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

With no annotations, the description carries the full behavioral burden. It discloses the outcome domain (approved vs rejected) and that the call is a check, but omits whether other statuses exist (pending/expired), whether checking consumes or mutates the card/token, and any auth or rate-limit behavior implied by card_token.

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 tight sentences with the core action front-loaded and the actionable constraint second. Efficient, though the trailing instruction is phrased loosely enough to be slightly ambiguous.

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?

For a two-parameter tool with zero schema descriptions, no annotations, and no output schema, the definition is thin: the return shape and full set of possible status values are left unspecified. An agent cannot tell whether 'status' has values other than approved/rejected or what to do with an unrecognized result.

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 0%, so the description must compensate and it does not. It merely restates both parameter names ('card_id and card_token') without explaining what a card_token is, where it comes from, or its format/validity, adding no meaning beyond the schema keys.

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 ('Check') and resource ('approval card') and names the two inputs that identify it, so the agent knows exactly what the tool returns: an approved/rejected decision. It does not, however, differentiate itself from the somewhat adjacent sibling check_action, so it falls short of a 5.

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 line 'Only act when status is approved' gives a conditional gate for what to do with the result, which is useful implied usage. But it never says when to call this tool versus check_action or any other sibling, nor what to do on a rejected/expired outcome.

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