Протокол MCP vs Function Calling

Model Context Protocol (MCP) vs traditional Function Calling compares two ways AI agents interact with databases, browsers, CRMs, and APIs. Function Calling requires custom glue code per integration, whereas MCP standardizes tool discovery and execution like USB-C for AI.

Протокол MCP vs Function Calling
Протокол MCP (Open Standard (Anthropic / Linux Foundation)) vs Function Calling (Vendor-Specific JSON Tool Calls) · Hamidun News

Comparatif par critères

DimensionПротокол MCPFunction Calling
Cross-Client ReusabilityWrite an MCP server once (e.g., Postgres, Playwright, CRM) and use it immediately across Claude Code, Nomad Agent, and Cursor.JSON schemas and execution handlers are tightly coupled to a single application codebase.
Context Window EfficiencyWith lazy schema loading, the agent loads only the needed tool definition on demand, saving tens of thousands of tokens.Passing 50–100 JSON tool schemas on every API turn bloats token cost and degrades selection accuracy.
Stateful Sessions & ResourcesMaintains stateful sessions (like an open browser tab or DB connection), resources, and bidirectional notifications.Stateless: the model only emits JSON arguments while your host app must manage state manually.
Prebuilt Connector EcosystemThousands of ready-to-use open-source MCP servers attachable via a single config entry.Every integration must be written, tested, and maintained inside your own backend.
Overhead on Simple TasksIdeal for multi-tool agents; complemented by lightweight CLI scripts for single-step tasks.Simple and direct when an app only needs 2–3 fixed actions.

Verdict de la rédaction

Verdict

If your app only calls 2–3 fixed functions, standard Function Calling is fine. For full-scale autonomous agents in Claude Code or Nomad Agent orchestrating dozens of services, MCP with lazy loading is the industry standard.

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Zhemal Khamidun — CPO d'Alpina Digital, product manager d'AlpinaGPT. Conçoit des produits IA depuis 2019. Hamidun News est un projet personnel devenu un agrégateur en production avec plus de 6 000 lecteurs.
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