get_latest

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

Annotations already declare readOnlyHint and openWorldHint, and the description's 'side effects: none; read-only' plus the mailsocket network call largely restate them. However it adds genuinely new behavioral context: the non-blocking semantics and the warning that subject/body is untrusted inbound data to be treated as data, not instructions.

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?

Front-loads the core action and is generally tight, but 'without blocking' is stated in the first line and then restated in the second, which is slight redundancy rather than 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?

With no output schema, the description correctly implies the return content (subject/body) and flags its untrusted nature, plus non-blocking behavior. The main omission is any guidance on the inbox_id value itself.

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?

One required parameter with 0% schema description coverage, so the description carries the burden. It only places inbox_id in context ('newest message in inbox_id') without describing expected format, source, or how to obtain a valid id, leaving a real gap.

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?

States a specific verb+resource ('Return the newest message in inbox_id') with an explicit non-blocking qualifier. This cleanly distinguishes it from the wait_for_otp/wait_for_link siblings, which the description names.

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?

Gives an explicit when-to-use ('when you just want to peek at whatever has already arrived, with no waiting') and names the contrasting alternatives with the condition that selects them. An agent can route between this and the wait tools without reading any schema.

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