Lean Claude Code Harness

Distill the durable parts of Claude Code into a smaller, auditable harness. The goal is not feature parity. The goal is a runtime another engineer can understand, extend, and verify without reverse-engineering hidden behavior.

When to Use

Use this skill when a coding-agent runtime shows any of these symptoms:

• config values are hard to trace
• tool permissions are implicit or inconsistent
• the tool surface keeps growing without clear ownership
• session history disappears after a run
• the main loop is hard to sketch from memory
• product-only logic is mixed into the harness core

Keep These Primitives