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

Annotations already declare destructiveHint=true, readOnlyHint=false, idempotentHint=false, so the safety profile is covered. The description adds one genuinely new behavioral fact – that this is a Premium-gated capability – but says nothing about what delete/cancel actions destroy or whether they are recoverable.

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?

Purpose is front-loaded, followed by the action inventory and the help tip in three tight sentences. The action list largely duplicates the enum in the schema, which is mild redundancy, but overall there is little wasted text.

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 12-action multiplexed tool with a nested params object and no output schema, the definition is largely self-sufficient: it names the capabilities, the Premium gate, and the help mechanism for per-action fields. It stops short of per-action guidance, but the help escape hatch covers the biggest hole.

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?

Schema coverage is 80% and the three id parameters are well documented in-schema, but the free-form `params` object (additionalProperties: true) is the real gap. The description compensates by directing the agent to action "help" to discover each action's required fields, adding meaning the schema cannot express.

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 domain (interview practice) and enumerates every operation across setups, questions, and sessions, so the agent knows exactly what the tool covers. It does not, however, explicitly contrast itself with the read-side sibling get_interview_practice, which is the one thing keeping 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?

It gives a concrete navigation aid – "Call with action 'help' for each action's fields" – but never states when to use this tool versus get_interview_practice or when-not to use it. Usage is implied through the action list rather than spelled out as a routing rule.

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