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

Annotations already declare readOnly/idempotent/non-destructive, and the description is consistent with them while adding real behavioral context: the tool only produces a URL, and the actual platform sign-in must be performed by the user. The parenthetical that the link "starts the platform sign-in straight away where it can" signals platform-dependent behavior not captured by any structured field.

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?

Three sentences, front-loaded with the purpose before the mechanics and return contents. The clause "it starts the platform sign-in straight away where it can" is slightly tangled but carries non-trivial information, so little is wasted.

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 two-parameter hand-off tool with an output schema and full annotations, the description covers who can execute it, what it produces, and the flow step. The one real gap is input-side: nothing here helps an agent pick the correct platform or decide when to supply brand.

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?

With only 50% schema description coverage, the description needs to compensate, but it never explains the platform enum options or the brand parameter. Its only mention of a platform is in the context of returned data, not the input, so it adds no meaning beyond 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 states a specific outcome — producing a link that lets the person connect a social account to a brand — and is clearly distinct in intent from post/media tools. It doesn't need to differentiate from a sibling since none of the listed siblings do account connection, but it also does not explicitly position itself against any alternative.

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?

"Connecting needs them to sign in to the platform, so only they can do it" is a clear usage constraint that tells the agent this is a human hand-off rather than an operation the agent completes itself. It gives no named alternatives, but there is no competing tool to route to.

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