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

Annotations already cover the read-only, open-world, non-destructive profile, and the description adds real context on top: the authorization scope is the token's user, the endpoint is GET /projects, and location tools additionally require a Business-plan project. It doesn't discuss result size or error behavior for unauthorized projects, so not a 5.

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 what is listed and what is returned, then the routing instruction and the plan caveat. No filler or restated name.

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 zero-parameter read tool with no output schema, the description covers input (none), output fields, the authorization scope, the endpoint, and the downstream constraint on sibling calls. Nothing an agent needs before invoking or chaining it is missing.

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 tool takes zero parameters, so the baseline is 4; the description correctly implies no inputs are needed and instead spends its words on what the returned id is used for, which is the semantically useful part for a no-arg tool.

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 ('List the StoreRocket projects (store locators)') and scopes it to 'the token's user belongs to', then enumerates the returned fields (public id, name, location count, status, plan). An agent can distinguish it from the location siblings without opening any schema.

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 explicit downstream usage ('Use the id as project_id in every location tool') and a prerequisite ('Location tools need a project on the Business plan (API access)'), which tells the agent both why and when to call this first. It stops short of naming when-not-to-use cases, so it lands just below the top mark.

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