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

Annotations declare readOnlyHint=false, destructiveHint=false and non-idempotency, and the description adds meaningful context beyond them: it discloses the side effects (channel, review queue inbox, secret API key are provisioned) and the authorization requirements ('projects:write' plus a key that reaches all projects). It stops short of describing what happens on duplicate names or how the API key is surfaced.

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?

It is short and front-loaded, with the creation summary and permission requirement in the first two sentences. The opening line largely restates the tool name/title before the more informative sentence, a small redundancy that keeps it from a 5.

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 creation tool with no output schema and a nested object parameter, the description covers side effects and auth well but never says what is returned — notably whether the newly minted secret API key is included in the response, which an agent needs to know since it is shown only once. That makes it adequate but incomplete.

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 computed schema coverage is 0% at the top level, but the nested request properties do carry their own descriptions, so much of the parameter semantics is already documented in the schema. The description adds real value by explaining the domain/context interplay — supplying either makes the project suggest platform policies — but says nothing about name, brief, or usedByMinors.

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 verb and resource ('Create a project') and goes further to enumerate the artifacts created (a channel, a review queue inbox, a secret API key), which distinguishes the outcome from siblings like projects-duplicate or projects-update. It does not explicitly name a sibling alternative, keeping it below a 5.

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?

It gives a conditional usage cue ('Give a domain or context and the project suggests policies for the platform') and states the required permission, which implies when the tool is appropriate. However, there is no explicit guidance on when to use this versus projects-duplicate or projects-update, and no exclusions or preconditions beyond the permission note.

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