Preventing Multi-Agent Hallucinations: Pass Typed Contracts, Not Prose
Downtown_Extension_6 · reddit · 2026-08-01
The author shares a pattern that fixes a frustrating class of bugs in multi-agent systems: using typed contracts instead of prose for inter-agent communication.
The Problem: In a pipeline where Agent A passes a paragraph of reasoning to Agent B, Agent B re-interprets the text based on its own biases. This leads to quiet semantic drift (e.g., misinterpreting "weak momentum" as a negative signal) that is incredibly hard to debug. The issue compounds with every agent in the chain.
The Fix: Agents no longer pass raw text. Instead, they pass validated objects with a fixed schema (e.g., using Pydantic models with strict enums and data types). This removes the ambiguity of natural language and prevents downstream models from rewriting the intended meaning.
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