get_single_send_stats

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

Description adds 'Read-only' which is not in annotations (none provided). No additional behavioral traits (e.g., required permissions, rate limits) disclosed. Adequate but minimal.

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?

Single sentence with front-loaded 'Read-only' keyword. No filler words, every word adds value.

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?

No output schema, so return values are not described. Schema covers parameters well, but the tool's output (stats fields) remains unspecified. Adequate for a simple retrieval but could be more complete.

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?

Input schema has 100% description coverage for all 4 parameters. Description does not add any parameter context beyond what schema provides, so baseline score 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?

Description clearly states 'retrieve stats for one SendGrid Single Send' – a specific verb and resource. It distinguishes from the sibling list_single_send_stats which retrieves stats for multiple.

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?

Prefix 'Read-only' implies safe usage, and 'for one' indicates when to use this over list. No explicit exclusions or alternatives mentioned, but context is clear.

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