x402_approve_service

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It states the action ('approve') but does not mention side effects, reversibility, permission requirements, or what happens after approval. This is a significant gap for a mutation tool.

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

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

The description is two short sentences, front-loaded with the action and scope. Every word contributes to clarifying purpose and usage context. No unnecessary information.

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

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

The tool is simple with 3 parameters and no output schema. The description explains the action and a specific usage scenario, but lacks details about effects, reversibility, or prerequisites. Given the mutation nature and no annotations, it is minimally viable but not rich in context.

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

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

The input schema already provides high coverage (100%) with descriptions for 'name', 'domain', and 'maxPayment'. The description adds minimal parameter meaning beyond the schema, only hinting that the domain is for 'x402 payments'. This meets the baseline for high schema coverage.

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

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

The description uses a specific verb ('Approve') and resource ('a service domain for x402 payments'), clearly distinguishing this from siblings like x402_remove_service or x402_list_approved_services. The mention of 'strict allowlist mode' adds specific context.

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

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

The statement 'Required in strict allowlist mode' provides a clear condition for when to use this tool. While it doesn't explicitly list alternatives or say when not to use it, the context is clear enough for an agent to determine relevance.

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