Open Source Tool 'budget-guard' Lets Developers Set Hard Daily Cost Caps on LLM APIs

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A developer has released budget-guard, an open source circuit breaker designed to enforce hard daily spending limits on LLM API calls in LangChain.js applications. The tool integrates as a single callback handler and checks cumulative project spend before each model call, throwing a BudgetExceededError to halt runaway loops before they inflate costs. Unlike token-based limits, the cap is denominated in US dollars to account for varying per-token rates across cached, uncached, and reasoning tokens. The library supports per-feature cost tagging to help identify which parts of an application are driving spend, a detail the author credits with uncovering a forgotten background job consuming 60% of total usage. Storage options include an in-process default, a Redis store for distributed worker fleets with atomic concurrency protection, and a file store suited to short-lived cron jobs.

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Open-Source RTL8852AU WiFi 6 Driver Brings Modern Wireless Support to Linux

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

Blazor Date Input Bug: Why Visible UI State Can Silently Diverge from Model Data

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