llm-echo 0.3

Simon Willison’s Weblog Subscribe Sponsored by: WorkOS — Ready to sell to Enterprise clients? Build and ship securely with WorkOS. RELEASE llm-echo 0.3 — Debug plugin for LLM providing an echo model Mechanisms for testing tool calls. #3 Mechanism for testing raw responses. #4 New echo-needs-key model for testing model key logic. #7 Posted 31st March 2026 at 3:43 pm Recent articles Mr. Chatterbox is a (weak) Victorian-era ethically trained model you can run on your own computer - 30th March 2026 Vibe coding SwiftUI apps is a lot of fun - 27th March 2026 Experimenting with Starlette 1.0 with Claude skills - 22nd March 2026 This is a beat by Simon Willison, posted on 31st March 2026. llm 574 Monthly briefing Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments. Pay me to send you less! Sponsor & subscribe Disclosures Colophon © 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026