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

The readOnlyHint annotation already establishes that this is a safe, non-mutating read, and the description reinforces it by identifying the endpoint and the returned record fields. It adds no behavioral context beyond that, such as pagination defaults, maximum page size behaviour across calls, or rate-limit characteristics. With annotations carrying the safety profile, this is adequate but thin.

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?

Three short sentences with zero filler: the resource identity and the record shape are front-loaded, and the endpoint reference is a compact trailing detail. Nothing could be removed without losing 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?

There is no output schema, so the description's disclosure of the returned array shape ({ created, email, reason, status }) is genuinely necessary and present. The remaining gap is the absence of any usage or pagination context for a tool with five optional filtering parameters, but the core information an agent needs to call it is there.

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 all five parameters (email, limit, offset, start_time, end_time) are already documented in the schema with ranges and units. The description adds no filtering syntax or format detail beyond the schema, so the baseline score of 3 applies.

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 verb and resource ('List bounced email addresses') and disambiguates the underlying concept by naming it 'the bounce suppression list', which separates it from sibling tools like sendgrid_list_global_unsubscribes. It does not, however, explicitly contrast itself with any sibling tool.

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?

There is no guidance on when to use this tool versus alternatives, no mention of prerequisites, and no exclusions. An agent must infer usage purely from the name and the concept 'suppression list'.

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