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

The destructiveHint=true annotation signals a write/risk, and the description adds the actual consequence beyond the annotation: 'leaving Ember leaves the safe zone'. That is meaningful behavioral context the annotation alone does not convey. It does not explain idempotency or reversibility, keeping it from a 5.

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?

A single dense sentence that front-loads the action and then names the alternative. Nothing is wasted, though the terseness borders on cryptic for readers unfamiliar with the domain vocabulary.

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?

No output schema exists, but the description covers the essential outcome (a one-step move, with the implied risk of leaving the safe zone) for a simple movement tool. The undocumented idempotency_key is the only notable gap.

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 50%; the 'exit' property is documented and the description reinforces that its value is an exit code from observe, which adds real meaning. However, idempotency_key is undocumented in both schema and description, leaving half the surface unexplained.

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?

States a concrete action – a single-step movement through an exit – and explicitly contrasts it with the sibling 'travel', which 'goes further in one call'. An agent can distinguish this from travel without opening either schema, though the terms 'Ember' and 'safe zone' carry unstated domain meaning.

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 phrase 'through an exit from observe' implies the prerequisite flow (call observe first to get an exit code) and 'travel goes further in one call' names the alternative for longer movement. It stops short of an explicit when-not statement, but the routing context is clear.

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