Claude Code MCP Deep Dive (1): From Built-In Tools to Extensible Capabilities
TL;DR: Claude Code ships with a fixed set of built-in tools such as Read, Write, and Bash. MCP—the Model Context Protocol—lets it connect to an external process at runtime and use that process’s declared capabilities as new tools. MCP does not solve “how should I reuse a procedure?” That is the job of a Skill. MCP solves “how can the model perform an action it did not ship with?” Imagine that,…
Claude Code, a coding assistant, comes equipped with a set of built-in tools like Read, Write, and Bash. However, when faced with tasks that require interaction with external systems, such as accessing an internal Jira instance, the assistant has to rely on users to manually construct the necessary commands and parse the responses.
This process is time-consuming and prone to errors. To address this issue, the Model Context Protocol (MCP) was introduced. MCP allows Claude Code to connect to an external process at runtime and utilize its declared capabilities as new tools. By using an MCP server—a separate process or service that declares the tools it offers—the assistant can gain direct access to external systems without the need for manual scripting. This approach streamlines the process, improves reliability, and reduces the burden on users.
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