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Robyn — Gasless Cross-Chain for AI Agents

by io.github.ox31461
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Verify a payment request before paying it

robyn_payment_request_verify

ALWAYS run this before paying a request you received. It confirms the payee address, chain, token and amount were signed by whoever controls the payee address, and that the request has not expired. If signedByPayee is false, DO NOT PAY — that is what an altered payee address looks like, and address substitution is the most common theft in this space. A valid signature proves AUTHENTICITY, not that the payment is owed and not that the payee is trustworthy.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "request": "<request>",
      "signature": "<signature>"
    },
    "name": "robyn_payment_request_verify"
  }
}

Input Schema

NameRequiredDescriptionDefault
requestYesthe canonical request object
signatureYesthe payee signature

Schema Changelog

Changes observed during successful MCP inspections.

  1. Added

TDQS

A4.8/5.0
Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden. It discloses the tool's security checks, the meaning of a valid signature, and the critical risk of altered payee addresses. It also clarifies what a signature does NOT prove, which is valuable behavioral context.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is compact yet information-dense, front-loaded with the imperative 'ALWAYS run this before paying'. Every sentence adds value, covering purpose, use, and critical warnings without redundancy.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The description thoroughly explains the tool's role and the key decision outcome (signedByPayee false → do not pay). However, since there is no output schema, it does not explicitly describe the return format or error behavior. While not fully complete in this respect, the essential behavioral outcomes are covered.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so baseline is 3. The description adds meaning by explaining that the signature parameter proves authenticity and that the request is checked for specific fields (payee, chain, token, amount, expiration). This enriches the reader's understanding of how the parameters are used.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the verb 'verify' and the resource 'payment request', and specifies exactly what it confirms (payee address, chain, token, amount, signature, expiration). It differentiates from siblings by mandating this step before paying and explicitly distinguishing between authenticity and whether payment is owed.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description gives explicit when-to-use ('ALWAYS run this before paying a request you received') and a strong when-not-to-pay condition ('If signedByPayee is false, DO NOT PAY'). It also warns about address substitution, providing actionable safety guidance.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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