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

Annotations already declare that this is a non-read-only, non-destructive, closed-world operation, so the bar is lower. The description adds the real behavioral prerequisite (user must enable Remote Control and read a code off the player UI), but it says nothing about what happens after linking, whether the link persists, or how an invalid/expired code behaves.

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 short sentences, front-loaded with the action and followed by the prerequisite. No filler, no redundancy with the schema or annotations.

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 one-parameter linking tool with annotations and no output schema, the description covers purpose, the code's origin, and the user-side setup. Only post-call expectations (success/failure handling, whether the link is durable) are left implicit, which is a minor gap at this complexity.

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 0%, so the description must carry the param meaning, and it does: the single 'code' argument is a 6-character code displayed by the player once Remote Control is enabled. That tells the agent the value must come from the user rather than be constructed, which goes beyond the pattern constraint in 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?

The description gives a specific verb and resource: 'Connect this chat to an Ania Player running on the user's computer.' An agent can distinguish this from status/opening siblings by the local-machine linking framing. It stops short of naming any sibling or stating explicitly what it is not.

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 supplies the concrete precondition for use: the user enables Remote Control in the player, which surfaces a 6-character code. That is clear activation context, but there are no exclusions or pointers to alternatives such as player_status or open_in_player when a link already exists.

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