Fable 的判断力：Simon Willison 从 Claude Code 团队获得的效率技巧
Fable's judgement
Simon Willison 在 AIE 上与 Claude Code 团队交流后建议，让 Fable（以及 Opus）用自己的判断力工作，而非硬性规定行为。例如，直接让 Fable 自行决定何时编写测试，比给出具体规则更好。为应对价格即将上涨、节省 Fable token，Jesse Vincent 的另一个技巧是告诉 Fable 将较小任务委托给较低功耗模型（Sonnet 用于实质性实现、Haiku 用于机械修改），主循环保留判断、审计和数据合成等任务。Willison 已将提示词存入 Claude Code 记忆文件，实际效果良好，Fable token 消耗速度明显下降。
Simon 从 Claude Code 团队得到的实战技巧：别硬性规定 Fable 怎么写测试、用哪个模型，让它自己判断。他实测这条 prompt 能明显节省代币消耗，Fable 涨价前偷时间的利器。
Simon Willison’s Weblog
3rd July 2026
One of the most interesting tips I got from the Fireside Chat I hosted with Cat Wu and Thariq Shihipar from the Claude Code team at AIE on Wednesday was to let Fable (and to a certain extent Opus) use their own judgement rather than dictating how they should work.
The example they gave was testing. You can tell Fable "only use automated testing for larger features, don't update and run tests for small copy or design changes" - but it's better to just tell Fable to use its own judgement when deciding to write tests instead.
Jesse Vincent just gave me a related tip to help avoid burning too many of those valuable Fable tokens in the few days we have left before the prices go up. Tell Fable to use other models for smaller tasks, applying its own judgement about which model to use.
I prompted Claude Code just now with:
For all coding tasks use your judgement to decide an appropriate lower power model and run that in a subagent
Claude saved this memory file in ~/.claude/projects/name-of-project/memory/delegate-coding-to-subagents.md:
--- name: delegate-coding-to-subagents description: Simon wants coding tasks delegated to subagents running an appropriately lower-power model metadata: node_type: memory type: feedback originSessionId: 30068d78-43a9-4fb1-bb29-9799e18c526a ---Stated by Simon on 2026-07-03: "For all coding tasks use your judgement to decide an appropriate lower power model and run that in a subagent."
Why: cost/efficiency — implementation work rarely needs the top-tier model; judgment, review, and synthesis stay with the main loop.
How to apply: when a task in this project is primarily writing/editing code, spawn an Agent with a model override (sonnet for substantive implementation, haiku for trivial/mechanical edits) and a self-contained prompt; review the result in the main loop before committing. Design, auditing, data synthesis, and anything judgment-heavy stays in the main model. See also [[project-goals]].
So far it seems to be working well. I'm getting a ton of work done and my Fable allowance is shrinking less quickly than before.
3rd July 2026
来源：Simon Willison 博客 · simonwillison.net