v1.5.2: JSON Schema Compliance Fix

🔧 JSON Schema Compliance Fix

Critical Fix

• Fixed JSON Schema validation errors in MCP tool definitions
• Ensure inputSchema.required is always an array instead of null
• 100% MCP specification compliant JSON Schema generation

Technical Changes

• Remove omitempty tag from ToolInputSchema.Required across all MCP versions
• Add comprehensive tests to prevent regression
• Fix affects all transport types (stdio, websocket, HTTP, gRPC, etc.)

Files Changed

• util/schema/schema.go - Core schema generation
• mcp/*/tool.go - All MCP version definitions
• util/schema/schema_test.go - New compliance tests

Validation

• ✅ All tests pass
• ✅ MCP inspector compatibility confirmed
• ✅ No breaking API changes