feat: Add items and title to ToolParameter/ToolParamDefinition (#3003)

# What does this PR do?
<!-- Provide a short summary of what this PR does and why. Link to
relevant issues if applicable. -->
Add items and title to ToolParameter/ToolParamDefinition. Adding items
will resolve the issue that occurs with Gemini LLM when an MCP tool has
array-type properties.

<!-- If resolving an issue, uncomment and update the line below -->
<!-- Closes #[issue-number] -->

## Test Plan
<!-- Describe the tests you ran to verify your changes with result
summaries. *Provide clear instructions so the plan can be easily
re-executed.* -->
Unite test cases will be added.

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Kai Wu <kaiwu@meta.com>
Co-authored-by: Ashwin Bharambe <ashwin.bharambe@gmail.com>

llama_stack/providers/inline/agents/meta_reference/agent_instance.py

@@ -798,6 +798,8 @@ 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
@@ -841,6 +843,8 @@ 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

llama_stack/providers/utils/inference/openai_compat.py

@@ -805,6 +805,10 @@ 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)
 

llama_stack/providers/utils/tools/mcp.py

@@ -120,6 +120,10 @@ 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(