MCP-CustomTool: Integration Tests

[souvikghosh04]

Goal: Validate end-to-end tool registration and MCP exposure

Files to Create:

src/Azure.DataApiBuilder.Mcp.Tests/CustomToolRegistrationTests.cs

Verify tools appear in tools/list response
Validate tool metadata exposed to MCP clients
Test DI container registration (multiple tools, singletons)
Verify exclusion from DynamicCustomTool auto-registration
src/Azure.DataApiBuilder.Mcp.Tests/CustomToolDiscoveryTests.cs

MCP protocol compliance (correct JSON schema format)
Tool name uniqueness and collision handling
Parameter schema structure validation
Description field propagation in MCP responses
Test Coverage:

• Custom tools registered as IMcpTool singletons
• Tools discoverable via MCP tools/list endpoint
• Correct tool count based on configuration
• Metadata structure matches MCP specification

Deliverable: Validated tool discovery and registration pipeline