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Fixing prompt cache bugs cut Claude API costs by 58%

Pulse Weekly · Issue 050 — Preterview founder Ji AI reported a 0% cache hit rate across 1,412 consecutive Claude API calls due to three subt

• TacticsPreterview cuts Claude token costs 58% after fixing prompt caching bugs
• ToolsRailway discloses security breach after attacker accesses customer environment variables
• ToolsOpenAI and Anthropic cut LLM API prices by up to 80%
• ToolsLiteLLM PyPI package version 1.107.0 compromised with credential stealer and backdoor
• ToolsRailway discloses security incident compromising connected GitHub accounts
• TacticsRemoving single trailing space cuts LLM classification errors from 41 to 3
• TacticsSolo developer captures 100 daily organic downloads via ChatGPT comparison listings
• TacticsDeveloper analysis of 715 comments details why uniform AI memory decay fails
• TacticsApple developer docs contradict April 2027 screenshot rules for iPhone Duo apps
• ToolsIndexable launches Blaze to speed incremental Rust builds by up to 92x
• ToolsWebframe runs headless web apps via native OS browsers without bundling Playwright
• TacticsDeveloper uses iTunes Search API script to audit App Store competitors before building
• ToolsMouse trajectory identified 100% of browser AI agents in 23-agent benchmark
• DiscourseJakob Greenfeld finds 50% of r/sales cold email posts come from sellers
• ToolsDefault Nginx proxy buffering spikes Claude SSE streaming TTFT from 0.7s to 3.4s
• ToolsHugging Face study shows prefix caching cuts coding LLM latency to 2.8s
• ToolsClaude Code docs recommend capping CLAUDE.md at 200 lines to avoid instruction loss
• TacticsDeveloper audit reveals 86% of tracked GitHub bounties are fake
• DiscourseReddit community r/opensource bans solo projects and LLM-assisted software
• TacticsPre-feedback claim checklists eliminate sycophantic revisions in LLM agents across five Gemini models