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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so safety is covered structurally. The description adds genuinely new behavioral context by stating "Requires read scope", telling the agent an auth precondition exists before calling. It stops short of saying what happens when that scope is missing, but with an output schema present no return-value explanation is needed.

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, no filler, and the scope constraint is placed before the auth prerequisite. Every clause carries information an agent needs: what is returned, whose data, and what permission is required.

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 zero parameters, full schema coverage, an output schema, and rich annotations, the definition covers nearly everything required to invoke the tool. The only meaningful omission is routing guidance relative to the sibling list_reminders and list_drops tools.

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?

The tool takes zero parameters, so the schema contributes nothing beyond confirming an empty argument object; the baseline of 4 applies. The description correctly adds the implicit scope constraint (connected owner only) that an agent would otherwise have to guess.

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 names a specific verb and resource ("List ... saved follows") and scopes it to the connected owner, which distinguishes it from create_alert/update_alert/delete_alert. The one blemish is terminology drift: the tool is called list_alerts but the description calls them "saved follows", leaving a small ambiguity about whether alerts and follows are the same object.

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?

"List only the connected owner's" implies that no filtering by other users is possible, which is useful usage framing, but it never states when to pick this over the adjacent list tools (list_reminders, list_drops) or that the paired create/update/delete/pause/resume alert tools are the mutating counterparts. Usage is implied rather than directed.

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