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

Annotations already declare readOnlyHint=false, destructiveHint=false and idempotentHint=false, so the mutation/non-idempotent profile is covered. The description adds genuinely new behavioral context: the required role and the plan-limit failure mode with its returned message. It stops short of a 5 by not saying what a successful call returns or whether duplicate names are allowed.

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 with no filler: purpose first, then the authorization prerequisite, then the quota failure mode. Every sentence carries an actionable fact an agent would otherwise have to discover at runtime.

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 two-parameter creation tool with no output schema, the description covers the essentials an agent needs to attempt the call safely: scope, role requirement, and quota error behavior. It is only slightly short of complete because the return value (e.g., the new project identifier) is undocumented.

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 both `name` and the optional `description` are already documented in the schema. The description adds no format, length, or uniqueness constraints on the name, so the baseline 3 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?

States a specific verb and resource ("Create a project") plus the scope ("in the active workspace"), which is enough for an agent to distinguish it from delete_project or update_project. It doesn't explicitly contrast with the closest sibling create_project_from_template, so it stops short of 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?

The description gives a strong precondition (Administrator or ProjectManager role) and a hard constraint (free-plan cap of 3 projects), which informs when the call will succeed. However, it never names alternatives such as create_project_from_template or explains when to prefer a template-based creation, so usage routing is only implied.

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