Pattern: Token Accounting Has Split Into a Distinct Tool Category Sitting Below the Agent

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Three separately-maintained projects now occupy the same layer: CodeBurn reads on-disk session files to price 41+ tools locally and flags waste like re-read files and unused MCP servers; caveman v2 interposes a local proxy that cut provider-reported input tokens 33.2% over 54 Claude Code runs; OmniRoute routes across 341 providers with quota-aware scheduling. None of them is a coding agent — all three assume you already have several and that the cost surface is now worth its own instrumentation. The common architecture is a local interposer or file reader, not a vendor dashboard, because no single vendor sees the whole spend.