Technical Papers

Design papers and architecture documentation exploring PEtFiSh's engineering decisions.

• System Prompt Architecture

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  How PEtFiSh structures AI agent instructions with layered injection and on-demand loading.

• Token Cost Engineering

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  Reducing session costs by 20% through compaction frequency reduction and behavioral change.

• Companion Gateway Architecture

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  How the always-on interception layer works — design rationale, step evolution, and implementation mechanics.