librus_logout

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

No annotations are provided, so the description bears full responsibility for disclosing behavior. It clearly states the exact state that changes ('cookies and tokens') and adds persistence context with 'Nothing is persisted to disk.' This goes beyond a bare verb and gives an agent a solid understanding of the tool's boundary, even though it does not explicitly describe post-logout authentication state.

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 with no filler, and the main action is front-loaded. The second sentence adds an important clarifier about disk persistence without redundancy.

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?

For a zero-parameter, no-annotation, no-output-schema tool, the description is largely complete: it says what is deleted, in what scope, and what is not deleted. An agent may need to infer that subsequent tool calls will require reauthentication, but that follow from the stated clearing of cookies and tokens and does not make the description inadequate.

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 has zero parameters and 100% schema coverage, so there are no parameter semantics to clarify. The description correctly does not mention parameters, and the baseline of 4 for no-parameter tools 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 states a specific action ('Clear all in-memory Librus cookies and tokens') with a concrete resource. It clearly distinguishes the tool from siblings like librus_get and librus_profiles by targeting session/logout state rather than profiles or data retrieval. There is no ambiguity about what the tool is for.

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 the tool is for logging out or ending a session by clearing auth data, so an agent can infer when to use it. However, it does not explicitly say when to use this tool instead of siblings like librus_profiles or librus_get. It could have named these alternatives and given conditions, but the use case is reasonably clear from the token-based action.

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