feat(image_gen): add FAL Nano Banana 2 model

plugins/image_gen/fal/__init__.py

@@ -87,7 +87,7 @@ class FalImageGenProvider(ImageGenProvider):
         return {
             "name": "FAL.ai",
             "badge": "paid",
-            "tag": "Pick from flux-2-klein, flux-2-pro, gpt-image, nano-banana, etc. — text-to-image & image editing",
+            "tag": "Pick from flux-2-klein, flux-2-pro, gpt-image, nano-banana-2, nano-banana-pro, etc. — text-to-image & image editing",
             "env_vars": [
                 {
                     "key": "FAL_KEY",

plugins/image_gen/fal/plugin.yaml

@@ -1,6 +1,6 @@
 name: fal
 version: 1.0.0
-description: "FAL.ai image generation backend (flux-2-klein, flux-2-pro, nano-banana, gpt-image-1.5, recraft-v3, etc.)."
+description: "FAL.ai image generation backend (flux-2-klein, flux-2-pro, nano-banana-2, nano-banana-pro, gpt-image-1.5, recraft-v3, etc.)."
 author: NousResearch
 kind: backend
 requires_env:

tests/tools/test_image_generation.py

@@ -37,6 +37,14 @@ class TestFalCatalog:
         assert image_tool.DEFAULT_MODEL == "fal-ai/flux-2/klein/9b"
 
 
+    def test_nano_banana_2_in_catalog(self, image_tool):
+        meta = image_tool.FAL_MODELS["fal-ai/nano-banana-2"]
+
+        assert meta["display"] == "Nano Banana 2 (Gemini 3.1 Flash Image)"
+        assert meta["size_style"] == "aspect_ratio"
+        assert meta["edit_endpoint"] == "fal-ai/nano-banana-2/edit"
+        assert meta["max_reference_images"] == 14
+
     def test_all_entries_have_required_keys(self, image_tool):
         required = {
             "display", "speed", "strengths", "price",
@@ -91,6 +99,24 @@ class TestAspectRatioFamily:
         p = image_tool._build_fal_payload("fal-ai/nano-banana-pro", "hello", "portrait")
         assert p["aspect_ratio"] == "9:16"
 
+    def test_nano_banana_2_uses_aspect_ratio_and_flash_defaults(self, image_tool):
+        p = image_tool._build_fal_payload("fal-ai/nano-banana-2", "hello", "landscape")
+
+        assert p["aspect_ratio"] == "16:9"
+        assert p["resolution"] == "1K"
+        assert p["limit_generations"] is True
+        assert "image_size" not in p
+
+    def test_nano_banana_2_allows_thinking_level(self, image_tool):
+        p = image_tool._build_fal_payload(
+            "fal-ai/nano-banana-2",
+            "hello",
+            "square",
+            overrides={"thinking_level": "minimal"},
+        )
+
+        assert p["thinking_level"] == "minimal"
+
 
 class TestGptLiteralFamily:
     """GPT-Image 1.5 uses literal size strings."""

tools/image_generation_tool.py

@@ -220,6 +220,40 @@ FAL_MODELS: Dict[str, Dict[str, Any]] = {
         },
         "max_reference_images": 2,
     },
+    "fal-ai/nano-banana-2": {
+        "display": "Nano Banana 2 (Gemini 3.1 Flash Image)",
+        "speed": "~3s",
+        "strengths": "Fast reasoning, multilingual text, infographics",
+        "price": "Lower-cost Flash tier",
+        "size_style": "aspect_ratio",
+        "sizes": {
+            "landscape": "16:9",
+            "square": "1:1",
+            "portrait": "9:16",
+        },
+        "defaults": {
+            "num_images": 1,
+            "output_format": "png",
+            "safety_tolerance": "4",
+            "resolution": "1K",
+            "limit_generations": True,
+        },
+        "supports": {
+            "prompt", "aspect_ratio", "num_images", "output_format",
+            "safety_tolerance", "seed", "sync_mode", "system_prompt",
+            "resolution", "enable_web_search", "limit_generations",
+            "thinking_level",
+        },
+        "upscale": False,
+        "edit_endpoint": "fal-ai/nano-banana-2/edit",
+        "edit_supports": {
+            "prompt", "image_urls", "aspect_ratio", "num_images",
+            "output_format", "safety_tolerance", "seed", "sync_mode",
+            "system_prompt", "resolution", "enable_web_search",
+            "limit_generations", "thinking_level",
+        },
+        "max_reference_images": 14,
+    },
     "fal-ai/gpt-image-1.5": {
         "display": "GPT Image 1.5",
         "speed": "~15s",