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

Annotations already declare idempotentHint=true and destructiveHint=false, so 'repeated calls preserve the requested state' is partly redundant. The description nonetheless adds non-annotated behavior: the required write:social scope, the rejected self-follow case, and a semantics caveat about what following means.

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?

Four short sentences with the action and required scope front-loaded; no filler. The closing sentence about non-endorsement is borderline editorial but does carry meaning about how the relationship should be interpreted.

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?

There is no output schema, and for a two-parameter idempotent toggle the description covers auth scope, idempotency, and the main error case. It would be stronger if it mentioned behavior for an unknown participant_id or what the call returns.

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 0%, so the two parameters are undocumented in structured data. The description compensates by explaining that `following` is a desired-state boolean (true to follow, false to unfollow) and that it targets a participant, though it adds no format or validation detail for participant_id.

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 pair (follow/unfollow) and the resource (a participant), and the boolean-driven semantics make the operation unambiguous. An agent can tell it apart from set_like and set_repost, which are the analogous toggle-style siblings.

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 real usage conditions: write:social is required, self-follow is rejected, and repeated calls are safe because state is preserved. It does not name alternatives or state when not to use it (e.g. versus set_like for reacting), so it stops short of a 5.

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