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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false, and openWorldHint=false, so safety is covered. The description adds two things beyond them: that access is anonymous (no credentials needed) and free. It does not describe the shape of the returned entries, and 'with requirements' is only a hint about the payload.

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?

One short, front-loaded sentence with no filler: the scope ('every directory'), the qualifier ('with requirements'), and the access properties ('free, anonymous, read-only') all appear immediately.

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 parameters, no output schema, and rich annotations, the description covers what an agent needs to decide to call it. The minor gap is the absence of any hint about the returned record shape, which matters here because there is no output schema to fall back on.

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 there is nothing for the description to disambiguate; baseline for a parameterless schema is 4. The single sentence does not introduce misleading parameter expectations.

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 action and resource: listing every directory the service can publish the server into, plus the notion of 'requirements'. It is clear on its own, but it never contrasts with the sibling list_directories, so an agent must infer how 'destinations' differs from plain 'directories'.

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?

'Free, anonymous, read-only' gives useful preconditions (no auth, no cost) and implies the tool is for browsing before submission. However, there is no explicit when-to-use versus when-not, and no routing to related siblings such as list_directories or check_launch_coverage.

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