Fail-closed spend guard for x402 agent payments: stateful policy plugin, EIP-3009 replay middleware, and DrainBench — a reproducible adversarial drain benchmark
4 files for Claude Code, Codex and OpenCode: adversarial-review, caveman, agentpay-guard AGENTS.md, agentpay-guard CLAUDE.md — 2,431 tokens loaded in every session.
AGENTS.md A 2,426 tok CLAUDE.md A 5 tok .claude/skills/adversarial-review/SKILL.md A 143 tok .claude/skills/caveman/SKILL.md A 98 tok These files are theMobiusStrip/agentpay-guard's own configuration — they tell Claude Code, Codex and OpenCode how to work on this repository, so they are not mods to install elsewhere. Copy one as a starting point and replace the parts that are about this project.