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swyx (shadcn) announced on 2026-06-10 that Claude Fable is available for only a…

2026-06-10 · 13:17 UTC ·@swyx ·0 min read

Brief

swyx announced on 2026-06-10 that Claude Fable will be available briefly and recommended using a new /improve command: run the strongest model to audit your repository, surface bugs, perf problems, tech debt and missing tests, then produce step-by-step plans any cheaper model or agent can execute to implement fixes or features.

Why it matters

swyx (shadcn) announced on 2026-06-10 that Claude Fable is available for only a few days.

Key details

  • He introduced a new /improve command that uses the most capable model to audit a codebase and generate actionable plans for cheaper models or agents to execute.
  • /improve inspects code to identify bugs, performance issues, technical debt, missing tests, and feature ideas, and outputs runnable plans.
Source evidence

wooh

shadcn (@shadcn)

You have Claude Fable for only a few days. Here's how to make the most of it.

Introducing /improve: use your most capable model to audit your codebase and write plans for cheaper models to execute later.

Studies your code, figures out bugs, perf, tech debt, missing tests, what to build and writes plans any agent can run.

— https://nitter.net/shadcn/status/2064671802509410806#m