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

Annotations already declare readOnlyHint, idempotentHint, non-destructive, and non-open-world behavior. The description adds substantive context beyond the annotations: it confirms the tool works for both authenticated and anonymous users and that it is free and does not count against rate limits. These are valuable behavioral details for an agent deciding whether to call it.

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?

The description is three tight sentences with zero waste. The primary purpose is front-loaded, followed by audience (auth/anonymous) and cost/rate-limit information, which is exactly the order an agent needs to make a quick call decision.

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 bears the burden of explaining the return shape. It lists the key fields (profile, subscription status, coins, XP, groups), which is sufficient for a zero-parameter read tool. Minor gaps include not describing the exact structure or nested objects, but overall it is 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?

The tool takes zero parameters, so the baseline is 4. The description does not need to explain parameter usage, and no parameter semantics are missing.

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 uses a specific verb ('Get') and resource ('current authenticated user information') and enumerates the returned fields (profile, subscription status, coins, XP, groups). It does not explicitly contrast with sibling tools like 'my_courses' or 'about_quizlink', but the scope is clear enough that an agent can distinguish it from most siblings.

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 notes that the tool works for authenticated and anonymous/freemium users, which implies broad applicability, and that it is a 'FREE call that does NOT count against rate limits,' which is a useful usage hint. However, it does not explicitly state when to use this tool versus alternatives (e.g., 'use this instead of my_courses when you need profile data') or name any exclusions.

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