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MCP and Tool-Use Patterns: Wiring LLMs to Your Stack
Nanostack
Model Context Protocol (MCP) is standardizing how LLMs connect to APIs and data. Here are production-ready patterns for secure, observable tool use.
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.