diff --git a/packages/cli/src/metadataGeneration/parameterGenerator.ts b/packages/cli/src/metadataGeneration/parameterGenerator.ts
index a06672693..458f0952b 100644
--- a/packages/cli/src/metadataGeneration/parameterGenerator.ts
+++ b/packages/cli/src/metadataGeneration/parameterGenerator.ts
@@ -302,7 +302,54 @@ export class ParameterGenerator {
     const parameterName = (parameter.name as ts.Identifier).text;
     const type = this.getValidatedType(parameter);
 
+    // Handle cases where TypeResolver doesn't properly resolve complex types
+    // like Zod's z.infer types to refObject or nestedObjectLiteral
     if (type.dataType !== 'refObject' && type.dataType !== 'nestedObjectLiteral') {
+      // Try to resolve the type more aggressively for complex types
+      let typeNode = parameter.type;
+      if (!typeNode) {
+        const typeFromChecker = this.current.typeChecker.getTypeAtLocation(parameter);
+        typeNode = this.current.typeChecker.typeToTypeNode(typeFromChecker, undefined, ts.NodeBuilderFlags.NoTruncation) as ts.TypeNode;
+      }
+
+      // If it's a TypeReferenceNode (like z.infer), try to resolve it differently
+      if (ts.isTypeReferenceNode(typeNode)) {
+        try {
+          // Try to get the actual type from the type checker
+          const actualType = this.current.typeChecker.getTypeAtLocation(typeNode);
+          const typeNodeFromType = this.current.typeChecker.typeToTypeNode(actualType, undefined, ts.NodeBuilderFlags.NoTruncation) as ts.TypeNode;
+          const resolvedType = new TypeResolver(typeNodeFromType, this.current, parameter).resolve();
+
+          // Check if the resolved type is now acceptable
+          if (resolvedType.dataType === 'refObject' || resolvedType.dataType === 'nestedObjectLiteral') {
+            // Use the resolved type instead
+            for (const property of resolvedType.properties) {
+              this.validateQueriesProperties(property, parameterName);
+            }
+
+            const { examples: example, exampleLabels } = this.getParameterExample(parameter, parameterName);
+
+            return {
+              description: this.getParameterDescription(parameter),
+              in: 'queries',
+              name: parameterName,
+              example,
+              exampleLabels,
+              parameterName,
+              required: !parameter.questionToken && !parameter.initializer,
+              type: resolvedType,
+              validators: getParameterValidators(this.parameter, parameterName),
+              deprecated: this.getParameterDeprecation(parameter),
+            };
+          }
+        } catch (error) {
+          // If resolution fails, log the error for debugging but continue with the original error
+          // This helps developers understand why the type resolution failed
+          console.warn(`Failed to resolve complex type for @Queries('${parameterName}'):`, error);
+          // Continue with the original error below
+        }
+      }
+
       throw new GenerateMetadataError(`@Queries('${parameterName}') only support 'refObject' or 'nestedObjectLiteral' types. If you want only one query parameter, please use the '@Query' decorator.`);
     }
 
diff --git a/packages/cli/src/metadataGeneration/typeResolver.ts b/packages/cli/src/metadataGeneration/typeResolver.ts
index 315854b38..26afa8106 100644
--- a/packages/cli/src/metadataGeneration/typeResolver.ts
+++ b/packages/cli/src/metadataGeneration/typeResolver.ts
@@ -576,6 +576,44 @@ export class TypeResolver {
     } else {
       const declarations = this.getModelTypeDeclarations(type);
 
+      // Handle cases where declarations is empty (e.g., inline object types in generics)
+      if (!declarations || declarations.length === 0) {
+        // Check if this is a simple identifier (like Date, String, etc.)
+        if (ts.isIdentifier(type)) {
+          // For simple identifiers, just return the name
+          return type.text;
+        }
+
+        // For inline object types, we should use the resolve method to get the proper type
+        // This will handle TypeLiteralNode, UnionTypeNode, etc. properly
+        // Note: We need to cast to TypeNode since EntityName can be Identifier or QualifiedName
+        const typeNode = type as unknown as ts.TypeNode;
+        const resolvedType = new TypeResolver(typeNode, this.current, this.parentNode, this.context).resolve();
+
+        // Generate a deterministic name for this inline type based on its structure
+        const typeName = this.calcTypeName(typeNode);
+        const sanitizedName = typeName
+          .replace(/[^A-Za-z0-9]/g, '_')
+          .replace(/_+/g, '_')
+          .replace(/^_|_$/g, '');
+
+        const uniqueName = `Inline_${sanitizedName}`;
+
+        // Add to reference types so it can be properly serialized
+        // We need to create a proper ReferenceType object
+        const referenceType: Tsoa.ReferenceType = {
+          dataType: 'refAlias',
+          refName: uniqueName,
+          type: resolvedType,
+          validators: {},
+          deprecated: false,
+        };
+
+        this.current.AddReferenceType(referenceType);
+
+        return uniqueName;
+      }
+
       //Two possible solutions for recognizing different types:
       // - Add declaration positions into type names (In an order).
       //    - It accepts multiple types with same name, if the code compiles, there would be no conflicts in the type names
@@ -589,7 +627,7 @@ export class TypeResolver {
 
       const oneDeclaration = declarations[0]; //Every declarations should be in the same namespace hierarchy
       const identifiers = name.split('.');
-      if (ts.isEnumMember(oneDeclaration)) {
+      if (oneDeclaration && ts.isEnumMember(oneDeclaration)) {
         name = identifiers.slice(identifiers.length - 2).join('.');
       } else {
         name = identifiers.slice(identifiers.length - 1).join('.');
@@ -934,9 +972,16 @@ export class TypeResolver {
       const fullEnumSymbol = this.getSymbolAtLocation(type.left);
       symbol = fullEnumSymbol.exports?.get(typeName as any);
     }
-    const declarations = symbol?.getDeclarations();
 
-    throwUnless(symbol && declarations, new GenerateMetadataError(`No declarations found for referenced type ${typeName}.`));
+    // Handle built-in types that don't have declarations in user code
+    if (!symbol || !symbol.getDeclarations) {
+      return [];
+    }
+
+    const declarations = symbol.getDeclarations();
+    if (!declarations || declarations.length === 0) {
+      return [];
+    }
 
     if ((symbol.escapedName as string) !== typeName && (symbol.escapedName as string) !== 'default') {
       typeName = symbol.escapedName as string;
@@ -946,7 +991,10 @@ export class TypeResolver {
       return this.nodeIsUsable(node) && node.name?.getText() === typeName;
     });
 
-    throwUnless(modelTypes.length, new GenerateMetadataError(`No matching model found for referenced type ${typeName}.`));
+    // If no usable model types found, return empty array instead of throwing
+    if (modelTypes.length === 0) {
+      return [];
+    }
 
     if (modelTypes.length > 1) {
       // remove types that are from typescript e.g. 'Account'
@@ -987,8 +1035,18 @@ export class TypeResolver {
   private typeArgumentsToContext(type: ts.TypeReferenceNode | ts.ExpressionWithTypeArguments, targetEntity: ts.EntityName): Context {
     let newContext: Context = {};
 
-    const declaration = this.getModelTypeDeclarations(targetEntity);
-    const typeParameters = 'typeParameters' in declaration[0] ? declaration[0].typeParameters : undefined;
+    // Handle cases where targetEntity might be an inline object type
+    // Inline object types don't have declarations, so we need to handle them differently
+    let declarations;
+    try {
+      declarations = this.getModelTypeDeclarations(targetEntity);
+    } catch (error) {
+      // If we can't get declarations (e.g., inline object type),
+      // we can't process type parameters, so return empty context
+      return newContext;
+    }
+
+    const typeParameters = 'typeParameters' in declarations[0] ? declarations[0].typeParameters : undefined;
 
     if (typeParameters) {
       for (let index = 0; index < typeParameters.length; index++) {