Phase 4: Implement Advanced Features (Multi-tenancy & UI)

Goal

Enterprise features and management UI

Tasks

Backend Implementation ✅ COMPLETE

• Add user_id to all MCP resources
• Implement public/private namespace scoping
• Audit trail for tool invocations
• Add health endpoint (GET /metamcp/health)
• Add audit listing endpoint (GET /metamcp/audits)
• AuditMiddleware for automatic tool call logging
• REST wrapper for MCP tools
• OpenAPI spec generation at /metamcp/openapi.json

In Progress / Planned

• Role-based access control for endpoints (future enhancement)
• Auto-generate OpenAPI specs from MCP tools (manual for now)
• Swagger UI integration (OpenAPI JSON available for external viewers)

Frontend (Deferred to Phase 5)

• Extend Svelte frontend with MCP management views
• Namespace CRUD operations UI
• Tool enable/disable toggles
• Endpoint management dashboard
• Real-time server status display

Completed Features

Phase 4A - Multi-Tenancy & Compliance

Commit: 6ce6d3ad

Persistence Layer

• McpAuditRecord for tool invocation tracking
• NamespaceVisibility enum (Public/Private) with Private default
• Audit trail methods: save_audit, get_audit, list_audits, delete_audit
• list_namespaces_with_visibility for multi-tenancy support
• OpenDAL-based audit storage

Middleware

• AuditMiddleware for automatic tool call logging
• Feature-gated with 'audit' feature flag
• Tracks: tool name, arguments, response, errors, latency

API Layer

• get_mcp_health endpoint with namespace/endpoint counts
• list_audits endpoint (limit 100 recent records)
• Visibility field in CreateNamespaceRequest

Routes

• GET /metamcp/health - Server health with counts
• GET /metamcp/audits - Recent audit trail

Phase 4B - REST API Wrapper

Commit: 3d5a1c32

API Module (terraphim_server/src/api_mcp_tools.rs)

• list_tools_for_endpoint: Lists all tools for an endpoint
• execute_tool: Executes tool with JSON arguments
• create_proxy_from_namespace: Initializes McpProxy from config
• Error handling for missing endpoints/namespaces

Routes

• GET /metamcp/endpoints/{endpoint_uuid}/tools
• POST /metamcp/endpoints/{endpoint_uuid}/tools/{tool_name}

Integration

• Leverages terraphim_mcp_proxy for routing
• Uses MCP persistence for lookups
• Supports all transports (STDIO, SSE, HTTP, OAuth)

Phase 4C - OpenAPI Documentation

Commit: 318f113a

API Specification

• Complete OpenAPI 3.0 spec at GET /metamcp/openapi.json
• Documented paths, parameters, request/response schemas
• Ready for Postman/Insomnia/Swagger UI import

Type System

• McpTool: OpenAPI-compatible tool wrapper
• McpContentItem: Response content enum
• ToolListResponse, ToolCallRequestPayload, ToolCallResponsePayload
• All types implement ToSchema for documentation

Test Coverage

• Persistence: 6/6 tests passing (audit, visibility)
• MCP Proxy: 19/19 tests passing
• MCP Tools API: 7/7 tests passing
• Total: 32 tests passing ✅

Success Criteria

• Multi-user support with proper isolation (namespace visibility)
• Audit trail for compliance
• REST API for tool execution
• OpenAPI documentation
• High test coverage (32 tests)
• Web UI for managing MCP configuration (deferred to Phase 5)

Usage Examples

# List tools
curl http://localhost:8080/metamcp/endpoints/{uuid}/tools

# Execute tool
curl -X POST http://localhost:8080/metamcp/endpoints/{uuid}/tools/filesystem__read_file \
  -H "Content-Type: application/json" \
  -d '{"arguments": {"path": "/path/to/file"}}'

# Get OpenAPI spec
curl http://localhost:8080/metamcp/openapi.json > mcp-api.json

# Health check
curl http://localhost:8080/metamcp/health

# Audit trail
curl http://localhost:8080/metamcp/audits

Timeline

Week 7-8 (Backend completed ahead of schedule ✅)

Phase 4 COMPLETE - All backend features implemented with full test coverage.

Depends on: Phase 3 ✅

This is a completed phase tracker rather than a single scoped task. Start with terraphim_server/src/api_mcp_tools.rs and the listed MCP routes, then inspect the current backend and frontend entry points. The remaining work is broad: role-based access control, automatic OpenAPI generation, Swagger UI, and deferred Svelte management views.