I Read the Claude Code Source Code. Here's Everything You Can Configure That the Docs Don't Tell You.

André Figueira went spelunking in the Claude Code source and surfaced the configuration surface the docs keep quiet about: PreToolUse hooks that can rewrite tool input mid-flight, force permission decisions, or inject conversation context; hook attributes (once, async, asyncRewake) for non-blocking safety checks; skill frontmatter for model and effort overrides plus disable-model-invocation; and per-agent persistent memory via memory: project or memory: user. The strangest finds are the self-improvement flags — autoMemoryEnabled and autoDreamEnabled — which extract learnings from sessions and consolidate them on a 24-hour cycle. Useful as a reference, and as a reminder that the interesting parts of an agent harness live below the documented API.

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