feat: cross-merchant budget enforcement sample#252
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Ectsang wants to merge 4 commits intogoogle-agentic-commerce:mainfrom
Open
feat: cross-merchant budget enforcement sample#252Ectsang wants to merge 4 commits intogoogle-agentic-commerce:mainfrom
Ectsang wants to merge 4 commits intogoogle-agentic-commerce:mainfrom
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This pull request introduces a sample implementation demonstrating the budget enforcement gap in cross-merchant scenarios and provides a solution via an external budget authority. Feedback focuses on improving numerical precision by using round() for currency conversions, optimizing the performance of hold lookups to avoid O(N) complexity, ensuring unique identifiers by using full UUIDs, and enhancing type safety by replacing mixed-type dictionaries with dataclasses.
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Adds a sample demonstrating the cross-merchant budget enforcement gap from #207 and a solution using an external budget authority.
Part 1 shows the problem: two merchants evaluate
BudgetEvaluatorindependently, each with its ownMandateContext. The agent overspends ($120 on a $100 budget).Part 2 shows the fix: an external authority with four verbs (authorize, commit, refund, query) based on the discussion in #207. The authorize call atomically checks and holds budget, preventing race conditions.
No external dependencies. Runs with
python cross_merchant_budget.py.