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mizukaizen

@melis-ai/x402-tools-mcp

by mizukaizen

notifyrelay_webhook

Send JSON payloads to a public webhook URL with optional HMAC signing for authenticated notifications. Only allowlisted domains can be used.

Instructions

[$0.001 USDC] POST a JSON payload to a public URL with optional HMAC signing. Allowlisted domains only.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
secretNo
payloadYes
target_urlYes
Behavior2/5

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

No annotations provided, so the description bears full responsibility. It states the operation is a POST, but does not disclose if the call is idempotent, destructive, rate-limited, or whether authentication is required. The allowlist restriction is noted but lacks detail on how it is enforced.

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

Conciseness4/5

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

The description is one concise sentence, front-loading the core action and constraints. However, the inclusion of pricing in brackets is slightly distracting but does not detract much.

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

Completeness2/5

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

Given no output schema and complex parameters (nested object, required secret for signing), the description is insufficient. It does not explain return values, error handling, or how to configure the secret for HMAC signing. The allowlist domain restriction is vague.

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

Parameters2/5

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

Schema coverage is 0%, so the description must add meaning. While it mentions 'HMAC signing' hinting at the secret parameter, it does not explain target_url format, payload structure, or the relationship between params. The description adds minimal value beyond the schema.

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 action (POST a JSON payload to a public URL) and key characteristics (optional HMAC signing, allowlisted domains). It effectively distinguishes this webhook tool from siblings like email or telegram notification tools.

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

Usage Guidelines2/5

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

No guidance on when to use this tool vs alternatives (e.g., notifyrelay_email or notifyrelay_telegram). The only constraint mentioned is 'Allowlisted domains only', but no context on prerequisites or typical use cases.

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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