Balancing Precision and Context in MCP Data Tools
Fit-Case1093 · reddit · 2026-07-17
The author shares their complete design philosophy for MCP data tools within acme-mcp:
- Initially, they considered a single unified entry point like querydata(dataset, filters), which keeps the tool catalog small.
- However, this prevents the model from seeing implicit contracts across different datasets (e.g., sales data usually requiring a date range, inventory data needing a warehouse dimension).
- Splitting these into multiple typed tools clarifies these constraints, making it easier for the model to pick the right tool.
- A new issue arises: as the tool catalog grows, loading all schemas at once bloats the context with irrelevant definitions.
- Their compromise: keep related filters within the same typed tool, utilize progressive discovery/loading when necessary, and only narrow the exposed scope if a schema genuinely consumes too much context.
The author includes a link to a full article further detailing these design trade-offs.
Related event: Balancing Precision and Context in MCP Data Tool Design(3 posts)→
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