{"type":"post","id":"stirrup-the-lightweight-framework-for-building-agents-a68ac4","slug":"stirrup-the-lightweight-framework-for-building-agents-a68ac4","title":"Stirrup: The lightweight framework for building agents","description":"Artificial Analysis has published Stirrup, an MIT-licensed Python framework and starting template for building agents with tools, sessions, and configurable model clients.","retrieval_nugget":"Artificial Analysis has published Stirrup, an MIT-licensed Python framework and starting template for building agents with tools, sessions, and configurable model clients. Its value for builders is practical rather than benchmark-based: the repository exposes a compact set of components teams can inspect, run, and adapt instead of committing to a fixed agent workflow.","published_at":"2026-11-07","updated_at":"2026-11-07","record_date":"2026-11-07","date_kind":"published_at","topics":["claude","claude-code","codex"],"entities":["Artificial Analysis","Stirrup","StirrupJS","Claude Code","Codex","OpenRouter","Brave","LiteLLM"],"related_patterns":["harness-architecture-outlives-model-choice"],"novelty_label":"new_fact","what_changed":"Teams can now inspect and rerun the open-source Stirrup scientific-copilot evaluation harness with the VIALS dataset and their own models, prompts, graders, and tool policies.","prior_refs":[],"source_url":"https://github.com/ArtificialAnalysis/Stirrup","source_urls":["https://github.com/ArtificialAnalysis/Stirrup"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"post:stirrup-the-lightweight-framework-for-building-agents-a68ac4","status":"published","visuals":[],"editor":{"role":"editor","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]},"routes":{"html":"https://newruntime.com/posts/stirrup-the-lightweight-framework-for-building-agents-a68ac4/","markdown":"https://newruntime.com/posts/stirrup-the-lightweight-framework-for-building-agents-a68ac4.md","json":"https://newruntime.com/posts/stirrup-the-lightweight-framework-for-building-agents-a68ac4.json"},"markdown_url":"https://newruntime.com/posts/stirrup-the-lightweight-framework-for-building-agents-a68ac4.md","next_reads":[{"type":"topic","path":"/topics/claude/","url":"https://newruntime.com/topics/claude/","title":"Claude","reason":"Explore the claude topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/claude.md","json_url":"https://newruntime.com/topics/claude.json"},{"type":"topic","path":"/topics/claude-code/","url":"https://newruntime.com/topics/claude-code/","title":"Claude Code","reason":"Explore the claude-code topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/claude-code.md","json_url":"https://newruntime.com/topics/claude-code.json"},{"type":"topic","path":"/topics/codex/","url":"https://newruntime.com/topics/codex/","title":"Codex","reason":"Explore the codex topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/codex.md","json_url":"https://newruntime.com/topics/codex.json"},{"type":"collection","path":"/posts/","url":"https://newruntime.com/posts/","title":"Field Notes","reason":"Open the latest editorial analysis.","media_type":"text/html","json_url":"https://newruntime.com/posts.json"},{"type":"collection","path":"/sources/","url":"https://newruntime.com/sources/","title":"Sources","reason":"See the original sources this archive cites.","media_type":"text/html"}]}