Add missing add_resource_template() to MCPServer

[okapies]

Motivation and Context

Add the missing add_resource_template() method to MCPServer and ResourceManager to manage resource template implementations manually and independently without using the @mcp.resource decorator.

Note that this PR leaves add_template() in place to maintain backward compatibility.

How Has This Been Tested?

n/a

Breaking Changes

Non-breaking changes.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context

[cubic-dev-ai]

No issues found across 2 files

_{Re-trigger cubic}

[cubic-dev-ai]

1 issue found across 1 file (changes from recent commits).

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="tests/server/mcpserver/test_server.py">

<violation number="1" location="tests/server/mcpserver/test_server.py:1017">
P2: Missing assertions: `test_add_resource_template` never verifies the template was actually registered. Call `await mcp.list_resource_templates()` and assert the expected count, or use `Client` to read a resource through the template, so the test catches regressions. Without assertions the test will pass even if `add_resource_template` is a no-op.</violation>
</file>

<sub>Tip: Review your code locally with the cubic CLI to iterate faster.

Re-trigger cubic</sub>

[cubic-dev-ai]

P2: Missing assertions: test_add_resource_template never verifies the template was actually registered. Call await mcp.list_resource_templates() and assert the expected count, or use Client to read a resource through the template, so the test catches regressions. Without assertions the test will pass even if add_resource_template is a no-op.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At tests/server/mcpserver/test_server.py, line 1017:

<comment>Missing assertions: `test_add_resource_template` never verifies the template was actually registered. Call `await mcp.list_resource_templates()` and assert the expected count, or use `Client` to read a resource through the template, so the test catches regressions. Without assertions the test will pass even if `add_resource_template` is a no-op.</comment>

<file context>
@@ -1004,6 +1004,18 @@ def get_csv(user: str) -> str:
+            return "Data"
+
+        template = ResourceTemplate.from_function(get_data, "resource://{param}")
+        mcp.add_resource_template(template)
+
 
</file context>

[okapies]

MCPServer.add_resource_template() returns None, just like add_resource().