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

Annotations already declare readOnly and idempotent hints, so the description adds value by detailing the ordering (in-use first, then archived) and the virtual Default project for trackers without a project. It also describes the fields returned (id, name, canon_version, archived flag, tracker count), which goes beyond the annotations.

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?

The description is concise, using two sentences to convey the purpose, return fields, and ordering. It is informative yet not overly verbose, though the second sentence packs several details into one sentence. It is well-structured and front-loaded with the key purpose.

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 output schema, the description adequately describes the return structure (fields and ordering) and even mentions the Default project special case. For a simple read-only list with no parameters, everything an agent needs to use it correctly is present.

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?

There are no parameters, so the schema is complete at 100% coverage. The description correctly focuses on the operation rather than parameters, and with zero parameters there is nothing to explain. The baseline of 4 for 0 params is appropriate.

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 clearly states it lists account projects and defines what a project is (folders for trackers). It explains the purpose and even clarifies the organization-only nature, distinguishing it from other list tools by focusing on projects specifically. The verb and resource are clear.

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 description does not explicitly state when to use this tool versus alternatives like list_trackers or list_surfaces. It implies usage by naming the resource, but there is no direct comparison or exclusion provided. The context is clear but the guidance is only implicit.

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