Rebuilt how AI Studio knows what a model can do (#960)

app/MindWork AI Studio/Models/Google/GeminiFamily.cs

@@ -0,0 +1,91 @@
+using static AIStudio.Provider.Capability;
+
+namespace AIStudio.Models.Google;
+
+/// <summary>
+/// The Gemini chat models.
+/// </summary>
+/// <remarks>
+/// A Gemini reads everything -- text, images, audio, speech, video -- writes text, and calls tools.
+/// That is the first rule, and it is the family's own fallback for a Gemini nobody has written a
+/// rule for yet. What the generations add to it is how they think, and the older exceptions take
+/// something away instead.
+///
+/// Every generation gets a line of its own, including the dotted ones. The dot is a version
+/// boundary rather than a name part boundary, deliberately -- it is what keeps llama3 and llama3.1
+/// apart -- so a rule for "gemini-3" does not answer for "gemini-3.1", and each has to say so
+/// itself. The previous rules searched for "gemini-3" anywhere in the name and covered unreleased
+/// versions by accident; the price of not doing that is a line per generation, and the verification
+/// run names any model of the corpus which finds no rule.
+/// </remarks>
+public sealed class GeminiFamily : ModelFamily
+{
+    /// <inheritdoc />
+    public override ModelVendor Vendor => ModelVendor.GOOGLE;
+
+    /// <inheritdoc />
+    public override ModelSource Source => new("https://ai.google.dev/gemini-api/docs/gemini-3", new DateOnly(2026, 9, 12), "Capabilities ported unchanged from ProviderExtensions.Google.cs: one shape for all of Gemini, one sentence per generation about thinking. The Gemini 3 guide states a one million token input window; the 2.5 model pages state their input limit as 1,048,576, and both numbers are written here as their page gives them.");
+
+    /// <inheritdoc />
+    public override IReadOnlyList<ModelSource> FurtherSources =>
+    [
+        new("https://ai.google.dev/gemini-api/docs/image-understanding", new DateOnly(2026, 9, 12), "States one number for the whole family: \"Gemini models support a maximum of 3,600 image files per request.\" The 20 MB it also names is a limit on the request body rather than on the number of images."),
+        new("https://ai.google.dev/gemini-api/docs/tokens", new DateOnly(2026, 9, 12), "Google publishes no tokenizer file for Gemini. Counting happens through the countTokens method of the API, which returns the number of tokens of the input alone.")
+    ];
+
+    /// <inheritdoc />
+    protected override void Declare(ModelFamilyBuilder builder)
+    {
+        //
+        // Google states the image limit once, for all of Gemini, so it sits on the fallback and
+        // every generation inherits it. The two rules below which do not inherit from here say
+        // nothing about it: the live model looks at no still images at all, and for the 1.0 vision
+        // model Google's current pages state no number any more.
+        //
+        builder.Rule("gemini").AsSegment()
+            .Capabilities(TEXT_INPUT | MULTIPLE_IMAGE_INPUT | AUDIO_INPUT | SPEECH_INPUT | VIDEO_INPUT | TEXT_OUTPUT | FUNCTION_CALLING)
+            .Apis(CHAT_COMPLETION_API)
+            .Images(maxPerRequest: 3_600)
+            .Tokenizer(TokenizerKind.PROVIDER_API, "countTokens");
+
+        // The one Gemini which only ever read text and images:
+        builder.Rule("gemini-1.0-pro-vision").AsPrefix()
+            .Capabilities(TEXT_INPUT | MULTIPLE_IMAGE_INPUT | TEXT_OUTPUT)
+            .Apis(CHAT_COMPLETION_API);
+
+        //
+        // The live model, which belongs to a different API: it speaks back, and it is the one
+        // Gemini that does not look at still images.
+        //
+        builder.Rule("gemini-2.0-flash-live").AsPrefix()
+            .Capabilities(TEXT_INPUT | AUDIO_INPUT | SPEECH_INPUT | VIDEO_INPUT | TEXT_OUTPUT | SPEECH_OUTPUT | FUNCTION_CALLING)
+            .Apis(CHAT_COMPLETION_API);
+
+        //
+        // Google states an input limit and an output limit rather than one window. The input limit
+        // is the one a conversation is measured against, because that is where the conversation
+        // accumulates, so that is the number written here.
+        //
+        builder.Rule("gemini-2.5").AsPrefix().InheritsFrom("gemini")
+            .Reasoning(ReasoningSupport.ALWAYS)
+            .ContextWindow(1_048_576);
+
+        //
+        // The one exception of the 2.5 line: it can think, but only when asked. From the 3.x line
+        // on, even the Flash Lite models think at their lowest level.
+        //
+        builder.Rule("gemini-2.5-flash-lite").AsPrefix().InheritsFrom("gemini-2.5")
+            .Reasoning(ReasoningSupport.OPTIONAL);
+
+        builder.Rule("gemini-3").AsPrefix().InheritsFrom("gemini")
+            .Reasoning(ReasoningSupport.ALWAYS)
+            .ContextWindow(1_000_000);
+
+        builder.Rule("gemini-3.1").AsPrefix().InheritsFrom("gemini-3");
+        builder.Rule("gemini-3.7").AsPrefix().InheritsFrom("gemini-3");
+
+        // The two rolling aliases, which carry no version number and point at the current line:
+        builder.Rule("gemini-flash-latest").AsExact().InheritsFrom("gemini-3");
+        builder.Rule("gemini-pro-latest").AsExact().InheritsFrom("gemini-3");
+    }
+}