Say at the model where Codestral cannot be chatted with

app/MindWork AI Studio/Models/Mistral/CodestralFamily.cs

@@ -1,3 +1,5 @@
+using AIStudio.Provider;
+
 using static AIStudio.Provider.Capability;
 
 namespace AIStudio.Models.Mistral;
@@ -10,6 +12,12 @@ namespace AIStudio.Models.Mistral;
 /// words the Mistral block looked for, so it walked past every rule and reached the answer meant
 /// for everything nobody had written one for. That answer happened to describe it correctly, which
 /// is why nothing looked wrong -- and is exactly the situation this rebuild is meant to end.
+///
+/// That Mistral serves it to fill in the middle of a file rather than to talk to was the one thing
+/// the rebuild left behind: it stayed in the Mistral provider, as a name check which dropped every
+/// model whose ID begins with "code". It says something about a model, so it belongs to the model,
+/// and it is bound to the provider because it is only true there. Somebody's own server and the
+/// gateways serve the same weights to chat with, which is what the unbound rule above keeps saying.
 /// </remarks>
 public sealed class CodestralFamily : ModelFamily
 {
@@ -17,11 +25,22 @@ public sealed class CodestralFamily : ModelFamily
     public override ModelVendor Vendor => ModelVendor.MISTRAL_AI;
 
     /// <inheritdoc />
-    public override ModelSource Source => new("https://docs.mistral.ai/getting-started/models/models_overview/", new DateOnly(2026, 9, 11), "The answer the previous rules gave it through their fallback: text in, text out, tool calling.");
+    public override ModelSource Source => new("https://docs.mistral.ai/getting-started/models/models_overview/", new DateOnly(2026, 9, 19), "The answer the previous rules gave it through their fallback: text in, text out, tool calling. What Mistral's own catalog makes of it was read from the same page, where Codestral is the model behind the FIM endpoint.");
 
     /// <inheritdoc />
-    protected override void Declare(ModelFamilyBuilder builder) =>
+    protected override void Declare(ModelFamilyBuilder builder)
+    {
         builder.Rule("codestral").AsSegment()
             .Capabilities(TEXT_INPUT | TEXT_OUTPUT | FUNCTION_CALLING)
             .Apis(CHAT_COMPLETION_API);
+
+        //
+        // Bound to Mistral, which makes it the more specific of the two and lets it win there
+        // without anybody writing an order. It continues a text instead of answering in a
+        // conversation, so it must not stand among the models somebody picks for a chat.
+        //
+        builder.Rule("codestral").AsSegment().OnlyOn(LLMProviders.MISTRAL)
+            .Inherits()
+            .Kind(ModelKind.TEXT_COMPLETION);
+    }
 }

app/Tests/Models/Corpus/CapabilitySnapshot.txt

@@ -115,7 +115,7 @@ LITE_LLM | anthropic/claude-sonnet-5 | CHAT_COMPLETION_API, FUNCTION_CALLING, MU
 LITE_LLM | azure/gpt-5.6 | CHAT_COMPLETION_API, FUNCTION_CALLING, MULTIPLE_IMAGE_INPUT, REASONING_BY_DEFAULT, TEXT_INPUT, TEXT_OUTPUT, WEB_SEARCH | CHAT | 1050000 | (unknown) | TIKTOKEN o200k_base
 LITE_LLM | bedrock/anthropic.claude-3-5-sonnet-20241022-v2:0 | CHAT_COMPLETION_API, FUNCTION_CALLING, TEXT_INPUT, TEXT_OUTPUT | CHAT | (unknown) | (unknown) | (unknown)
 LITE_LLM | the-fast-one | CHAT_COMPLETION_API, FUNCTION_CALLING, TEXT_INPUT, TEXT_OUTPUT | CHAT | (unknown) | (unknown) | (unknown)
-MISTRAL | codestral-2508 | CHAT_COMPLETION_API, FUNCTION_CALLING, TEXT_INPUT, TEXT_OUTPUT | CHAT | (unknown) | (unknown) | (unknown)
+MISTRAL | codestral-2508 | CHAT_COMPLETION_API, FUNCTION_CALLING, TEXT_INPUT, TEXT_OUTPUT | TEXT_COMPLETION | (unknown) | (unknown) | (unknown)
 MISTRAL | magistral-medium-2506 | ALWAYS_REASONING, CHAT_COMPLETION_API, FUNCTION_CALLING, MULTIPLE_IMAGE_INPUT, TEXT_INPUT, TEXT_OUTPUT | CHAT | (unknown) | (unknown) | (unknown)
 MISTRAL | ministral-14b-2512 | CHAT_COMPLETION_API, FUNCTION_CALLING, MULTIPLE_IMAGE_INPUT, TEXT_INPUT, TEXT_OUTPUT | CHAT | (unknown) | (unknown) | (unknown)
 MISTRAL | ministral-3b-latest | CHAT_COMPLETION_API, FUNCTION_CALLING, MULTIPLE_IMAGE_INPUT, TEXT_INPUT, TEXT_OUTPUT | CHAT | (unknown) | (unknown) | (unknown)

app/Tests/Models/Corpus/ModelKindCorpus.cs

@@ -33,6 +33,11 @@ public static class ModelKindCorpus
 
         // The one name whose only marker used to be the organization it was published under:
         new(SELF_HOSTED, "sentence-transformers/all-MiniLM-L6-v2", EMBEDDING),
+
+        // Mistral's embedding checkpoint for code. It carries the name of a family which is a text
+        // completion model on this very provider, and stays an embedding model regardless: what a
+        // model is for is said by the word which says it, not by the family it was built from.
+        new(MISTRAL, "codestral-embed", EMBEDDING),
     ];
 
     /// <summary>
@@ -128,13 +133,18 @@ public static class ModelKindCorpus
     ];
 
     /// <summary>
-    /// The models from before chat completions existed.
+    /// The models which continue a text instead of answering in a conversation.
     /// </summary>
     private static readonly ModelKindExample[] TEXT_COMPLETION_ENTRIES =
     [
         new(HELMHOLTZ, "text-davinci-003", TEXT_COMPLETION),
         new(OPEN_AI, "babbage-002", TEXT_COMPLETION),
         new(OPEN_AI, "gpt-3.5-turbo-instruct", TEXT_COMPLETION),
+
+        // The one of these which is not old: Mistral serves Codestral to fill in the middle of a
+        // file. It says so only for Mistral's own catalog, which is why the open weights of the
+        // same name stay a chat model further down.
+        new(MISTRAL, "codestral-latest", TEXT_COMPLETION),
     ];
 
     /// <summary>
@@ -179,6 +189,11 @@ public static class ModelKindCorpus
         new(SELF_HOSTED, "llama3.3:70b", CHAT),
         new(OPEN_AI, "gpt-5.1", CHAT),
 
+        // The open weights of the model Mistral itself serves to fill in the middle of a file.
+        // Whoever runs them runs them behind a chat completion API, so here the name means
+        // something to talk to -- which is what binding that other rule to Mistral protects.
+        new(SELF_HOSTED, "codestral-22b-v0.1", CHAT),
+
         //
         // Three which were questioned while testing and stay all the same. Grok Build is the coding
         // model behind the xAI CLI and answers like any other Grok. The Groq compound systems are