trace_email_delivery

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

No annotations are supplied, so the description carries the full disclosure burden and does not meet it. Critically, it never says whether tracing actually dispatches a test message to the recipient (a real side effect with deliverability/abuse implications) or is a passive lookup, nor does it mention required privileges or rate limits.

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?

A single front-loaded sentence with no filler; the verb and resource come first and the purpose clause follows. It is efficient, though its brevity is part of why behavioral details are missing rather than a flaw of wordiness.

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 no-annotation, no-output-schema diagnostic tool, the one-sentence description leaves important gaps: what a 'trace' returns (hops, SMTP responses, routing rules?), whether it sends mail, and how long it takes. The input side is fully covered, but the behavioral side is not.

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?

There is one parameter with 100% schema description coverage ('Recipient email address to test delivery for'), so the schema already documents it fully. The description adds nothing beyond reiterating that the target is an email address, which is the baseline-3 case.

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+resource pair ('Trace mail delivery and routing path') targeted at an 'email address' and states the goal ('debug delivery failures'). That is distinguishable from nearby siblings like trace_email_filter (filters) and get_email_routing (configuration), though neither is named explicitly.

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 phrase 'to debug delivery failures' gives an implied when-to-use condition, which is more than nothing. However, it never says when to prefer this over get_email_routing, trace_email_filter, validate_spf, or validate_ptr_records, so the agent has to infer the boundary between delivery-tracing and adjacent mail/DNS diagnostics.

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