LedgerAgent

LedgerAgent: Structured state ledger improves policy-adherent tool-calling agents

LedgerAgent is an inference-time method that maintains explicit task state in a separate ledger rather than leaving state reconstruction implicit in the prompt, addressing two failure modes: stale/incorrect grounding and policy-violating tool calls. The ledger is used both to render current state into the prompt and to gate environment-changing tool calls against state-dependent policy constraints. Evaluated across four customer-service domains with a mixed panel of open- and closed-weight models, LedgerAgent improves average pass^k over standard prompt-based tool-calling, with the largest gains under stricter multi-trial consistency metrics.