Saas And MCP Architecture

SaaS Connector & Autonomous MCP Architecture Skill

This skill guides AI agents in implementing and extending enterprise SaaS capabilities, encrypted credential vaults, multi-cloud storage backends, and Model Context Protocol (MCP) server integrations across applications.

1. UI Connector Hub & Encrypted Credential Vault

When implementing or modifying connectors:

• Zero Plaintext Secrets in Client-Side Storage: User-provided API keys and third-party tokens MUST be stored in the database with AES-256-GCM envelope encryption.
• Provider Connection Pooling: Support multiple API keys with round-robin rotation, latency tracking, and automatic failover.
• Database Connectors: Provide connection validation and branch selection for serverless and self-hosted PostgreSQL instances.
• Health Probes: Connectors must implement a periodic health check loop (last_health_check, health_status).

2. Pluggable Multi-Cloud Storage Engine

When extending file archiving and storage destinations:

• All storage drivers must implement a standard StorageProvider interface:

  type StorageProvider interface {
      Upload(ctx context.Context, key string, r io.Reader, size int64) error
      Download(ctx context.Context, key string, w io.Writer) error
      VerifyChecksum(ctx context.Context, key string, expectedSHA256 string) (bool, error)
      Delete(ctx context.Context, key string) error
      List(ctx context.Context, prefix string) ([]ObjectMetadata, error)
  }
  

• Support pluggable backends: AWS S3, Cloudflare R2, MinIO, Google Drive, Azure Blob, and Local Filesystem.
• Streaming uploads should stream directly from memory or pipes without requiring massive local scratch disk space.

3. Model Context Protocol (MCP) Server Integration

When adding MCP tools to AI agents:

1. Protocol Adherence: Connect via standard MCP JSON-RPC protocol over Stdio or Server-Sent Events (SSE).
2. Human-In-The-Loop (HITL) Enforcement:
   • Read-only tools (query_state, list_records, inspect_telemetry) execute automatically.
   • Destructive or external actions (restart_service, restore_snapshot, trigger_incident_alert, apply_schema_migration) MUST trigger the HITL confirmation protocol.
3. Structured Response Synthesis:
   • All MCP tool outputs must be synthesized concisely in structured Markdown without emojis or conversational filler.

4. Exposing Native MCP Servers

When exposing a service's functionality as an MCP server to external IDEs or agents:

• Implement core tools:
  • get_system_health: Real-time status of services, DB, and queues.
  • trigger_job: Autonomous execution of specified jobs or workflows.
  • search_knowledge_base: Hybrid pgvector search across system logs.
  • verify_data_integrity: Checksum and schema validation.
• Support both standard stdio transport for local CLI/IDE agents and HTTP/SSE transport for web-based agents.