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

With no annotations provided, the description carries the full burden of behavioral disclosure. It mentions returning a session URL but does not disclose potential side effects, resource consumption, session lifecycles, or the need to close sessions later. This is a meaningful gap for a resource-creating tool.

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 a single, front-loaded sentence with no filler. It conveys the action, target, and result efficiently, earning a top score for conciseness without sacrificing key information.

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?

While the schema covers parameters, the description lacks important session lifecycle context: it does not mention that sessions should be closed with 'close_session', that they can be interacted with via 'push_session_action', or what 'interactive session' entails relative to the sibling tools. This leaves the agent without a complete operational picture.

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 input schema provides descriptions for both parameters ('Calculator slug' and 'Optional session metadata'), and schema coverage is 100%. The description adds little beyond 'any calculator', so the baseline of 3 is appropriate; the schema handles the parameter semantics adequately.

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 ('Create') and resource ('interactive session') and clearly states the output (session URL). It distinguishes from siblings like 'calculate' (one-off calculations) and 'close_session' (destructive), making the purpose unmistakable.

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 does not explain when to choose this tool over alternatives, such as 'calculate' (which might not require a session) or how sessions relate to 'push_session_action' and 'close_session'. No contextual guidance or alternatives are mentioned, leaving the agent to infer usage from the tool name.

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