Free Lesson
Build an Agent Harness Like Claude Code
60 min
Oct 20, 2026 2:00 PM
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What you'll learn
Reverse-Engineer Claude Code's Agent Harness
Demystify the harness behind Claude Code, to build harness in your own product
Map the Agent Loop Behind Every Claude Code Prompt
Trace how a prompt becomes context and tool calls, and why the loop only ends when the model stops asking.
Gate Actions and Budget Context Like Claude Code
Use permissions and hooks to block risky actions, and decide what loads every turn versus on demand.
Why this topic matters
The model inside any agent can only write text. Everything that makes it useful and safe lives in the harness: the code that reads files, runs commands, checks each action against your rules, and decides when the work is done.
Most teams build this layer from scratch and learn its failure modes in production. Claude Code is a harness you can inspect step by step, and its patterns carry over to agents you build for your systems.
