TAG: Tangential Amplifying Guidance for Hallucination-Resistant Sampling

Diffusion models achieve state-of-the-art image generation but often produce semantic inconsistencies, or hallucinations . Existing inference-time guidance methods rely on external signals or architectural modifications, adding computational overhead. We propose T angential A mplifying G uidance (TAG) , a training-free, architecture-agnostic, plug-and-play guidance method that operates purely on trajectory signals. TAG uses an intermediate sample as a projection basis and amplifies the tangential components of the estimated score to correct the sampling trajectory. A first-order Taylor analysis shows that this steers the state toward higher-probability regions of the data manifold, reducing inconsistencies and improving fidelity while adding negligible overhead to existing samplers. Code is available at our Project Page (https://hyeon-cho.github.io/TAG/).