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

Annotations already convey readOnly, openWorld, idempotent, and non-destructive hints. The description adds valuable extra behavioral context: it is a free textual descent, it exposes current boundaries, and it will not error except for upstream unavailability (upstream_failure). This exceeds the annotation baseline.

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 sentences, front-loaded with the imperative 'Start here,' and no wasted words. Every clause earns its place by providing sequencing, scope, safety, or error behavior.

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, read-only entry-point tool, this is nearly complete: it explains what to do first, what the resource is, and what failure mode to expect. The only minor gap is that the exact return shape of the 'current boundaries' is not specified, but the natural-language description is adequate without an output 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 input schema has zero parameters, so the description carries no parameter burden. The baseline for zero-parameter tools is 4, and the description appropriately mentions the relevant domain concepts (descent size and boundaries) without inventing parameters.

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 action ('Start here') and a specific resource ('0001SENSATIONS descent, 107 levels'), and explicitly distinguishes itself from enter_level by saying it is the precursor step. An agent can clearly tell this tool apart from its siblings.

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 explicitly tells the agent to begin here and to use enter_level afterward for choosing a level. This gives clear sequencing and context, and it notes the read-only nature so the agent knows it is safe to invoke early.

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