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

Annotations already establish read-only, idempotent, non-destructive, closed-world behavior, so the safety profile is covered. The description adds real value beyond that by disclosing what the payload contains (working month, average days to decision, pending counts) and that it is a 'today' snapshot, which matters since no output schema exists.

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?

One tightly packed sentence that front-loads the resource and then the returned fields; every clause earns its place. The trailing 'Takes no arguments: {}' is redundant with the schema and is the only 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 zero-argument, read-only status tool, the description covers both the resource and the return contents, compensating for the absent output schema. Nothing an agent needs in order to call it correctly is missing.

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?

Zero parameters, so the baseline is 4. The description's 'Takes no arguments: {}' merely restates the empty schema and adds no meaning, but nothing is required of it either.

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 the exact data set (PERM and prevailing wage queue processing times) and enumerates the specific fields returned: current working month, average days to decision, and pending case counts by filing month. That content is unmistakably distinct from siblings like visa_bulletin and lookup_case, so an agent can route without opening any schema.

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 'DOL's processing times today' implies the usage context, but there is no explicit when-to-use or when-not-to-use guidance, and no mention of the plausible alternative estimate_decision, which also deals with decision timing. The agent must infer the boundary itself.

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