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

No annotations are provided, so the description carries the full behavioral burden. It discloses the payload contents (spam signals, delivery history), which is genuine added value, but says nothing about permission requirements, behavior on a nonexistent ID, or whether the lookup is scoped to the caller's account.

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 economical sentence with the resource front-loaded and no filler. It is efficient, though its brevity reflects under-specification rather than tight editing.

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 annotations and no output schema, the description is the only source of behavioral signal, and it does usefully preview the return contents. However, it omits the parameter's meaning and any usage context, leaving the definition only minimally complete for a lookup tool.

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 description coverage is 0% and the description never mentions submissionId — where it comes from or what format it takes. The single parameter is self-evident from its name, but the description contributes nothing beyond the schema.

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 names a specific resource ('One submission') and enumerates what it carries ('spam signals and delivery history'), which distinguishes it from list_submissions and get_submission_stats. It stops short of an explicit retrieval verb, but the intent is unambiguous from the name-plus-description pairing.

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?

There is no guidance on when to fetch a single submission versus list_submissions or get_submission_stats, and no prerequisites or conditions are stated. The agent must infer usage purely from the tool name.

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