key is not configured")
 
 
 @pytest.mark.asyncio