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

Annotations already declare readOnlyHint=true, idempotentHint=true and destructiveHint=false, so the safety profile is covered. The description adds genuinely new behavioral context: there is no toggle to read, and the check is a diagnostic of whether server-side pageviews are arriving, which prevents the agent from misreporting collection as enabled. It doesn't say what the response contains or whether results can be stale.

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?

Three short sentences, front-loaded with what is checked, then the crucial 'no on/off toggle' caveat, then the operational instruction. Nothing is padded or redundant.

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?

There is no output schema, so the description carries some burden for explaining what a status result conveys; it does this at a high level (collector receiving data, Analytics available, ingest key available) but doesn't describe the shape or possible values. For a two-parameter read-only diagnostic it is otherwise complete enough to call 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?

Schema description coverage is 100%, so the app and environment parameters are already documented, including the production default and the orgSlug/appSlug format. The description only reinforces that the check is per-app ('check each app'), which is marginal added meaning. Baseline 3 is appropriate.

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 ('Check whether') and a precise object ('an application's Cookieless visitors collector is receiving data'), plus the secondary checks for Analytics and server ingest key availability. That is far more informative than the title alone. It does not explicitly contrast itself with the nearby get_cookieless_report or get_cookieless_install_instructions tools, so an agent must infer the split from names.

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?

'Check each app before claiming collection is enabled' gives a clear trigger condition and implies per-app iteration. The key usage caveat — that there is no on/off toggle and forwarding is the responsibility of the website — is stated. It stops short of naming alternative tools or describing when this check is unnecessary.

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