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

The non-idempotency warning ("Each call creates a new record") is real behavioral context beyond annotations and directly prevents accidental duplicate creation. The endpoint disclosure is also useful. It stops short of saying what is returned or what permissions/validation failures look like, so it is 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 clauses, front-loaded with the WRITE marker and the core verb+resource, then the idempotency caveat, then the endpoint. No filler and nothing that needs reordering.

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 3-parameter create tool with no output schema and full schema coverage, this covers the essentials an agent needs: it's a write, it's non-idempotent, and the customer must pre-exist. Only a note on error/return behavior would add anything.

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% and the required fields, minLength, and the cross-reference to craftboxx_list_customers are all already in the schema. The description adds no parameter-level meaning, 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 ("create a new project") plus a scope qualifier ("for an existing customer") and even the underlying endpoint (POST /projects). This clearly separates it from craftboxx_get_project and craftboxx_list_projects without opening a 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?

"For an existing customer" implies the prerequisite that the customer must already exist, and the schema points at craftboxx_list_customers for the id. However, the description gives no explicit when-to-use/when-not guidance and never names a sibling alternative, so usage is inferable rather than stated.

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