Update payment

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

Annotations already provide destructiveHint=true and readOnlyHint=false, and the description adds no extra behavioral context. It does not explain side effects, permissions required, reversibility, or what happens on update (e.g., whether old values are replaced or merged).

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 a single, focused sentence: 'Update an existing payment by payment_uuid.' It is concise, front-loaded, and contains no irrelevant information.

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 destructive nature (destructiveHint=true) and the nested 'params' object, the description is too sparse. It does not indicate what fields can be updated, how the params object should be structured, or what the response will look like. Since there is no output schema, this is a significant gap.

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 description mentions 'by payment_uuid' which clarifies the role of that parameter, but it provides no additional meaning for the 'params' object. With schema description coverage at only 50% and the params object being opaque (additionalProperties with no field details), the description does not compensate enough.

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 the action ('Update') and the resource ('an existing payment'), and identifies the unique identifier 'payment_uuid'. This distinguishes it from sibling tools like add_payment (create) and get_payments (list).

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 guidance is given on when to use this tool versus alternatives. It does not mention that add_payment is for creation, get_payments for listing, or any exclusions or prerequisites. The implied usage is obvious but not stated.

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