diff --git a/instrumentation-genai/opentelemetry-instrumentation-anthropic/src/opentelemetry/instrumentation/anthropic/utils.py b/instrumentation-genai/opentelemetry-instrumentation-anthropic/src/opentelemetry/instrumentation/anthropic/utils.py
index 9914a55a22..7399b8831b 100644
--- a/instrumentation-genai/opentelemetry-instrumentation-anthropic/src/opentelemetry/instrumentation/anthropic/utils.py
+++ b/instrumentation-genai/opentelemetry-instrumentation-anthropic/src/opentelemetry/instrumentation/anthropic/utils.py
@@ -38,7 +38,7 @@
     MessagePart,
     Reasoning,
     Text,
-    ToolCall,
+    ToolCallRequest,
     ToolCallResponse,
 )
 
@@ -114,7 +114,7 @@ def _convert_dict_block_to_part(
 
     if block_type == "tool_use":
         inp = block.get("input")
-        return ToolCall(
+        return ToolCallRequest(
             arguments=inp if isinstance(inp, dict) else None,
             name=str(block.get("name", "")),
             id=str(block.get("id", "")),
@@ -144,7 +144,9 @@ def _convert_content_block_to_part(
         return Text(content=block.text)
 
     if isinstance(block, (ToolUseBlock, ServerToolUseBlock)):
-        return ToolCall(arguments=block.input, name=block.name, id=block.id)
+        return ToolCallRequest(
+            arguments=block.input, name=block.name, id=block.id
+        )
 
     if isinstance(block, (ThinkingBlock, RedactedThinkingBlock)):
         content = (
@@ -229,7 +231,7 @@ def stream_block_state_to_part(state: StreamBlockState) -> MessagePart | None:
                 arguments = json.loads(state.input_json)
             except ValueError:
                 arguments = state.input_json
-        return ToolCall(
+        return ToolCallRequest(
             arguments=arguments,
             name=state.tool_name,
             id=state.tool_id,
diff --git a/instrumentation-genai/opentelemetry-instrumentation-google-genai/pyproject.toml b/instrumentation-genai/opentelemetry-instrumentation-google-genai/pyproject.toml
index a63b28d8b4..87b30343e3 100644
--- a/instrumentation-genai/opentelemetry-instrumentation-google-genai/pyproject.toml
+++ b/instrumentation-genai/opentelemetry-instrumentation-google-genai/pyproject.toml
@@ -39,10 +39,10 @@ classifiers = [
   "Programming Language :: Python :: 3.14",
 ]
 dependencies = [
-  "opentelemetry-api ~=1.37",
-  "opentelemetry-instrumentation >=0.58b0, <2",
-  "opentelemetry-semantic-conventions >=0.58b0, <2",
-  "opentelemetry-util-genai >= 0.3b0, <0.4b0",
+  "opentelemetry-api ~=1.39",
+  "opentelemetry-instrumentation >=0.60b0, <2",
+  "opentelemetry-semantic-conventions >=0.60b0, <2",
+  "opentelemetry-util-genai >= 0.4b0.dev, <0.5b0",
 ]
 
 [project.optional-dependencies]
diff --git a/instrumentation-genai/opentelemetry-instrumentation-google-genai/src/opentelemetry/instrumentation/google_genai/message.py b/instrumentation-genai/opentelemetry-instrumentation-google-genai/src/opentelemetry/instrumentation/google_genai/message.py
index 29ef112a6f..a7349f0c83 100644
--- a/instrumentation-genai/opentelemetry-instrumentation-google-genai/src/opentelemetry/instrumentation/google_genai/message.py
+++ b/instrumentation-genai/opentelemetry-instrumentation-google-genai/src/opentelemetry/instrumentation/google_genai/message.py
@@ -15,20 +15,20 @@
 from __future__ import annotations
 
 import logging
-from dataclasses import dataclass
 from enum import Enum
-from typing import Literal
 
 from google.genai import types as genai_types
 
 from opentelemetry.util.genai.types import (
+    Blob,
     FinishReason,
     InputMessage,
     MessagePart,
     OutputMessage,
     Text,
-    ToolCall,
+    ToolCallRequest,
     ToolCallResponse,
+    Uri,
 )
 
 
@@ -39,23 +39,6 @@ class Role(str, Enum):
     TOOL = "tool"
 
 
-@dataclass
-class BlobPart:
-    data: bytes
-    mime_type: str
-    type: Literal["blob"] = "blob"
-
-
-@dataclass
-class FileDataPart:
-    mime_type: str
-    uri: str
-    type: Literal["file_data"] = "file_data"
-
-    class Config:
-        extra = "allow"
-
-
 _logger = logging.getLogger(__name__)
 
 
@@ -121,16 +104,26 @@ def tool_call_id(name: str | None) -> str:
     if (text := part.text) is not None:
         return Text(content=text)
 
-    if data := part.inline_data:
-        return BlobPart(mime_type=data.mime_type or "", data=data.data or b"")
+    if inline_data := part.inline_data:
+        mime_type = inline_data.mime_type or ""
+        modality = mime_type.split("/")[0] if mime_type else ""
+        return Blob(
+            mime_type=mime_type,
+            modality=modality,
+            content=inline_data.data or b"",
+        )
 
-    if data := part.file_data:
-        return FileDataPart(
-            mime_type=data.mime_type or "", uri=data.file_uri or ""
+    if file_data := part.file_data:
+        mime_type = file_data.mime_type or ""
+        modality = mime_type.split("/")[0] if mime_type else ""
+        return Uri(
+            mime_type=mime_type,
+            modality=modality,
+            uri=file_data.file_uri or "",
         )
 
     if call := part.function_call:
-        return ToolCall(
+        return ToolCallRequest(
             id=call.id or tool_call_id(call.name),
             name=call.name or "",
             arguments=call.args,
diff --git a/instrumentation-genai/opentelemetry-instrumentation-google-genai/tests/requirements.oldest.txt b/instrumentation-genai/opentelemetry-instrumentation-google-genai/tests/requirements.oldest.txt
index 357bbeccb3..092a723ec4 100644
--- a/instrumentation-genai/opentelemetry-instrumentation-google-genai/tests/requirements.oldest.txt
+++ b/instrumentation-genai/opentelemetry-instrumentation-google-genai/tests/requirements.oldest.txt
@@ -21,11 +21,11 @@ pytest-vcr==1.0.2
 
 google-auth==2.15.0
 google-genai==1.32.0
-opentelemetry-api==1.37.0
-opentelemetry-sdk==1.37.0
-opentelemetry-semantic-conventions==0.58b0
-opentelemetry-instrumentation==0.58b0
-opentelemetry-util-genai[upload]==0.3b0
+opentelemetry-api==1.39.0
+opentelemetry-sdk==1.39.0
+opentelemetry-semantic-conventions==0.60b0
+opentelemetry-instrumentation==0.60b0
+-e util/opentelemetry-util-genai[upload]
 
 fsspec==2025.9.0
 
diff --git a/instrumentation-genai/opentelemetry-instrumentation-langchain/src/opentelemetry/instrumentation/langchain/callback_handler.py b/instrumentation-genai/opentelemetry-instrumentation-langchain/src/opentelemetry/instrumentation/langchain/callback_handler.py
index 8f642567ca..d694857da4 100644
--- a/instrumentation-genai/opentelemetry-instrumentation-langchain/src/opentelemetry/instrumentation/langchain/callback_handler.py
+++ b/instrumentation-genai/opentelemetry-instrumentation-langchain/src/opentelemetry/instrumentation/langchain/callback_handler.py
@@ -14,7 +14,7 @@
 
 from __future__ import annotations
 
-from typing import Any, Optional
+from typing import Any, Optional, cast
 from uuid import UUID
 
 from langchain_core.callbacks import BaseCallbackHandler
@@ -29,6 +29,7 @@
     Error,
     InputMessage,
     LLMInvocation,
+    MessagePart,
     OutputMessage,
     Text,
 )
@@ -133,7 +134,11 @@ def on_chat_model_start(
                                     Text(content=text_value, type="text")
                                 )
 
-                input_messages.append(InputMessage(parts=parts, role=role))
+                input_messages.append(
+                    InputMessage(
+                        parts=cast(list[MessagePart], parts), role=role
+                    )
+                )
 
         llm_invocation = LLMInvocation(
             request_model=request_model,
@@ -206,7 +211,7 @@ def on_llm_end(
                     role = chat_generation.message.type
                     output_message = OutputMessage(
                         role=role,
-                        parts=parts,
+                        parts=cast(list[MessagePart], parts),
                         finish_reason=finish_reason,
                     )
                     output_messages.append(output_message)
diff --git a/instrumentation-genai/opentelemetry-instrumentation-openai-v2/src/opentelemetry/instrumentation/openai_v2/patch.py b/instrumentation-genai/opentelemetry-instrumentation-openai-v2/src/opentelemetry/instrumentation/openai_v2/patch.py
index 2c8c1b4c71..996c91c04d 100644
--- a/instrumentation-genai/opentelemetry-instrumentation-openai-v2/src/opentelemetry/instrumentation/openai_v2/patch.py
+++ b/instrumentation-genai/opentelemetry-instrumentation-openai-v2/src/opentelemetry/instrumentation/openai_v2/patch.py
@@ -39,7 +39,7 @@
     LLMInvocation,
     OutputMessage,
     Text,
-    ToolCall,
+    ToolCallRequest,
 )
 
 from .instruments import Instruments
@@ -914,7 +914,7 @@ def _set_output_messages(self):
                             arguments = json.loads(arguments_str)
                         except json.JSONDecodeError:
                             arguments = arguments_str
-                    tool_call_part = ToolCall(
+                    tool_call_part = ToolCallRequest(
                         name=tool_call.function_name,
                         id=tool_call.tool_call_id,
                         arguments=arguments,
diff --git a/instrumentation-genai/opentelemetry-instrumentation-openai-v2/src/opentelemetry/instrumentation/openai_v2/utils.py b/instrumentation-genai/opentelemetry-instrumentation-openai-v2/src/opentelemetry/instrumentation/openai_v2/utils.py
index 7e5d2307ca..6afca130b6 100644
--- a/instrumentation-genai/opentelemetry-instrumentation-openai-v2/src/opentelemetry/instrumentation/openai_v2/utils.py
+++ b/instrumentation-genai/opentelemetry-instrumentation-openai-v2/src/opentelemetry/instrumentation/openai_v2/utils.py
@@ -41,7 +41,7 @@
     LLMInvocation,
     OutputMessage,
     Text,
-    ToolCall,
+    ToolCallRequest,
     ToolCallResponse,
 )
 
@@ -452,7 +452,7 @@ def _prepare_input_messages(messages) -> List[InputMessage]:
     return chat_messages
 
 
-def extract_tool_calls_new(tool_calls) -> list[ToolCall]:
+def extract_tool_calls_new(tool_calls) -> list[ToolCallRequest]:
     parts = []
     for tool_call in tool_calls:
         call_id = get_property_value(tool_call, "id")
@@ -470,7 +470,9 @@ def extract_tool_calls_new(tool_calls) -> list[ToolCall]:
                     arguments = arguments_str
 
         # TODO: support custom
-        parts.append(ToolCall(id=call_id, name=func_name, arguments=arguments))
+        parts.append(
+            ToolCallRequest(id=call_id, name=func_name, arguments=arguments)
+        )
     return parts
 
 
diff --git a/instrumentation-genai/opentelemetry-instrumentation-vertexai/pyproject.toml b/instrumentation-genai/opentelemetry-instrumentation-vertexai/pyproject.toml
index 3d715a2a87..e6090642f6 100644
--- a/instrumentation-genai/opentelemetry-instrumentation-vertexai/pyproject.toml
+++ b/instrumentation-genai/opentelemetry-instrumentation-vertexai/pyproject.toml
@@ -26,10 +26,10 @@ classifiers = [
   "Programming Language :: Python :: 3.14",
 ]
 dependencies = [
-  "opentelemetry-api ~= 1.37",
-  "opentelemetry-instrumentation ~= 0.58b0",
-  "opentelemetry-semantic-conventions ~= 0.58b0",
-  "opentelemetry-util-genai >= 0.2b0, <0.4b0",
+  "opentelemetry-api ~= 1.39",
+  "opentelemetry-instrumentation ~= 0.60b0",
+  "opentelemetry-semantic-conventions ~= 0.60b0",
+  "opentelemetry-util-genai >= 0.4b0.dev, <0.5b0",
 ]
 
 [project.optional-dependencies]
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..9686d0dd7a 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
@@ -52,12 +52,14 @@
 )
 from opentelemetry.semconv.attributes import server_attributes
 from opentelemetry.util.genai.types import (
+    Blob,
     ContentCapturingMode,
     FinishReason,
     MessagePart,
     Text,
-    ToolCall,
+    ToolCallRequest,
     ToolCallResponse,
+    Uri,
 )
 from opentelemetry.util.genai.utils import get_content_capturing_mode
 from opentelemetry.util.types import AnyValue, AttributeValue
@@ -308,21 +310,15 @@ def request_to_events(
         yield user_event(role=content.role, content=request_content)
 
 
-@dataclass
-class BlobPart:
-    data: bytes
-    mime_type: str
-    type: Literal["blob"] = "blob"
-
-
-@dataclass
-class FileDataPart:
-    mime_type: str
-    uri: str
-    type: Literal["file_data"] = "file_data"
-
-    class Config:
-        extra = "allow"
+def _modality_from_mime_type(mime_type: str) -> str:
+    """Infer modality from MIME type prefix."""
+    if mime_type.startswith("image/"):
+        return "image"
+    if mime_type.startswith("video/"):
+        return "video"
+    if mime_type.startswith("audio/"):
+        return "audio"
+    return mime_type
 
 
 def convert_content_to_message_parts(
@@ -341,7 +337,7 @@ 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(
@@ -353,14 +349,22 @@ def convert_content_to_message_parts(
             parts.append(Text(content=part.text))
         elif "inline_data" in part:
             part = part.inline_data
+            mime_type = part.mime_type or ""
             parts.append(
-                BlobPart(mime_type=part.mime_type or "", data=part.data or b"")
+                Blob(
+                    mime_type=mime_type,
+                    modality=_modality_from_mime_type(mime_type),
+                    content=part.data or b"",
+                )
             )
         elif "file_data" in part:
             part = part.file_data
+            mime_type = part.mime_type or ""
             parts.append(
-                FileDataPart(
-                    mime_type=part.mime_type or "", uri=part.file_uri or ""
+                Uri(
+                    mime_type=mime_type,
+                    modality=_modality_from_mime_type(mime_type),
+                    uri=part.file_uri or "",
                 )
             )
         else:
diff --git a/instrumentation-genai/opentelemetry-instrumentation-vertexai/tests/requirements.oldest.txt b/instrumentation-genai/opentelemetry-instrumentation-vertexai/tests/requirements.oldest.txt
index 5b5c7e8f67..d02e3dc8e4 100644
--- a/instrumentation-genai/opentelemetry-instrumentation-vertexai/tests/requirements.oldest.txt
+++ b/instrumentation-genai/opentelemetry-instrumentation-vertexai/tests/requirements.oldest.txt
@@ -65,11 +65,12 @@ grpcio>=1.75.1 ; python_version >= "3.14"
 shapely==2.0.6 ; python_version < "3.10"
 shapely==2.1.2 ; python_version >= "3.10"
 # when updating, also update in pyproject.toml
-opentelemetry-api==1.37
-opentelemetry-sdk==1.37
-opentelemetry-semantic-conventions==0.58b0
-opentelemetry-instrumentation==0.58b0
-opentelemetry-util-genai[upload]==0.2b0
+opentelemetry-api==1.39
+opentelemetry-sdk==1.39
+opentelemetry-semantic-conventions==0.60b0
+opentelemetry-instrumentation==0.60b0
+# 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/instrumentation-genai/opentelemetry-instrumentation-vertexai/tests/test_chat_completions_experimental.py b/instrumentation-genai/opentelemetry-instrumentation-vertexai/tests/test_chat_completions_experimental.py
index 5613f551a6..617d9a81c9 100644
--- a/instrumentation-genai/opentelemetry-instrumentation-vertexai/tests/test_chat_completions_experimental.py
+++ b/instrumentation-genai/opentelemetry-instrumentation-vertexai/tests/test_chat_completions_experimental.py
@@ -74,7 +74,7 @@ def test_generate_content_with_files(
         "gen_ai.usage.output_tokens": 5,
         "server.address": "us-central1-aiplatform.googleapis.com",
         "server.port": 443,
-        "gen_ai.input.messages": '[{"role":"user","parts":[{"content":"Say this is a test","type":"text"},{"mime_type":"image/jpeg","uri":"https://images.pdimagearchive.org/collections/microscopic-delights/1lede-0021.jpg","type":"file_data"},{"data":"iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==","mime_type":"image/jpeg","type":"blob"}]}]',
+        "gen_ai.input.messages": '[{"role":"user","parts":[{"content":"Say this is a test","type":"text"},{"mime_type":"image/jpeg","modality":"image","uri":"https://images.pdimagearchive.org/collections/microscopic-delights/1lede-0021.jpg","type":"uri"},{"mime_type":"image/jpeg","modality":"image","content":"iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==","type":"blob"}]}]',
         "gen_ai.output.messages": '[{"role":"model","parts":[{"content":"This is a test.","type":"text"}],"finish_reason":"stop"}]',
     }
 
@@ -97,12 +97,14 @@ def test_generate_content_with_files(
                     {"content": "Say this is a test", "type": "text"},
                     {
                         "mime_type": "image/jpeg",
+                        "modality": "image",
                         "uri": "https://images.pdimagearchive.org/collections/microscopic-delights/1lede-0021.jpg",
-                        "type": "file_data",
+                        "type": "uri",
                     },
                     {
-                        "data": b"\x89PNG\r\n\x1a\n\x00\x00\x00\rIHDR\x00\x00\x00\x05\x00\x00\x00\x05\x08\x06\x00\x00\x00\x8do&\xe5\x00\x00\x00\x1cIDAT\x08\xd7c\xf8\xff\xff?\xc3\x7f\x06 \x05\xc3 \x12\x84\xd01\xf1\x82X\xcd\x04\x00\x0e\xf55\xcb\xd1\x8e\x0e\x1f\x00\x00\x00\x00IEND\xaeB`\x82",
                         "mime_type": "image/jpeg",
+                        "modality": "image",
+                        "content": b"\x89PNG\r\n\x1a\n\x00\x00\x00\rIHDR\x00\x00\x00\x05\x00\x00\x00\x05\x08\x06\x00\x00\x00\x8do&\xe5\x00\x00\x00\x1cIDAT\x08\xd7c\xf8\xff\xff?\xc3\x7f\x06 \x05\xc3 \x12\x84\xd01\xf1\x82X\xcd\x04\x00\x0e\xf55\xcb\xd1\x8e\x0e\x1f\x00\x00\x00\x00IEND\xaeB`\x82",
                         "type": "blob",
                     },
                 ),
diff --git a/util/opentelemetry-util-genai/CHANGELOG.md b/util/opentelemetry-util-genai/CHANGELOG.md
index d779ac8efe..565a18d587 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, breaking change: usage of ToolCall class renamed to ToolCallRequest 
+  ([#4218](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4218))
 - Add EmbeddingInvocation span lifecycle support
   ([https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4219](#4219))
 - Populate schema_url on metrics
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 a714e808b6..538d61490b 100644
--- a/util/opentelemetry-util-genai/src/opentelemetry/util/genai/types.py
+++ b/util/opentelemetry-util-genai/src/opentelemetry/util/genai/types.py
@@ -30,6 +30,17 @@
 ContextToken: TypeAlias = Token[Context]
 
 
+@dataclass()
+class GenericPart:
+    """Used for provider-specific message part types that don't match
+    the standard MessagePart types defined in semantic conventions. Wrap custom
+    types with GenericPart(value=...) to explicitly opt-in to non-standard types.
+    This will be removed in a future version when all instrumentations use core types."""
+
+    value: Any
+    type: Literal["generic"] = "generic"
+
+
 class ContentCapturingMode(Enum):
     # Do not capture content (default).
     NO_CONTENT = 0
@@ -42,8 +53,11 @@ class ContentCapturingMode(Enum):
 
 
 @dataclass()
-class ToolCall:
-    """Represents a tool call requested by the model
+class ToolCallRequest:
+    """Represents a tool call requested by the model (message part only).
+
+    Use this for tool calls in message history. For execution tracking with spans
+    and metrics, use ToolCall instead.
 
     This model is specified as part of semconv in `GenAI messages Python models - ToolCallRequestPart
     <https://github.com/open-telemetry/semantic-conventions/blob/main/docs/gen-ai/non-normative/models.ipynb>`__.
@@ -68,6 +82,41 @@ class ToolCallResponse:
     type: Literal["tool_call_response"] = "tool_call_response"
 
 
+@dataclass()
+class ServerToolCall:
+    """Represents a server-side tool call invocation.
+
+    Server tool calls are executed by the model provider on the server side rather
+    than by the client application. Provider-specific tools (e.g., code_interpreter,
+    web_search) can have well-defined schemas defined by the respective providers.
+
+    This model is specified as part of semconv in `GenAI messages Python models - ServerToolCallPart
+    <https://github.com/open-telemetry/semantic-conventions/blob/main/docs/gen-ai/non-normative/models.ipynb>`__.
+    """
+
+    name: str
+    server_tool_call: Any
+    id: str | None = None
+    type: Literal["server_tool_call"] = "server_tool_call"
+
+
+@dataclass()
+class ServerToolCallResponse:
+    """Represents a server-side tool call response.
+
+    Contains the outcome and details of a server tool execution. Provider-specific
+    tools (e.g., code_interpreter, web_search) can have well-defined response schemas
+    defined by the respective providers.
+
+    This model is specified as part of semconv in `GenAI messages Python models - ServerToolCallResponsePart
+    <https://github.com/open-telemetry/semantic-conventions/blob/main/docs/gen-ai/non-normative/models.ipynb>`__.
+    """
+
+    server_tool_call_response: Any
+    id: str | None = None
+    type: Literal["server_tool_call_response"] = "server_tool_call_response"
+
+
 @dataclass()
 class Text:
     """Represents text content sent to or received from the model
@@ -158,7 +207,16 @@ class GenericToolDefinition:
 ToolDefinition = Union[FunctionToolDefinition, GenericToolDefinition]
 
 MessagePart = Union[
-    Text, ToolCall, ToolCallResponse, Blob, File, Uri, Reasoning, Any
+    Text,
+    ToolCallRequest,
+    ToolCallResponse,
+    ServerToolCall,
+    ServerToolCallResponse,
+    Blob,
+    File,
+    Uri,
+    Reasoning,
+    GenericPart,  # For provider-specific types; prefer standard types above
 ]
 
 
@@ -201,6 +259,7 @@ class GenAIInvocation:
     context_token: ContextToken | None = None
     span: Span | None = None
     attributes: dict[str, Any] = field(default_factory=_new_str_any_dict)
+    error_type: str | None = None
 
     monotonic_start_s: float | None = None
     """
@@ -311,6 +370,51 @@ class EmbeddingInvocation(GenAIInvocation):
     """
 
 
+@dataclass()
+class ToolCall(GenAIInvocation):
+    """Represents a tool call for execution tracking with spans and metrics.
+
+    This type extends GenAIInvocation (like LLMInvocation) for consistent lifecycle
+    management across all invocation types. It is NOT used as a MessagePart directly -
+    use ToolCallRequest for that purpose.
+
+    Inherits from GenAIInvocation:
+    - context_token: Context tracking for span lifecycle
+    - span: Active span reference
+    - attributes: Custom attributes dict for extensibility
+
+    Reference: https://github.com/open-telemetry/semantic-conventions/blob/main/docs/gen-ai/gen-ai-spans.md#execute-tool-span
+
+    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)
+    """
+
+    # Message identification fields (same as ToolCallRequest)
+    # Note: These are required fields but must have defaults due to dataclass inheritance
+    name: str = ""
+    arguments: Any = None
+    id: str | None = None
+    type: Literal["tool_call"] = "tool_call"
+
+    # Execution tracking 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
+
+    # Timing field (not inherited from GenAIInvocation, matches LLMInvocation pattern)
+    monotonic_start_s: float | None = None
+
+
 @dataclass
 class Error:
     message: str
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..d076f5e72b
--- /dev/null
+++ b/util/opentelemetry-util-genai/tests/test_toolcall.py
@@ -0,0 +1,118 @@
+# 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 inheritance structure"""
+
+import pytest
+
+from opentelemetry.util.genai.types import (
+    GenAIInvocation,
+    InputMessage,
+    ServerToolCall,
+    ServerToolCallResponse,
+    ToolCall,
+    ToolCallRequest,
+)
+
+
+def test_toolcallrequest_is_message_part():
+    """ToolCallRequest is for message parts only"""
+    tcr = ToolCallRequest(
+        arguments={"location": "Paris"}, name="get_weather", id="call_123"
+    )
+    msg = InputMessage(role="user", parts=[tcr])
+    assert len(msg.parts) == 1
+
+
+def test_toolcall_inherits_from_genaiinvocation():
+    """ToolCall inherits from GenAIInvocation for lifecycle management"""
+    tc = ToolCall(name="get_weather", arguments={"city": "Paris"})
+    assert isinstance(tc, GenAIInvocation)
+    assert not isinstance(tc, ToolCallRequest)
+
+
+def test_toolcall_has_attributes_dict():
+    """ToolCall inherits attributes dict from GenAIInvocation"""
+    tc = ToolCall(name="test")
+    tc.attributes["custom.key"] = "value"
+    assert tc.attributes["custom.key"] == "value"
+
+
+def test_toolcall_in_message_part_union():
+    """ToolCall can be used in messages despite not inheriting from ToolCallRequest"""
+    tc = ToolCall(name="get_weather", arguments={"city": "Paris"})
+    msg = InputMessage(role="assistant", parts=[tc])
+    assert len(msg.parts) == 1
+    assert isinstance(msg.parts[0], GenAIInvocation)
+
+
+def test_server_tool_call_basic():
+    """ServerToolCall can be created with required fields"""
+    stc = ServerToolCall(
+        name="code_interpreter",
+        server_tool_call={"type": "code_interpreter", "code": "print(1)"},
+    )
+    assert stc.name == "code_interpreter"
+    assert stc.server_tool_call == {
+        "type": "code_interpreter",
+        "code": "print(1)",
+    }
+    assert stc.id is None
+    assert stc.type == "server_tool_call"
+
+
+def test_server_tool_call_with_id():
+    """ServerToolCall can have an optional id"""
+    stc = ServerToolCall(
+        name="web_search",
+        server_tool_call={"type": "web_search", "query": "weather"},
+        id="stc_001",
+    )
+    assert stc.id == "stc_001"
+
+
+def test_server_tool_call_response_basic():
+    """ServerToolCallResponse can be created with required fields"""
+    stcr = ServerToolCallResponse(
+        server_tool_call_response={
+            "type": "code_interpreter",
+            "output": "1\n",
+        },
+    )
+    assert stcr.server_tool_call_response == {
+        "type": "code_interpreter",
+        "output": "1\n",
+    }
+    assert stcr.id is None
+    assert stcr.type == "server_tool_call_response"
+
+
+def test_server_tool_call_in_message():
+    """ServerToolCall and ServerToolCallResponse work as MessageParts"""
+    stc = ServerToolCall(
+        name="code_interpreter",
+        server_tool_call={"type": "code_interpreter", "code": "x = 1"},
+    )
+    stcr = ServerToolCallResponse(
+        server_tool_call_response={"type": "code_interpreter", "output": ""},
+        id="stc_001",
+    )
+    msg = InputMessage(role="assistant", parts=[stc, stcr])
+    assert len(msg.parts) == 2
+    assert isinstance(msg.parts[0], ServerToolCall)
+    assert isinstance(msg.parts[1], ServerToolCallResponse)
+
+
+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"},