EREBOTS 4.0 is an open-source hybrid multi-agent framework for conversational assistants. Language-model agents plan and route work, deterministic MCP tools compute exact results, and specialist agents communicate through A2A. The framework adds agents by URL configuration and manages identity, consented user context, task states, and traces. Its A2A server passed 97 official compatibility-kit requirements.

Provides a concrete reference architecture for teams combining language-model routing, deterministic tools, and interoperable specialist agents while preserving task state and traces.

The paper formalizes how judges in multi-agent debates should distinguish repeated evidence from independent corroboration. It introduces a lineage quotient, establishes replication-invariance and information-limit results, extends the construction to QBAFs, and audits the framework across synthetic and AVeriTeC-derived profiles.

For engineers designing verdict logic, the paper supplies failure conditions, formal invariants, and a representation for testing dependence-sensitive aggregation.