Use a known-good compiler to isolate failures

Published by Anthropic / Nicholas Carlini

This credits the original publisher. Better Loop membership or a shared assessment is not implied.

The public work

Carlini describes supervising parallel Claude agents building a C compiler. When agents collided on Linux build failures, he introduced comparisons with GCC and tighter regression checks to isolate faults and divide the remaining work.

What to notice

A clear task verifier and independent reference implementation can matter more than adding agents to an undivided problem.

Keep the context

This is a publisher-reported capability experiment with substantial resources. The compiler retained important limitations and dependencies; neither its build claims nor productivity claims were independently reproduced here.

AI use: Documented in the source.

The article identifies Claude Opus 4.6 running through Claude Code for the reported experiment.

A useful public example is not an assessment of a reader, a publisher or a Better Loop member.

Authored practice suggestion

Try the idea.
Check your own work.

Use material you are allowed to work with. This suggestion is preparation; it does not record a completed task or an improvement.

A prompt to adapt privately

Choose a small public transformation with a trusted reference implementation. Define representative and edge-case inputs, compare outputs, and isolate one mismatch into a minimal case. Ask for a focused fix and retain the failing case as a regression check before expanding the task.

A check to adapt

The minimal case reproduces the mismatch, the fix matches the reference, and existing checks remain satisfied.

Open a related practice brief

Private practice needs no account. Your configured model provider may process the evidence you select.

See the full skill-to-sharing flow

Another way into the work.

Iterate on a tolerant XML parser

Ronacher published a tolerant XML parser after earlier parsing approaches failed. He describes directing the initial implementation, reviewing it, requesting further fixes and an extensive test suite, and releasing the resulting library.

Published byArmin Ronacher

Curated public exampleCode

Code & software

Expose clipboard formats before debugging paste

Willison built a browser clipboard viewer while investigating rich-text paste. His public write-up links the code and conversation; the conversation shows requests to display available formats and then make long output easier to inspect.

Published bySimon Willison

Curated public exampleNotebook