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

Annotations already declare this is a non-read-only, non-destructive, non-idempotent, closed-world write, so the safety profile is covered. The description adds the optional-linking behavior and the ID-resolution workflow, but says nothing about duplicate-name handling, validation failure modes, or whether the new project is returned with an identifier.

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 core action, then optional behavior, then the prerequisite hint. Nothing is redundant with the annotations or bloated.

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 no output schema, the description carries the burden of explaining what a successful call returns — presumably the created project and its ID, which the agent needs for follow-on calls. It also omits any note about error conditions for the required name field. Adequate for a create tool but not complete.

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 nine parameters including defaults (status ACTIVE, currency USD, startDate today) are already documented in the schema. The description only restates customerId and assignedToId in prose and adds the list_customers resolution hint, which is marginal value over the schema.

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?

"Create a new project" gives a specific verb plus resource, which cleanly separates it from siblings like update_project, fetch_project, and delete_project. It stops short of explicitly naming those siblings as alternatives, but the intent is unambiguous.

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 states the optional relationships that can be set at creation time and, crucially, tells the agent to call list_customers to resolve a customer ID first — a concrete prerequisite step. What is missing is any when-not guidance, e.g. that post-creation changes belong in update_project.

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