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arXiv · 2605.03143

Pact: A Choreographic Language for Agentic Ecosystems

Kiran Gopinathan·Jack Feser·Michelangelo Naim·Zenna Tavares·Eli Bingham
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Abstract

Recent advances in large language models have led to the rise of software systems (i.e. agents) that execute with increasing autonomy on behalf of users in open, multi-party settings, interacting with untrusted counterparts and managing private information. Choreographic programming offers correct-by-construction protocol-design for such settings, but assumes cooperative participants -- it has no notion of agent self-interest, that is, why an agent will follow a protocol. In this talk we introduce Pact, a choreographic language extended with operations to describe agent choices and preferences, drawing from the rich literature of game theory. Every Pact protocol maps to a formal game, allowing protocol designers to reason about game-theoretic properties of their protocols, such as solving for decision policies. We present Pact's design and a preliminary implementation -- a bounded-rational solver that computes decision policies over Pact protocols -- and findings from applying this language to multi-party coordination with self-interested agentic participants.

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Kiran Gopinathan, Jack Feser, Michelangelo Naim, Zenna Tavares, Eli Bingham. 2026-05-04. Pact: A Choreographic Language for Agentic Ecosystems. https://arxiv.org/abs/2605.03143

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