MCP and Tool-Use Patterns: Wiring LLMs to Your Stack

MCP turns ad-hoc integrations into a contract

Before MCP, every team invented its own tool-calling layer. Model Context Protocol gives agents a consistent way to discover resources, invoke actions, and stream results — with room for auth and policy middleware.

Patterns that survive production traffic

• Read vs write separation: Search and fetch tools are open; mutation tools require scoped OAuth and idempotency keys.
• Schema-first tools: JSON Schema validated inputs/outputs — reject malformed agent plans before they hit your CRM.
• Trace everything: Correlate tool calls with conversation IDs for debugging and compliance.

Security checklist

Least-privilege tokens, per-tool rate limits, PII redaction in logs, and periodic permission reviews. Nanostack implements MCP servers and agent orchestration for SaaS and enterprise stacks — see our AI project work.