Fixed answers breaking off after an invalid tool call (#1036)

app/MindWork AI Studio/Tools/ToolCallingSystem/ToolExecutor.cs

@@ -48,6 +48,20 @@ public sealed class ToolExecutor(ToolSettingsService toolSettingsService, ILogge
         }
     }
 
+    /// <summary>
+    /// Whether a function name consists of 1 to 64 ASCII letters, digits, underscores, or hyphens.
+    /// </summary>
+    /// <remarks>
+    /// The rule OpenAI states for function names. Our own definitions have to meet it to be offered
+    /// at all, and every name a model returned has to meet it to be sent back in the conversation:
+    /// vLLM checks the calls of the history with exactly this rule when it serves a Mistral model,
+    /// and it rejects the whole request over a single name which breaks it.
+    /// </remarks>
+    public static bool IsValidFunctionName(string? functionName) =>
+        !string.IsNullOrWhiteSpace(functionName) &&
+        functionName.Length <= 64 &&
+        functionName.All(character => char.IsAsciiLetterOrDigit(character) || character is '_' or '-');
+
     public async Task<ToolCallOutcome> ExecuteAsync(
         string toolCallId,
         string toolName,

app/MindWork AI Studio/Tools/ToolCallingSystem/ToolRegistry.cs

@@ -193,7 +193,7 @@ public sealed class ToolRegistry
             return false;
         }
 
-        if (!IsValidFunctionName(definition.Function.Name))
+        if (!ToolExecutor.IsValidFunctionName(definition.Function.Name))
         {
             issue = "the function name must contain 1-64 ASCII letters, digits, underscores, or hyphens";
             return false;
@@ -279,11 +279,6 @@ public sealed class ToolRegistry
         return true;
     }
 
-    private static bool IsValidFunctionName(string? functionName) =>
-        !string.IsNullOrWhiteSpace(functionName) &&
-        functionName.Length <= 64 &&
-        functionName.All(character => char.IsAsciiLetterOrDigit(character) || character is '_' or '-');
-
     public IReadOnlyList<ToolDefinition> GetDefinitionsForComponent(Components component)
     {
         return this.definitionsById.Values