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

Annotations already declare readOnlyHint=false, destructiveHint=true, idempotentHint=false, and openWorldHint=false. The description adds value beyond them by noting that 'Each call creates another project' (duplicate accumulation) and by enumerating the returned fields, though it does not explain the surprising destructiveHint=true for a create operation or any auth/permission requirements.

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?

Three short sentences, front-loaded with the trigger condition, then the return values, then the exclusion. The return-value enumeration is slightly redundant given an output schema exists, but nothing is padded or 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?

With a rich annotation set, 100% schema coverage, and an output schema, the description need not explain return values or safety. It supplies the trigger, the exclusion, and the duplicate-creation behavior, leaving only minor gaps like the reason for the destructive flag and any permission requirements.

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 all three parameters (name, domain, defaultLocale) are already documented in the schema with lengths and examples. The description adds no parameter-level detail such as format rules or how domain/defaultLocale defaults are applied, so the baseline 3 applies.

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 ('start a new Tutorializer project for a product or app') and explicitly carves out the update case ('Not for changing an existing project'). It differentiates from update_project but does not distinguish itself from the other create_* siblings (create_tutorial, create_video), which the agent must infer from the resource noun.

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 a clear trigger ('when someone wants to start a new Tutorializer project') and an explicit exclusion ('Not for changing an existing project'), which routes the agent to update_project. It stops short of naming that alternative or stating prerequisites such as required fields, so it is strong context without full when/when-not coverage.

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