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

Annotations already declare write/idempotent/destructive, but the description adds context the annotations cannot convey: that the operation may pause collection and, importantly, that it does not change payment methods or create charges and that existing billing rules apply. This is useful, non-obvious behavioral disclosure.

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?

Four short sentences, front-loaded with the action and its trigger, then the side effect and the billing clarifications. No filler, though the telegraphic style leaves some terms ('the cap') slightly underspecified.

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 no explanation, and annotations cover the safety profile. The description covers billing and collection side effects but omits parameter meaning and any sibling routing, leaving gaps for a 2-parameter mutation tool.

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 both required parameters, and the description does not name or explain workspace_id or monthly_row_limit. 'The cap' loosely maps to monthly_row_limit but workspace_id is entirely undocumented, so the description fails to compensate for the coverage gap.

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 ('Save the cap') and, combined with the name/title, makes clear this sets a workspace's monthly row limit. However, 'the cap' is indirect and there is no explicit differentiation from the many sibling workspace tools.

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?

'Save the cap after the user confirms in the usage panel' gives a clear trigger condition (post-confirmation in the usage panel), which is genuine usage guidance. It offers no when-not conditions and does not name any alternative tool, so it remains implied rather than explicit.

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