send_batch_emails

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

Adds the limitation of no attachments/scheduling beyond annotations. However, does not disclose potential partial failures, rate limits, or atomicity of the batch. With sparse annotations, more transparency would be beneficial.

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 brief, front-loaded sentences with zero superfluous words. Essential information is presented first.

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?

Lacks details on return value, partial failure handling, and batch atomicity. For a tool sending multiple emails, more context on error scenarios is expected, though it covers the main constraint (no attachments/scheduling).

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 coverage is 100% with detailed property descriptions. The description reiterates the 'full email object' concept but adds no new parameter-level meaning beyond what the schema provides.

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?

Clearly states 'send up to 100 distinct emails in one call' with a specific verb and resource. Distinguishes from siblings like send_email and send_broadcast by highlighting batch nature and limits.

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 clear context for when to use (multiple distinct emails) and explicitly excludes attachments and scheduling. Does not directly name alternative tools, but the sibling list and description imply proper use.

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