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

Annotations already indicate this is not read-only, not destructive, and not open-world. The description adds the domain-specific purpose of adding a payment card, but does not disclose token expiry, one-time use, permission requirements, or other behavioral details an agent might need.

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 short and front-loaded, with no extraneous sentences. It does repeat the title almost verbatim, which is slightly redundant but not harmful.

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?

An output schema exists, so return values need not be explained. However, for a non-read-only link-generation tool, the description lacks usage guidance and key behavioral context such as link lifetime or security constraints.

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 single workspace_id parameter is fully described in the schema, including behavior when omitted. The description does not add any parameter semantics, but with 100% schema coverage the baseline score of 3 is appropriate.

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 states a specific action and resource: generating a magic login link to add a payment card. It is clear enough to distinguish from many siblings, though it does not explicitly contrast with nearby tools like generate_login_link or get_remove_card_login_link.

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 implies the link is used to add a card, but gives no explicit guidance on when to use this tool versus generate_login_link, get_remove_card_login_link, or related login-link tools. No prerequisites or exclusions are stated.

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