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

Annotations already declare readOnly, idempotent, non-destructive, and closed-world behavior, so the safety profile is covered. The description adds genuinely new context beyond them: entries can be missing and absence means "unknown" rather than "does not exist," and the result carries no device-scan or execution-quota data.

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 terse clauses, front-loaded, with no filler or repetition. It is telegraphic to the point of being fragmentary, but every clause conveys scope or completeness information.

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?

For a paginated list tool with no output schema and no parameter documentation, the description covers result scope and the important completeness caveat, but omits how pagination works (limit/afterProjectId) and what a returned entry looks like. Adequate, with a clear gap around paging.

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 description coverage is 0%, so the description is required to compensate and it does not: neither limit nor afterProjectId is mentioned, and the cursor-pagination contract implied by afterProjectId is never explained. Parameter names and the UUID pattern/defaults in the schema carry all the meaning, which is the minimum for a low-coverage schema.

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 the resource and its ownership scope ("Account-owned project registry"), and the title supplies the verb ("List registered projects"), so the action is unambiguous. It does not, however, differentiate itself from close siblings such as project_snapshot, project_identity, or project_target_list.

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?

Usage is only implied: an agent can infer this is the enumeration call for account projects, and "No device scan or execution quota" mildly excludes device/inspection use cases. There is no explicit when-to-use statement and no named alternative (e.g., project_target_list for per-project targets), leaving selection largely to inference.

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