diff --git a/instrumentation-genai/opentelemetry-instrumentation-vertexai/src/opentelemetry/instrumentation/vertexai/utils.py b/instrumentation-genai/opentelemetry-instrumentation-vertexai/src/opentelemetry/instrumentation/vertexai/utils.py
index 3221cdf9bc..6b280d2bc4 100644
--- a/instrumentation-genai/opentelemetry-instrumentation-vertexai/src/opentelemetry/instrumentation/vertexai/utils.py
+++ b/instrumentation-genai/opentelemetry-instrumentation-vertexai/src/opentelemetry/instrumentation/vertexai/utils.py
@@ -56,7 +56,7 @@
     FinishReason,
     MessagePart,
     Text,
-    ToolCall,
+    ToolCallRequest,
     ToolCallResponse,
 )
 from opentelemetry.util.genai.utils import get_content_capturing_mode
@@ -341,7 +341,7 @@ def convert_content_to_message_parts(
         elif "function_call" in part:
             part = part.function_call
             parts.append(
-                ToolCall(
+                ToolCallRequest(
                     id=f"{part.name}_{idx}",
                     name=part.name,
                     arguments=json_format.MessageToDict(
diff --git a/instrumentation-genai/opentelemetry-instrumentation-vertexai/tests/requirements.oldest.txt b/instrumentation-genai/opentelemetry-instrumentation-vertexai/tests/requirements.oldest.txt
index 7bfd62ff5f..74b2738541 100644
--- a/instrumentation-genai/opentelemetry-instrumentation-vertexai/tests/requirements.oldest.txt
+++ b/instrumentation-genai/opentelemetry-instrumentation-vertexai/tests/requirements.oldest.txt
@@ -69,7 +69,8 @@ opentelemetry-api==1.37
 opentelemetry-sdk==1.37
 opentelemetry-semantic-conventions==0.58b0
 opentelemetry-instrumentation==0.58b0
-opentelemetry-util-genai[upload]==0.2b0
+# opentelemetry-util-genai[upload]==0.2b0
+-e util/opentelemetry-util-genai[upload]
 fsspec==2025.9.0
 
 -e instrumentation-genai/opentelemetry-instrumentation-vertexai[instruments]
diff --git a/util/opentelemetry-util-genai/CHANGELOG.md b/util/opentelemetry-util-genai/CHANGELOG.md
index f64092a697..fa0ad2d7a9 100644
--- a/util/opentelemetry-util-genai/CHANGELOG.md
+++ b/util/opentelemetry-util-genai/CHANGELOG.md
@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+- Enrich ToolCall type ([#4218](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4218))
+
 ## Version 0.3b0 (2026-02-20)
 
 - Add `gen_ai.tool_definitions` to completion hook ([#4181](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4181))
diff --git a/util/opentelemetry-util-genai/src/opentelemetry/util/genai/types.py b/util/opentelemetry-util-genai/src/opentelemetry/util/genai/types.py
index 045a65b372..e37d0bdf6a 100644
--- a/util/opentelemetry-util-genai/src/opentelemetry/util/genai/types.py
+++ b/util/opentelemetry-util-genai/src/opentelemetry/util/genai/types.py
@@ -42,7 +42,7 @@ class ContentCapturingMode(Enum):
 
 
 @dataclass()
-class ToolCall:
+class ToolCallRequest:
     """Represents a tool call requested by the model
 
     This model is specified as part of semconv in `GenAI messages Python models - ToolCallRequestPart
@@ -55,6 +55,40 @@ class ToolCall:
     type: Literal["tool_call"] = "tool_call"
 
 
+@dataclass()
+class ToolCall(ToolCallRequest):
+    """Represents a tool call for execution tracking with spans and metrics.
+
+    This type extends ToolCallRequest with additional fields for tracking tool execution
+    per the execute_tool span semantic conventions.
+
+    Reference: https://github.com/open-telemetry/semantic-conventions/blob/main/docs/gen-ai/gen-ai-spans.md#execute-tool-span
+
+    For simple message parts (tool calls requested by the model), consider using
+    ToolCallRequest instead to avoid unnecessary execution-tracking fields.
+
+    Semantic convention attributes for execute_tool spans:
+    - gen_ai.operation.name: "execute_tool" (Required)
+    - gen_ai.tool.name: Name of the tool (Recommended)
+    - gen_ai.tool.call.id: Tool call identifier (Recommended if available)
+    - gen_ai.tool.type: Type classification - "function", "extension", or "datastore" (Recommended if available)
+    - gen_ai.tool.description: Tool description (Recommended if available)
+    - gen_ai.tool.call.arguments: Parameters passed to tool (Opt-In, may contain sensitive data)
+    - gen_ai.tool.call.result: Result returned by tool (Opt-In, may contain sensitive data)
+    - error.type: Error type if operation failed (Conditionally Required)
+    """
+
+    # Execution-only fields (used for execute_tool spans):
+    # gen_ai.tool.type - Tool type: "function", "extension", or "datastore"
+    tool_type: str | None = None
+    # gen_ai.tool.description - Description of what the tool does
+    tool_description: str | None = None
+    # gen_ai.tool.call.result - Result returned by the tool (Opt-In, may contain sensitive data)
+    tool_result: Any = None
+    # error.type - Error type if the tool call failed
+    error_type: str | None = None
+
+
 @dataclass()
 class ToolCallResponse:
     """Represents a tool call result sent to the model or a built-in tool call outcome and details
@@ -158,7 +192,15 @@ class GenericToolDefinition:
 ToolDefinition = Union[FunctionToolDefinition, GenericToolDefinition]
 
 MessagePart = Union[
-    Text, ToolCall, ToolCallResponse, Blob, File, Uri, Reasoning, Any
+    Text,
+    ToolCallRequest,
+    ToolCall,
+    ToolCallResponse,
+    Blob,
+    File,
+    Uri,
+    Reasoning,
+    Any,
 ]
 
 
diff --git a/util/opentelemetry-util-genai/tests/test_toolcall.py b/util/opentelemetry-util-genai/tests/test_toolcall.py
new file mode 100644
index 0000000000..a06f39efdd
--- /dev/null
+++ b/util/opentelemetry-util-genai/tests/test_toolcall.py
@@ -0,0 +1,165 @@
+# Copyright The OpenTelemetry Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Tests for ToolCallRequest and ToolCall types"""
+
+import pytest
+
+from opentelemetry.util.genai.types import (
+    InputMessage,
+    OutputMessage,
+    ToolCall,
+    ToolCallRequest,
+)
+
+
+def test_toolcallrequest_basic():
+    """Test basic ToolCallRequest instantiation"""
+    tcr = ToolCallRequest(arguments=None, name="get_weather", id=None)
+    assert tcr.name == "get_weather"
+    assert tcr.type == "tool_call"
+    assert tcr.arguments is None
+    assert tcr.id is None
+
+
+def test_toolcallrequest_with_all_fields():
+    """Test ToolCallRequest with all fields"""
+    tcr = ToolCallRequest(
+        name="get_weather",
+        arguments={"location": "Paris"},
+        id="call_123",
+    )
+    assert tcr.name == "get_weather"
+    assert tcr.arguments == {"location": "Paris"}
+    assert tcr.id == "call_123"
+    assert tcr.type == "tool_call"
+
+
+def test_toolcallrequest_in_message():
+    """Test ToolCallRequest works as message part"""
+    tcr = ToolCallRequest(
+        arguments={"location": "Paris"}, name="get_weather", id=None
+    )
+    msg = InputMessage(role="user", parts=[tcr])
+    assert len(msg.parts) == 1
+    assert msg.parts[0] == tcr
+
+
+def test_toolcall_inherits_from_toolcallrequest():
+    """Test that ToolCall inherits from ToolCallRequest"""
+    tc = ToolCall(arguments=None, name="get_weather", id=None)
+    assert isinstance(tc, ToolCallRequest)
+    assert isinstance(tc, ToolCall)
+
+
+def test_toolcall_has_execution_fields():
+    """Test ToolCall has execution-only fields"""
+    tc = ToolCall(arguments=None, name="get_weather", id=None)
+    assert hasattr(tc, "tool_type")
+    assert hasattr(tc, "tool_description")
+    assert hasattr(tc, "tool_result")
+    assert hasattr(tc, "error_type")
+
+
+def test_toolcall_execution_fields_default_none():
+    """Test ToolCall execution fields default to None"""
+    tc = ToolCall(arguments=None, name="get_weather", id=None)
+    assert tc.tool_type is None
+    assert tc.tool_description is None
+    assert tc.tool_result is None
+    assert tc.error_type is None
+
+
+def test_toolcall_with_execution_fields():
+    """Test ToolCall with execution fields set"""
+    tc = ToolCall(
+        name="get_weather",
+        arguments={"location": "Paris"},
+        id="call_123",
+        tool_type="function",
+        tool_description="Get current weather",
+        tool_result={"temp": 20, "condition": "sunny"},
+    )
+    assert tc.name == "get_weather"
+    assert tc.tool_type == "function"
+    assert tc.tool_description == "Get current weather"
+    assert tc.tool_result == {"temp": 20, "condition": "sunny"}
+
+
+def test_toolcall_with_error():
+    """Test ToolCall with error_type set"""
+    tc = ToolCall(
+        arguments={"location": "Invalid"},
+        name="get_weather",
+        id=None,
+        error_type="InvalidLocationError",
+    )
+    assert tc.error_type == "InvalidLocationError"
+    assert tc.tool_result is None
+
+
+def test_toolcall_backward_compatibility():
+    """Test ToolCall still works as message part (backward compatibility)"""
+    tc = ToolCall(
+        name="get_weather",
+        arguments={"location": "Paris"},
+        id="call_123",
+    )
+    # Should work in messages
+    msg = InputMessage(role="user", parts=[tc])
+    assert len(msg.parts) == 1
+
+    # Should work in output messages
+    out_msg = OutputMessage(
+        role="assistant", parts=[tc], finish_reason="tool_calls"
+    )
+    assert len(out_msg.parts) == 1
+
+
+def test_toolcallrequest_no_execution_fields():
+    """Test that ToolCallRequest doesn't have execution fields"""
+    tcr = ToolCallRequest(arguments=None, name="get_weather", id=None)
+    # ToolCallRequest should only have message part fields
+    assert not hasattr(tcr, "tool_type")
+    assert not hasattr(tcr, "tool_description")
+    assert not hasattr(tcr, "tool_result")
+    assert not hasattr(tcr, "error_type")
+
+
+def test_mixed_types_in_message():
+    """Test using both ToolCallRequest and ToolCall in messages"""
+    tcr = ToolCallRequest(arguments=None, name="simple_tool", id=None)
+    tc = ToolCall(
+        arguments=None, name="complex_tool", id=None, tool_type="function"
+    )
+
+    msg = InputMessage(role="user", parts=[tcr, tc])
+    assert len(msg.parts) == 2
+    assert isinstance(msg.parts[0], ToolCallRequest)
+    assert isinstance(msg.parts[1], ToolCall)
+    # ToolCall is also a ToolCallRequest
+    assert isinstance(msg.parts[1], ToolCallRequest)
+
+
+def test_toolcall_tool_type_values():
+    """Test valid tool_type values"""
+    for tool_type in ["function", "extension", "datastore"]:
+        tc = ToolCall(
+            arguments=None, name="test", id=None, tool_type=tool_type
+        )
+        assert tc.tool_type == tool_type
+
+
+if __name__ == "__main__":
+    pytest.main([__file__, "-v"])
diff --git a/util/opentelemetry-util-genai/tests/test_upload.py b/util/opentelemetry-util-genai/tests/test_upload.py
index dd87b971e0..aa5fcb5b4a 100644
--- a/util/opentelemetry-util-genai/tests/test_upload.py
+++ b/util/opentelemetry-util-genai/tests/test_upload.py
@@ -44,7 +44,7 @@
     types.InputMessage(
         role="assistant",
         parts=[
-            types.ToolCall(
+            types.ToolCallRequest(
                 id="get_capital_0",
                 name="get_capital",
                 arguments={"city": "Paris"},