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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the agent knows this is safe. The description adds the tier-related behavioral detail that service/premium packs include readiness evidence, but it does not disclose the potential network probing behavior implied by paid_path (though the schema covers that). With annotations providing the core safety profile, this is adequate but not rich.

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 sentences long, front-loads the core purpose, and packs in the essential input guidance and tier pricing without any fluff. Every sentence earns its place, making it highly efficient and well-structured.

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?

Given the tool's complexity (11 parameters, output schema present), the description gives a solid high-level overview of the main inputs and outputs. It doesn't mention every parameter, but the schema descriptions and output schema fill in the gaps. It could have noted the existence of optional parameters like method or expected_resources, but the description is still complete enough for an agent to understand the tool's role and basic usage.

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?

Schema description coverage is 100%, so the schema already documents all 11 parameters. The description names several key optional parameters (product_name, audience, primary_use_case, marketplace_url, paid_path) and clarifies that target is required, but it repeats tier pricing already in the schema. It adds only marginal meaning beyond the schema, such as tying readiness evidence to service/premium tiers.

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 clearly states a specific action ('Generate marketplace-safe launch assets') and specifies the resource (x402/MCP seller) and the exact deliverables (listing copy, buyer FAQ, checklist, approval packet, claim boundaries). It is unmistakably distinct from sibling tools like probe_x402_paid_path or scan_x402_resource, which focus on validation rather than asset generation.

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 description provides clear context for when to use the tool: when a seller needs launch assets. It explains the basic input pattern ('Pass target plus optional...') and notes tier-specific behavior. However, it does not explicitly state when not to use it or mention alternative tools, so it falls just short of a 5.

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