EvoSpark: Endogenous Interactive Agent Societies for Unified Long-Horizon Narrative Evolution

TL;DR

EvoSpark is a framework that enables long-horizon, coherent narrative evolution in multi-agent systems by employing memory, alignment mechanisms, and a unified engine to sustain story consistency.

Contribution

It introduces a novel architecture combining memory, alignment, and grounding protocols to maintain logical coherence in evolving narratives within agent societies.

Findings

EvoSpark outperforms baselines in generating coherent long-term narratives.

The framework effectively resolves conflicts and maintains spatial and relational consistency.

Experiments show sustained, expressive story evolution in diverse scenarios.

Abstract

Realizing endogenous narrative evolution in LLM-based multi-agent systems is hindered by the inherent stochasticity of generative emergence. In particular, long-horizon simulations suffer from social memory stacking, where conflicting relational states accumulate without resolution, and narrative-spatial dissonance, where spatial logic detaches from the evolving plot. To bridge this gap, we propose EvoSpark, a framework specifically designed to sustain logically coherent long-horizon narratives within Endogenous Interactive Agent Societies. To ensure consistency, the Stratified Narrative Memory employs a Role Socio-Evolutionary Base as living cognition, dynamically metabolizing experiences to resolve historical conflicts. Complementarily, Generative Mise-en-Sc\`ene mechanism enforces Role-Location-Plot alignment, synchronizing character presence with the narrative flow. Underpinning these is the Unified Narrative Operation Engine, which integrates an Emergent Character Grounding Protocol to transform stochastic sparking into persistent characters. This engine establishes a substrate that expands a minimal premise into an open-ended, evolving story world. Experiments demonstrate that EvoSpark significantly outperforms baselines across diverse paradigms, enabling the sustained generation of expressive and coherent narrative experiences.