Abstract This paper develops a structured account of agency under cognitive uncertainty and irreversible action. It distinguishes three dimensions of practical deliberation: (i) normative entitlement to initiate or suspend action, (ii) epistemic pressure arising from temporal instability of self-assessment, and (iii) external irreversibility constraints embedded in action-dependent world states. The central thesis is that practical stability is neither a function of epistemic correctness nor external consequence alone, but of their weighted interaction under conditions of irreversibility. To capture this interaction, the paper introduces a decision-weight framework in which epistemic revision pressure and external cost of reversal enter a comparative constraint relation. This framework resolves a persistent ambiguity in theories of practical reason concerning the relation between normative revision and action lock-in, without reducing agency either to introspective authority or external determinism.