diff --git a/src/main/java/io/github/ollama4j/OllamaAPI.java b/src/main/java/io/github/ollama4j/OllamaAPI.java
index 0c89888..3421b1c 100644
--- a/src/main/java/io/github/ollama4j/OllamaAPI.java
+++ b/src/main/java/io/github/ollama4j/OllamaAPI.java
@@ -774,11 +774,15 @@ public class OllamaAPI {
         } else {
             result = requestCaller.callSync(request);
         }
+
+        //add registered Tools to Request
+
+
         return new OllamaChatResult(result.getResponse(), result.getResponseTime(), result.getHttpStatusCode(), request.getMessages());
     }
 
     public void registerTool(Tools.ToolSpecification toolSpecification) {
-        toolRegistry.addFunction(toolSpecification.getFunctionName(), toolSpecification.getToolDefinition());
+        toolRegistry.addTool(toolSpecification.getFunctionName(), toolSpecification);
     }
 
     /**
@@ -871,7 +875,7 @@ public class OllamaAPI {
         try {
             String methodName = toolFunctionCallSpec.getName();
             Map<String, Object> arguments = toolFunctionCallSpec.getArguments();
-            ToolFunction function = toolRegistry.getFunction(methodName);
+            ToolFunction function = toolRegistry.getToolFunction(methodName);
             if (verbose) {
                 logger.debug("Invoking function {} with arguments {}", methodName, arguments);
             }
diff --git a/src/main/java/io/github/ollama4j/models/chat/OllamaChatRequest.java b/src/main/java/io/github/ollama4j/models/chat/OllamaChatRequest.java
index e6e528d..5d19703 100644
--- a/src/main/java/io/github/ollama4j/models/chat/OllamaChatRequest.java
+++ b/src/main/java/io/github/ollama4j/models/chat/OllamaChatRequest.java
@@ -3,6 +3,7 @@ package io.github.ollama4j.models.chat;
 import java.util.List;
 
 import io.github.ollama4j.models.request.OllamaCommonRequest;
+import io.github.ollama4j.tools.Tools;
 import io.github.ollama4j.utils.OllamaRequestBody;
 
 import lombok.Getter;
@@ -21,6 +22,8 @@ public class OllamaChatRequest extends OllamaCommonRequest implements OllamaRequ
 
   private List<OllamaChatMessage> messages;
 
+  private List<Tools.PromptFuncDefinition> tools;
+
   public OllamaChatRequest() {}
 
   public OllamaChatRequest(String model, List<OllamaChatMessage> messages) {
diff --git a/src/main/java/io/github/ollama4j/tools/ToolRegistry.java b/src/main/java/io/github/ollama4j/tools/ToolRegistry.java
index 2ead13a..bb504c6 100644
--- a/src/main/java/io/github/ollama4j/tools/ToolRegistry.java
+++ b/src/main/java/io/github/ollama4j/tools/ToolRegistry.java
@@ -4,13 +4,14 @@ import java.util.HashMap;
 import java.util.Map;
 
 public class ToolRegistry {
-    private final Map<String, ToolFunction> functionMap = new HashMap<>();
+    private final Map<String, Tools.ToolSpecification> tools = new HashMap<>();
 
-    public ToolFunction getFunction(String name) {
-        return functionMap.get(name);
+    public ToolFunction getToolFunction(String name) {
+        final Tools.ToolSpecification toolSpecification = tools.get(name);
+        return toolSpecification !=null ? toolSpecification.getToolFunction() : null ;
     }
 
-    public void addFunction(String name, ToolFunction function) {
-        functionMap.put(name, function);
+    public void addTool (String name, Tools.ToolSpecification specification) {
+        tools.put(name, specification);
     }
 }
diff --git a/src/main/java/io/github/ollama4j/tools/Tools.java b/src/main/java/io/github/ollama4j/tools/Tools.java
index 986302f..eb8dcca 100644
--- a/src/main/java/io/github/ollama4j/tools/Tools.java
+++ b/src/main/java/io/github/ollama4j/tools/Tools.java
@@ -6,8 +6,10 @@ import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.core.JsonProcessingException;
 import io.github.ollama4j.utils.Utils;
+import lombok.AllArgsConstructor;
 import lombok.Builder;
 import lombok.Data;
+import lombok.NoArgsConstructor;
 
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -20,17 +22,23 @@ public class Tools {
     public static class ToolSpecification {
         private String functionName;
         private String functionDescription;
-        private Map<String, PromptFuncDefinition.Property> properties;
-        private ToolFunction toolDefinition;
+        private PromptFuncDefinition toolPrompt;
+        private ToolFunction toolFunction;
     }
 
     @Data
     @JsonIgnoreProperties(ignoreUnknown = true)
+    @Builder
+    @NoArgsConstructor
+    @AllArgsConstructor
     public static class PromptFuncDefinition {
         private String type;
         private PromptFuncSpec function;
 
         @Data
+        @Builder
+        @NoArgsConstructor
+        @AllArgsConstructor
         public static class PromptFuncSpec {
             private String name;
             private String description;
@@ -38,6 +46,9 @@ public class Tools {
         }
 
         @Data
+        @Builder
+        @NoArgsConstructor
+        @AllArgsConstructor
         public static class Parameters {
             private String type;
             private Map<String, Property> properties;
@@ -46,6 +57,8 @@ public class Tools {
 
         @Data
         @Builder
+        @NoArgsConstructor
+        @AllArgsConstructor
         public static class Property {
             private String type;
             private String description;
@@ -94,10 +107,10 @@ public class Tools {
 
             PromptFuncDefinition.Parameters parameters = new PromptFuncDefinition.Parameters();
             parameters.setType("object");
-            parameters.setProperties(spec.getProperties());
+            parameters.setProperties(spec.getToolPrompt().getFunction().parameters.getProperties());
 
             List<String> requiredValues = new ArrayList<>();
-            for (Map.Entry<String, PromptFuncDefinition.Property> p : spec.getProperties().entrySet()) {
+            for (Map.Entry<String, PromptFuncDefinition.Property> p : spec.getToolPrompt().getFunction().getParameters().getProperties().entrySet()) {
                 if (p.getValue().isRequired()) {
                     requiredValues.add(p.getKey());
                 }