Tools (MCP Tools)

Tools are the "verbs" of the MCP ecosystem. They represent discrete, callable functions that an AI agent can execute to perform a task or retrieve dynamic data.

Tool Definition

Every tool in an MCP server includes:

• → Name: A unique identifier (e.g., calculate_roi).
• → Description: A human-readable explanation that tells the LLM *when* and *how* to use the tool.
• → Schema: A JSON Schema defining the input parameters (arguments) the tool requires.

Examples

• → CRM: create_lead, update_deal_stage.
• → Engineering: run_unit_test, fetch_github_issue.
• → General: web_search, read_file.

Dynamic Tooling Lifecycle with HasMCP

HasMCP enhances the tool lifecycle by supporting Real-time Dynamic Tooling. Unlike static server implementations, HasMCP can monitor the status of underlying APIs and user permissions, automatically sending a notifications/tools/list_changed notification to the client when tool availability changes. This ensures that agents always have an up-to-date catalog of capabilities, preventing errors from calling decommissioned or unauthorized tools.