diff --git a/llama_stack/apis/tools/tools.py b/llama_stack/apis/tools/tools.py
index 52b86375a..f68a29b9f 100644
--- a/llama_stack/apis/tools/tools.py
+++ b/llama_stack/apis/tools/tools.py
@@ -26,6 +26,8 @@ class ToolParameter(BaseModel):
     :param parameter_type: Type of the parameter (e.g., string, integer)
     :param description: Human-readable description of what the parameter does
     :param required: Whether this parameter is required for tool invocation
+    :param items: Type of the elements when parameter_type is array
+    :param title: (Optional) Title of the parameter
     :param default: (Optional) Default value for the parameter if not provided
     """
 
@@ -33,6 +35,8 @@ class ToolParameter(BaseModel):
     parameter_type: str
     description: str
     required: bool = Field(default=True)
+    items: dict | None = None
+    title: str | None = None
     default: Any | None = None
 
 
diff --git a/llama_stack/models/llama/datatypes.py b/llama_stack/models/llama/datatypes.py
index 7f1ebed55..0baa6e55b 100644
--- a/llama_stack/models/llama/datatypes.py
+++ b/llama_stack/models/llama/datatypes.py
@@ -92,6 +92,8 @@ class ToolParamDefinition(BaseModel):
     param_type: str
     description: str | None = None
     required: bool | None = True
+    items: Any | None = None
+    title: str | None = None
     default: Any | None = None
 
 
diff --git a/llama_stack/providers/inline/agents/meta_reference/agent_instance.py b/llama_stack/providers/inline/agents/meta_reference/agent_instance.py
index fb22e10cc..e65963fb2 100644
--- a/llama_stack/providers/inline/agents/meta_reference/agent_instance.py
+++ b/llama_stack/providers/inline/agents/meta_reference/agent_instance.py
@@ -797,6 +797,8 @@ class ChatAgent(ShieldRunnerMixin):
                         param_type=param.parameter_type,
                         description=param.description,
                         required=param.required,
+                        items=param.items,
+                        title=param.title,
                         default=param.default,
                     )
                     for param in tool_def.parameters
@@ -840,6 +842,8 @@ class ChatAgent(ShieldRunnerMixin):
                                 param_type=param.parameter_type,
                                 description=param.description,
                                 required=param.required,
+                                items=param.items,
+                                title=param.title,
                                 default=param.default,
                             )
                             for param in tool_def.parameters
diff --git a/llama_stack/providers/utils/inference/openai_compat.py b/llama_stack/providers/utils/inference/openai_compat.py
index 47144ee0e..24ef7fdd2 100644
--- a/llama_stack/providers/utils/inference/openai_compat.py
+++ b/llama_stack/providers/utils/inference/openai_compat.py
@@ -796,6 +796,10 @@ def convert_tooldef_to_openai_tool(tool: ToolDefinition) -> dict:
                 properties[param_name].update(description=param.description)
             if param.default:
                 properties[param_name].update(default=param.default)
+            if param.items:
+                properties[param_name].update(items=param.items)
+            if param.title:
+                properties[param_name].update(title=param.title)
             if param.required:
                 required.append(param_name)
 
diff --git a/llama_stack/providers/utils/tools/mcp.py b/llama_stack/providers/utils/tools/mcp.py
index 02f7aaf8a..26b8c0981 100644
--- a/llama_stack/providers/utils/tools/mcp.py
+++ b/llama_stack/providers/utils/tools/mcp.py
@@ -88,6 +88,10 @@ async def list_mcp_tools(endpoint: str, headers: dict[str, str]) -> ListToolDefs
                         name=param_name,
                         parameter_type=param_schema.get("type", "string"),
                         description=param_schema.get("description", ""),
+                        required="default" not in param_schema,
+                        items=param_schema.get("items", None),
+                        title=param_schema.get("title", None),
+                        default=param_schema.get("default", None),
                     )
                 )
             tools.append(