Anthropic engineer's 5-step playbook for building agent harnesses that self-improve
nikola_mr64990 · x · 2026-10-27
A reposted thread quotes an Anthropic engineer explaining why harnesses beat hand-built multi-agent systems: run loops, use sandboxed tools, and turn execution logs into new skills for agents that are 10x more reliable on the same model.
His 5-step approach:
- Manage loops, context, and sandboxing through a harness
- Separate the brain from the tools for 60% faster first token
- Run agents server-side and recover from crashes using logs
- Make failures recoverable with retries and replays
- Turn past execution logs into memories so the system improves over time
Per the post, Anthropic calls this log-to-skill process "dreaming," and a short workshop walks through building one from scratch.
Related event: Anthropic Engineers Say Build Self-Prompting Agent Systems(3 posts)→
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