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Model Context Protocol (MCP) and the Tool-Use Standard for 2025
MCP emerged as a common way to connect LLMs to data and tools. Why integrators cared and how it compared to ad-hoc function calling.
Deepskilling · May 21, 2025 · 1 min read
Model Context Protocol (MCP) and the Tool-Use Standard for 2025
By spring 2025, Model Context Protocol (MCP) was discussed alongside function calling as a way to plug LLMs into databases, repos, and SaaS — with a shared wire format integrators could reuse.
The problem MCP addressed
Before MCP, every IDE plugin and agent framework invented its own tool schema. Teams rebuilt Slack, Postgres, and GitHub connectors N times. MCP proposed servers that expose resources and tools through a standard client protocol.
Core concepts
- MCP server — Wraps a system (GitHub, Linear, internal API)
- MCP client — Host application (IDE, agent runtime)
- Resources — Readable context (files, records)
- Tools — Callable actions with typed inputs
Takeaways
- MCP in 2025 was about integration economies of scale for agentic systems.
- Treat MCP servers like microservices — version, test, and monitor them.
- Standard protocols do not replace governance; they make it easier to enforce consistently.
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