Schema Defaults Can Quietly Alter Freight Quotes in a Hosted MCP Server

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A developer walked through a shell smoke test of JTLGO's public commerce MCP server, which exposes freight-rating tools to AI agents. The article highlights a risk in typed tools: optional parameters with default values can change results without the caller noticing. In the test, a quote request sent with only weight and destination still succeeded, but the server silently filled in default box dimensions and goods type. Because freight pricing depends on volumetric weight, those hidden defaults can materially change the chargeable weight and quoted rate. The author argues that quote tools accepting weight without dimensions are effectively guessing.

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