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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is fully covered by structured data. The description adds real context beyond that: the data is scoped to the authenticated user and includes quota usage rather than a generic lookup. It stops short of describing auth failure behavior or freshness of the quota figure, so it is useful but not rich.

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 with no filler, and the resource leads before the field list. The parenthetical about get_account_status is the only element that reads as clutter rather than routing information.

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?

Annotations cover safety, an output schema exists so return values need no explanation, and the single optional parameter is fully documented in schema. The description covers identity scoping and the returned fields, which is most of what an agent needs. Only the unauthenticated case and the get_account_status relationship are unaddressed.

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?

Only one optional parameter exists and schema description coverage is 100%, so the schema already carries parameter meaning. The description's phrase 'current authenticated user' implicitly tells the agent this tool is session-scoped, which is mild added value, but it never explains what supplying session_id does or when to omit it. Baseline 3 is appropriate given the schema does the heavy lifting.

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?

States a specific verb (get) and resource (the current authenticated user's profile) and enumerates what is returned: email, membership tier, and active short link quota usage. That is enough to separate it from siblings like list_my_links or get_link_analytics. The trailing 'compatible with get_account_status' reference points at a tool that isn't in the sibling list, which slightly muddies rather than sharpens the 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?

The description implies usage by saying it targets the 'current authenticated user', so an agent can infer it needs a logged-in session, and the get_account_status mention hints at an alternative. However, there is no explicit when-to-use/when-not-to-use statement, no note about what happens when unauthenticated, and no guidance on choosing between this and get_account_status.

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