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 the set of identity fields surfaced, but says nothing about what happens when no sign-in exists (error vs. authenticated=false), so added value is modest.

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 short sentences, zero filler: the first states what is returned, the second states the permitted use. The scope constraint is front-loaded where it matters.

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?

With zero parameters, rich annotations and an output schema, the description covers what the agent needs to choose and call it. The only real gap is unauthenticated/failure behaviour, which is neither in the description nor guaranteed by the schema.

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 there is nothing to disambiguate and the baseline is 4. The description correctly implies a parameterless call by describing only the current session.

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 ("Show") and resource ("the current Studocu sign-in") and enumerates the identity fields returned (authenticated, subject, clientId, scopes), so the agent can tell it is an identity/session inspection tool. It does not explicitly contrast itself with near-neighbours like get-context or get-project-state, which keeps it from a 5.

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 clause "Use only to check that login worked" gives an explicit usage boundary and implicitly rules out using it as a general context fetcher. It stops short of naming the alternative tool an agent should reach for when it actually wants project/course context.

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