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

The annotations already convey readOnly, idempotent, non-destructive behavior. The description goes further by disclosing the report's granularity (component by component) and the presence of uptime and timestamp information, which is useful behavioral and output context beyond the annotations.

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 a single focused sentence that front-loads the main action and then efficiently enumerates scope and return contents. It has no filler, repetition, or unnecessary detail.

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-input, read-only status tool, the description covers enough context: monitored components, uptime, and timestamp. It could optionally mention the shape of the status field, but nothing critical is missing for selecting or invoking this 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?

The tool has zero parameters, so the input schema is complete at 100% coverage and there is no need for parameter documentation. The description still adds value by clarifying what the returned report will contain.

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 clear verb and resource: it says exactly what it does: 'Report whether Genpio is up right now.' It also names the components covered (public API, AI agent backend, Meet streaming backend), which distinguishes it from sibling tools like genpio_overview and the list_* tools.

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 clearly implies the tool is for real-time status checks of Genpio's components. It does not explicitly contrast it with genpio_overview or list_* tools, but the context is clear enough for a no-parameter status tool.

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