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

Annotations already declare readOnlyHint=true and destructiveHint=false, so safety is covered. The description still adds real value beyond them: it discloses that output is aggregated per billing cohort and explicitly guarantees no device tokens or individual recipients are returned, which matters for a privacy-sensitive read.

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 front-loaded sentence delivers the purpose, the exact breakdown of returned counts, and the privacy boundary, with no filler. Every clause earns its place.

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 must carry the return-value burden, and it does reasonably: cohort breakdown and the OneSignal flag are named. It stops short of describing the response shape (field names, nesting, zero-device case), but the essential contract is clear.

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 takes zero parameters, so there is nothing for the description to disambiguate. Baseline 4 applies; the schema being empty means no semantic gap exists.

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 states a concrete resource and what is returned: registered-device counts broken out by billing cohort and whether OneSignal is configured. The resource is distinct enough from siblings like get_setup_status or get_app_setup that confusion is unlikely, but it never explicitly routes against those overlapping 'is it set up' 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?

Usage is only implied — an agent infers you call this when you need to know if push is configured or how many devices are registered. There is no explicit when-to-use, no exclusion, and no mention of the nearest alternative (get_setup_status / get_app_setup).

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