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

Annotations already declare readOnlyHint=true, so the bar for additional disclosure is lower. The description adds value by specifying the return format ('Returns an array of { created, email, reason, status }') and the API endpoint, which are not covered by annotations. It does not discuss rate limits or other behaviors, but for a read-only list tool this is sufficient.

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 two short sentences, front-loaded with the verb and resource, and includes the return format and API reference with zero redundant information. It is highly efficient.

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?

The description is complete for a simple read-only list tool with 5 optional parameters. It explains the resource, the return shape, and the endpoint. However, it does not explicitly mention pagination behavior or parameter interactions, though these are covered by the schema. Given the absence of an output schema, the return format disclosure is valuable, so this merits a 4.

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 100%, so the baseline is 3. The description does not add any parameter-specific semantics beyond what the schema already provides, and it doesn't need to because the schema is fully descriptive.

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 uses a specific verb ('List') and a specific resource ('bounced email addresses' / 'bounce suppression list'), clearly distinguishing it from sibling list tools like sendgrid_list_global_unsubscribes and sendgrid_list_marketing_lists. It also mentions the API endpoint, reinforcing its precise purpose.

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 usage for listing bounces but does not explicitly state when to use it versus alternatives. It lacks exclusions or alternative recommendations, so it only provides implied guidance based on the resource name.

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