Guest Login

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

The description adds valuable behavioral context beyond annotations: it specifies 'limited permissions' (which annotations don't cover) and 'No credentials required' (clarifying authentication requirements). Annotations already indicate it's non-destructive and non-idempotent, but the description provides practical usage context without contradicting them.

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 perfectly concise with two short sentences that each earn their place: the first states the core purpose, the second adds crucial behavioral context. There's zero wasted language and the most important information is front-loaded.

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 single-parameter tool with good annotations but no output schema, the description provides adequate context about what the tool does and its authentication requirements. However, it doesn't describe what the guest session enables or what 'limited permissions' specifically means, leaving some behavioral aspects undefined.

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?

With 100% schema description coverage, the input schema already fully documents the single optional 'nickname' parameter. The description doesn't add any parameter-specific information beyond what's in the schema, so it meets the baseline expectation without exceeding it.

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 clearly states the specific action ('Create a guest session') and resource ('guest session'), with explicit mention of 'limited permissions' that distinguishes it from other login/authentication tools like 'dual_login' or 'dual_register'. It provides a complete purpose statement in a single sentence.

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 provides clear context about when to use this tool ('No credentials required'), which implicitly suggests it's for unauthenticated access scenarios. However, it doesn't explicitly mention when NOT to use it or name specific alternatives like 'dual_login' for regular authentication, which prevents a perfect score.

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