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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds nothing beyond that — no note on whether the returned card data is masked, pagination, or empty-state behavior.

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 same endpoint string is repeated verbatim in two consecutive sentences, so the only content-bearing line is the operation-ID/schema pointer. It is short but not front-loaded with anything useful.

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, 0% parameter coverage, and a free-form query object, the description should carry the load — instead it supplies nothing about inputs or return shape beyond the URL.

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% for a nested 'query' object with free-form additionalProperties, and the description gives no hint about what query keys are accepted or what the empty 'params' object means. The agent has to fall back to describe_operation with no help here.

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 only echoes the endpoint path twice; it restates the name rather than saying what the tool returns (a list of the tenant's stored payment methods) or how it differs from siblings like get_subscription_billing_check or get_subscription_usage_summary.

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 or when-not-to-use guidance is given. The only directional hint is that 'describe_operation provides native request schemas', which points at a discovery tool but not at the criteria for choosing this operation.

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