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

With no annotations, the description carries the full burden. It usefully discloses the authentication model (X-API-Key header or api_key argument fallback). It says nothing about what happens on duplicate names, permission requirements for the team, failure modes, or what the response contains.

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 sentences, front-loaded with the action and the auth requirement, no filler. Slightly terse on the creation semantics, but nothing is wasted.

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 mutation tool with no annotations and no output schema, the auth detail is the key addition, but an agent still lacks return-value expectations (does it yield a project id?) and error/duplicate behavior. Adequate but not complete.

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 100%, so every parameter is already documented in the schema. The description's only parameter-relevant content, the api_key fallback, duplicates the schema's own description. Baseline 3 is correct; no meaning is added beyond the 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?

States a specific verb and resource: 'Creates a project for a team user.' The scope ('for a team user') narrows it beyond the bare name. It does not explicitly distinguish itself from create_account or create-code-vault, but the resource is unambiguous.

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?

Gives one conditional usage rule (pass api_key when headers aren't supported), which is genuinely actionable. However, it offers no guidance on when to use this tool versus create-code-vault/other creation siblings, and no prerequisites or exclusions beyond the auth note.

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