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

Annotations already declare readOnlyHint and idempotentHint, so safety and repeatability are covered. The description adds the substantive detail that the response covers plan, active-link count, and entitlements, which is genuinely useful framing. It does not say whether counts are real-time or whether the response is scoped to a single workspace, but with annotations carrying the behavioral profile a 3 is appropriate.

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 short sentence with no filler, and the key content (plan, usage, entitlements) is front-loaded. The phrasing 'what is included' is slightly vague but not wasteful.

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 and no parameters, so the description is the only source of information about what comes back. It lists three content areas but leaves the exact shape of the response (field names, nesting, units of usage) to be discovered at call time.

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 the baseline is 4. There is nothing for the description to disambiguate.

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 is a noun phrase describing the data returned — the plan, active-link usage, and included entitlements — rather than stating a verb, so the agent must infer that this is a read of account-level details. Because none of the siblings (create_link, get_link, get_link_stats, list_links) touch account data, the resource alone does distinguish it from alternatives.

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?

There is no explicit when-to-use guidance, no prerequisites, and no mention of alternatives such as get_link_stats for usage metrics. The agent can infer it is the account-level lookup, but nothing in the text says so.

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