try this

Author: derfred

mistral-ai-ruby.gemspec

@@ -26,8 +26,8 @@ Gem::Specification.new do |spec|
         f.start_with?(*%w[bin/ test/ spec/ features/ .git .circleci appveyor Gemfile])
     end
   end
-  spec.bindir = "bin"
-  spec.executables = spec.files.grep(%r{\Abin/}) { |f| File.basename(f) }
+  spec.bindir        = "bin"
+  spec.executables   = ["mistral-chat"]
   spec.require_paths = ["lib"]
 
   # Core dependencies