A developer has optimized a hook script for Claude Code, named `cost_guard.sh`, which previously caused significant latency due to its synchronous execution and the high startup cost of the `ccusage` Node.js CLI. The hook, designed to monitor token count and burn rate, was taking up to five seconds to complete on average. The solution implemented a 60-second Time-To-Live (TTL) cache, storing the results in a temporary file. This cache ensures that the `ccusage` command is only executed once per minute, drastically reducing turn latency for most prompts. The developer emphasizes the importance of caching the "normal" case (no warning) as well as exceptions to ensure the most frequent path is the fastest. AI
IMPACT Reduces latency for users interacting with AI models via custom scripts, improving the user experience.
RANK_REASON Developer blog post detailing a technical optimization for a specific tool/script.
Read on dev.to — Claude Code tag →
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