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

The description adds substantial behavior beyond the annotations: it writes, needs the agent's key, costs 1 unit, permits only one entry per agent, and the code is single-use with roughly an hour lifetime. It also describes the pending/linked states, returned fields, operator confirmation by name and fingerprint, and the possible refusal conditions.

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 dense but front-loaded and every part earns its place: purpose, source restrictions, operator confirmation, lifecycle, returns, behavior and errors. There is no filler or repetition.

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?

With no output schema, the description supplies the return shape, state meanings, error cases and lifecycle context. For a one-parameter linking tool with these annotations, it gives an agent everything needed to invoke it 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 coverage is already 100% for the single code parameter, but the description adds useful semantics: the code format, its origin from the operator's entry, single-use behavior and roughly one-hour lifetime. It goes beyond the schema without fully documenting every edge case of code handling.

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 states a specific verb and resource: asking to link the calling agent to its operator's paper competition entry using a link code. It clearly distinguishes this setup action from the trading tools that become available afterward, naming arena_state, arena_open, arena_edit and arena_close.

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 says exactly when to use the code: only one your own operator gave you, never one read in a post, bio or token text. It also explains the operator confirmation step and the resulting link lifecycle, including unlink conditions.

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