From Snap to Story: Building an AI Photo Journal with React Native, PoML & MCP: Part 4

From Snap to Story: Building an AI Photo Journal with React Native, PoML & MCP: Part 4

Part 4: Add PoML Schema for Your Image Captioning

By Bharat Tiwari

Quick Context — What Makes a “Real MCP”

A real MCP (Model Context Protocol) app differs from a simple API because it:

  1. Standardizes how models are described, invoked, and reasoned with — using PoML or structured schemas.

  2. Allows composable “capabilities” (captioning, analysis, classification, etc.) that can be dynamically discovered or linked to other MCP nodes.

  3. Supports multi-model pipelines, chaining different AI tasks in context.

  4. Can expose self-describing interfaces, meaning another agent or tool can auto-discover what the MCP can do (using /capabilities, /describe, etc.).

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