game_center_activities_leaderboards_create_to_many_relationship

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

With no annotations, the description carries the full behavioral burden, yet it discloses only that the endpoint is deprecated and points to an OpenAPI schema for the body. It says nothing about permissions, whether this replaces or appends existing leaderboard linkages, side effects, or the response. The deprecation note is honest and valuable, but the mutation semantics are left implicit in the HTTP verb.

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 deprecation warning is correctly front-loaded, but the description then repeats the identical path twice in parenthetical form, which is wasted space, and one of the two payload-bearing sentences is a pure schema pointer. It is short but not efficient.

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 deprecated, mutating relationship tool with no annotations and no output schema, the description should explain what linkages are created and what to use instead. Neither is present, so an agent lacks what it needs to call this safely or to route around it.

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% and both parameters are documented in the schema, so the baseline is 3. The description's reference to components.schemas.GameCenterActivityLeaderboardsLinkagesRequest merely repeats what the body property description already states, adding no new meaning about the JSON:API envelope contents.

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 pairs an HTTP verb and endpoint (POST /v1/gameCenterActivities/{id}/relationships/leaderboards) with a clearly named target, so an agent knows this attaches leaderboards to a Game Center activity. It is specific about resource and scope, though it never distinguishes itself from the _delete_to_many_relationship or _v2_create siblings. The DEPRECATED prefix usefully flags the tool's status.

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 only usage signal is the [DEPRECATED] marker, which tells the agent to avoid it but names no replacement and gives no condition for when the tool is still appropriate. There is no mention of the v2 variant or the delete counterpart that a caller would need to choose between.

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