Why LLMs struggle with legal filing deadlines and a deterministic MCP fix
Large language models are weak at date arithmetic, so asking an agent to compute a US federal court filing deadline risks a hallucinated result. Real deadlines must account for weekends and federal holidays, and a miscalculation can amount to professional negligence. The author proposes moving the calculation into a deterministic tool, a US Filing Deadline Calculator exposed through an MCP connector. The connector offers three tools: one that computes deadlines for specific rule types, one that lists supported rules, and one that checks whether a date is a valid business day. The article also argues that production use of such MCP servers requires solving authentication, credential security, and side-effect control, which the Vinkius platform is designed to address.
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