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

readOnlyHint=true already tells the agent this is a safe read, so the description only needs to add context. It does so by disclosing the shape of the result (aggregate views, per-link clicks, daily series) and its engagement-comparison purpose, which helps the agent decide whether the call answers the user's question. It does not mention scoping to the authenticated user's own profile or any history limits, which are minor gaps.

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?

Two sentences, front-loaded with the primary action and the returned data, with the engagement framing in the second sentence. No wasted words; the em-dash list is an efficient way to enumerate metrics.

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?

This is a simple read-only tool with one optional parameter and no output schema, and the description compensates for the missing output schema by summarizing what is returned. The only omissions are the implicit self-profile scoping and the time-window parameter, both of which are minor for a single-parameter 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?

Schema coverage is 100% and the single optional `days` parameter is fully documented in the schema with its default. The description never references the time window, so it adds nothing beyond the structured field — the baseline 3 applies.

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 names a specific verb and resource (analytics for the user's profile) and enumerates the returned metrics: total views, per-link click counts, daily breakdowns. That scope implicitly separates it from get_link_analytics, but the sibling is never named, so the agent must infer the profile-vs-single-link distinction.

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 — the phrase 'the user's profile' suggests this is the account-level rollup rather than a single-link view. There is no explicit statement of when to prefer this over get_link_analytics or get_profile, and no prerequisites or exclusions are given.

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