send_briefing_email

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

No annotations are provided, so the description carries full burden for behavioral disclosure. It doesn't state that sending is a side-effecting action, whether it requires authentication/permissions, whether it sends to a default recipient automatically, or that it could dispatch an email to a real user. A sending tool with zero annotation coverage should clearly disclose this mutation behavior.

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 efficient - two short paragraphs, no filler. However, the second paragraph is largely redundant with the first, restating the sending concept. It earns points for brevity but the repetition is a minor waste.

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 side-effecting send operation with no annotations and a rich set of sibling briefing/email tools, the description is incomplete. It doesn't specify where the briefing content comes from, whether it's the same as get_morning_briefing, what the email format looks like, or how it interacts with the many related scheduling/email tools. The output schema exists but doesn't compensate for the missing behavioral and selection logic.

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%, so both parameters (account, to_email) are already documented in the schema. The description adds minimal value by mentioning 'account to send from' and 'recipient email' context, but it doesn't explain how the briefing content is selected, what happens if to_email is null, or the relationship between the two parameters.

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 'Send the morning briefing as an email digest' with a clear verb (send) and resource (briefing email). However, it doesn't distinguish from siblings like send_email, create_email_draft, or get_morning_briefing - the agent may confuse sending the briefing with generating/retrieving it. The second paragraph adds minor elaboration but doesn't clarify how this differs from send_email.

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 says it's 'useful for receiving your daily summary in your inbox' but provides no explicit when-to-use guidance or exclusions. Among siblings like get_morning_briefing, get_daily_briefing, and send_email, there's no clarification on when to send vs. retrieve the briefing, or how this differs from the send_email tool for general email sending.

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