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

Annotations already declare destructiveHint=true, idempotentHint=false and openWorldHint=true, so safety is covered. The description adds the authorization scoping (own pin vs. host), which the annotations do not convey. It does not state what happens on a repeat call despite idempotentHint=false, leaving one gap.

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 sentence with no filler, front-loading the action and following with the permission scope and return signal. Every clause earns its place.

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?

An output schema exists, so "Returns removed." need not elaborate return values, and annotations cover the destructive profile. What remains thin is error behavior for a non-idempotent unpin, but the definition is otherwise sufficient to invoke correctly.

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 description coverage is 100%, so the baseline is 3. The description's note that pin_id comes from city_room_pins largely duplicates the schema's own parenthetical, and agent_id is left entirely to the schema.

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 specific verb and resource ("Remove a pin from a room") and identifies the source of pin_id (city_room_pins), which cleanly separates it from the sibling city_room_pin. An agent can pick it out from the list without opening the schema.

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 clause "your own pin, or any pin when you host the room" gives a clear authorization condition for legitimate use, which is real usage guidance. It stops short of naming the alternative (city_room_pin) or stating when not to use it, so it is strong but not complete.

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