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

Annotations already declare readOnlyHint=true and openWorldHint=false, covering the safety profile. The description adds the auth prerequisite ('Requires: token'), which is real behavioral context, but says nothing about result shape, volume, or pagination for what could be a long list.

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?

A single tight sentence followed by a short auth note; the scoping definition is front-loaded and nothing is redundant. The trailing 'Requires: token.' fragment is slightly tacked-on but small.

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?

No output schema exists, yet the description adequately characterizes the returned set (services you have operator access to but do not own). Minor gap: no mention of ordering or whether the list can be paginated, which matters for an unbounded list tool.

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?

Zero parameters, so there is nothing for the description to disambiguate; the baseline of 4 applies. No parameter-level detail is missing or needed.

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?

Specific verb (List) plus resource (services delegated to me) with explicit directionality — 'other owners have delegated operator access to you' — which cleanly separates it from siblings like list_delegations, delegate_service, and list_vps. An agent can pick this tool without opening a schema.

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 clause 'the VPS you can operate but don't own' implies the use case well, but no explicit when/when-not guidance or named alternative (e.g. list_delegations for delegations you granted) is given. Usage is inferable rather than stated.

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