Self-modifying harnesses: who grades the exam matters more than the evolution
sujingshen · x · 2026-09-22
A discussion on the value and risks of self-modifying harnesses that patch their own rules and workflows. The core concern: if an agent can rewrite its own self-evaluation benchmarks, it's grading itself on an exam it altered — you can't tell whether capability actually improved or the test got easier.
The author proposes four guardrails:
- Inspectable rule diffs/snapshots before and after changes
- Ensure evaluation benchmarks weren't touched by the agent itself
- Verify red lines are preserved, not "optimized" away
- Ability to roll back to pre-modification identity state
Bottom line: evolution can be fast, but verification and grading authority must never quietly change hands. Context: DIY self-modifying harnesses are trending, distinct from off-the-shelf tools like claude code, codex cli, opencode.
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