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

Annotations already indicate readOnlyHint and idempotentHint. The description adds meaningful behavioral details: not metered, includes last-delivered time and total deliveries, and the signup-link behavior for missing accounts. No contradiction with annotations.

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 compact sentences, front-loaded with the primary action. The parentheticals add necessary context (definition, metering, account requirement) without unnecessary verbosity.

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 no-parameter list tool with no output schema, the description covers the essential return fields (last-delivered time, total deliveries), the account prerequisite, and metering. It lacks explicit pagination details but is adequate for a simple listing operation.

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 tool has zero parameters and schema coverage is 100%, so the baseline is 4. The description does not need to explain parameters and does not add anything beyond the empty schema.

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 'List your organization’s Alerts' with a specific verb and resource, and explains what alerts are (persistent rules firing to Slack/webhooks). However, it does not distinguish this tool from the sibling 'get_alerts', which could be a similar listing operation.

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?

Provides useful context: 'Not metered' and requires a free Prowlo account, with an unusual call-to-get-signup-link behavior. This gives clear context for when to use the tool, but it does not explicitly mention alternatives or exclusions relative to sibling tools like get_alerts.

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