agentSafeGuard for x402 payments over MCP (`@x402/mcp`)

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Issue 类型
功能
描述清晰度
基本清楚
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活跃
技术栈
typescript
领域
payments

调研方向

Start in sdk/README.md to see where the agentSafeGuard usage section goes, and find the guard's origin option in the SDK source. Before coding, comment on the issue, because the issue leaves open whether a guard.mcp(...) helper is needed and a new dependency must be discussed first. Done means a test with an in-memory x402-paid MCP server passes: a call at the pinned price to the pinned payee is paid, and a swapped payee is refused with payee_mismatch and zero signatures. The README section must also be added.

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描述

help wanted integration

Some agents pay per MCP tool call: the x402 client in @x402/mcp handles a payment-required tool result instead of an HTTP 402. The policy is the same, but the "origin" is the MCP server the owner configured.

What: show that agentSafeGuard works with the @x402/mcp client, using the guard's fixed origin option set to the MCP server URL. Or propose a small guard.mcp(...) helper if the hooks need more context.

Acceptance:

  • A test with a minimal x402-paid MCP server (in-memory transport is fine): a tool call at the pinned price to the pinned payee is paid; a swapped payee is refused (payee_mismatch) with zero signatures.
  • A short section in sdk/README.md.

New to the repo? Start with CONTRIBUTING.md. Every outside PR goes through the review gates in docs/REVIEWING.md. Please discuss any new dependency in this issue first. Comment here before starting, so two people don't build the same thing.

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从这里开始

  1. 先读完整个 Issue,再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

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