Anthropic 更新提示词指南：一句"This codebase is yours"让 Fable 5.2 改代码更大胆
Simon Willison 挖出 Anthropic 提示词指南里的一个小技巧：给 Fable 5.2 说"这个代码库是你的"，它改代码就没那么缩手缩脚。经常让 Claude 重构老项目的人可以马上试试，一行提示词就能改变模型行为。
Simon Willison 指出，Anthropic 每次发布新模型都会同步更新官方提示词指南，这次针对 Fable 5.2 的指南中有一个实用技巧。该技巧用于解决模型在改进现有代码时过于谨慎的问题。
具体做法是在提示词中告诉模型"This codebase is yours"（这个代码库是你的）。这句话能降低 Fable 5.2 在重构和改进既有代码时的保守倾向，让它更敢于做出实质性修改。该指南托管在 platform.claude.com/docs，Willison 称其为一条有趣的（entertaining）提示词技巧。
这类官方提示词指南的迭代细节往往不写进发布博客，但对依赖 Claude 做代码开发的团队有实际影响：模型的谨慎程度直接决定自动化重构任务的产出质量。
When Anthropic release a new model it's always worth taking a look at their updated prompting guide - here's an entertaining tip to make Fable 5.2 less likely to be cautious in how it improves existing code: tell it "This codebase is yours" platform.claude.com/docs/en/build-…📊 111 ⚡
This report is categorized under AITOP's "How-to" desk, focusing on US frontier AI labs and Silicon Valley technology leaders. Within our cross-regional analytical framework, it directly maps to AI developer toolchains, coding agents, and engineering workflows and US-China foundation model benchmarks and commercialization comparison. Key entities and technical topics under continuous tracking include Anthropic, Claude, 提示词工程, Fable 5.2.
Source attribution: curated from Simon Willison (@simonw). Cross-source corroboration: 11 independent sources have covered this development (including claudedevs, Alex Albert, Cursor), confirming industry-wide signal strength.
