18 October 2026
Simon Willison releases llm-echo 0.5, a testing plugin for his LLM tool
First reported
Simon Willison ran this on .
- Simon Willison, a developer who writes about AI tools, released version 0.5 of llm-echo.
- llm-echo is a small debug plugin for his LLM command-line tool, which talks to AI models.
- It provides a model that simply repeats the input back, without calling any outside AI service.
Our read
Only one of the 30 newsletters covered this release, which is Simon Willison's own. It follows his llm-gemini 0.35 release on 2026-10-14 and an alpha tool release on 2026-10-13, both from the same thread.
Earlier on this story
Written by Newskeryx from which newsletters covered this story and from our own archive.
How it was covered
Simon WillisonDaily notes and links
The llm-echo 0.5 release, why it was revisited during LLM PR testing, and what the echo debug model does