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HarnessTax: How Much Does the Harness Matter for Coding Agents?

233 points · 99 comments · matt_d

  1. jswelker · · focus · HN ↗
    Much of the extra weight of Claude Code and Codex harness are (ostensibly?) for security and alignment purposes. Whether they are effective is an open question, but leaving those dimensions out and calling it a tax is disingenuous, just turning insecurity into a negative externality.

    "Why pay the waste disposal tax? Dumping into the ocean is free!"

    Pi actively omits any sort of guardrails and sandboxing in the name of speed and simplicity, so it is not shocking that it is faster and simpler.

    Doubling the cost of something in the name of vague security is standard operating procedure for big enterprises, maybe even quite cheap.

    1. vhantz · · focus · HN ↗
      Claude Code's initial instructions to a model are a dump of 80kb of text. And none of it has anything to do with security. The "security" is handled by the evaluator model that sometimes denies some tool uses. I'm sure that in itself can be done very cheaply.
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