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

No annotations are supplied, so the description carries the full behavioral burden. It discloses only a commercial trait (5 free trial calls per signed wallet) and omits card notation expectations, error behavior for invalid hands, and what the evaluation returns — significant gaps for a computation tool with zero annotation coverage.

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?

Two short sentences with the core purpose front-loaded. The emoji and trial-call promo are mildly extraneous but do not bury the main statement.

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?

With no output schema, no annotations, and an undocumented input format, the description should explain the shape of the result and the card string convention. Neither is present, so an agent must guess both the input syntax and what it gets back.

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 coverage is 0% for the single 'cards' parameter, which is typed only as a bare string. The description adds only the card count (5-7), leaving the encoding (e.g. 'As Kd Qh' vs 'A♠K♦Q♥') and delimiter format completely unspecified, so an agent cannot reliably construct a valid call.

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?

States a specific verb and resource ('Evaluate 5-7 card poker hands') and scopes the input size, which distinguishes it from the related x402-poker-equity sibling. However, it never differentiates itself explicitly from that sibling or state what output (hand rank, best hand) is produced.

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?

No when-to-use guidance, no prerequisites, and no mention of the alternative x402-poker-equity tool that a poker-adjacent agent could easily confuse this with. The only context is a pricing promotion, which does not help select the tool.

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