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

Beyond the annotations, which already establish read-only, idempotent, open-world, and non-destructive behavior, the description adds the data source, the output shape (yes/no, partial vs full lapse, exact OPM wording, posted timestamp), and important limitations about forecasting and agency staffing decisions. It also discloses the cost of one credit.

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 front-loaded with the core question and is generally efficient, with each sentence adding useful scope, output, or limitation detail. It is slightly longer than strictly necessary for a no-parameter tool, but there is little wasted wording.

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 simple read-only lookup with no parameters and no output schema, the description is complete: it explains what question is answered, what source is used, what the response includes, and what the tool does not cover. An agent has enough information to call it correctly.

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?

The tool has zero parameters, so there is no parameter semantics to explain and the baseline is 4. The description correctly adds no irrelevant parameter detail.

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 gives a specific verb and resource: it answers whether the US government is shut down right now using OPM's current operating status, and it explains that partial and full lapses are distinguished. It does not explicitly differentiate itself from the sibling tool us_government_operating_status, so it falls short of a 5 despite being otherwise precise.

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 implies the use case through the direct question 'Is the US government shut down right now?' and gives one scope limitation: it does not forecast funding deadlines. However, it never names an alternative tool such as us_government_operating_status or opm_status_history, so routing guidance is left implicit.

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