Building MCP Tools: Where Should Query Logic Reside?
ojus_render · reddit · 2026-07-30
When building metric tools based on the Model Context Protocol (MCP), developers are debating the optimal placement for query logic. The author argues that providing agents with a typed query surface yields better results than offering an open-ended query language.
Using Render's getmetrics tool as an example, parameters like time window, resolution, host filters, and CPU aggregation are defined directly in the tool's input schema. This allows the model to decide what to inspect while keeping the available operations explicit and predictable on the server side.
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