Self-improving agents hit the Ship of Theseus problem: drift without errors
arpit_bhayani · x · 2026-08-19
Arpit Bhayani argues that agents that rewrite their own skill files or prompts face a classic Ship of Theseus problem: every self-edit replaces one more "plank" of the original spec, and after enough iterations you can no longer tell whether the agent is still doing the job it was built for.
The failure mode is drift, not crashes: the agent throws no errors, every patch looks fine in isolation, and it may even update its own checks along the way, masking the drift. His guardrails:
- Immutable core spec: separate goals and constraints from mutable parts; let the agent edit examples and phrasing, never the goal.
- Diff against the original spec, not just the previous version — comparing only to the last state hides compounding drift.
- Version every edit like a commit with a rollback path to any earlier version.
Takeaway: don't stop agents from improving, but make sure the task's identity is retained.
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