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

Annotations already declare readOnlyHint=false and destructiveHint=false, so the safety profile is covered. The description adds that it returns the new project id and that title is optional, which is useful, but it says nothing about permissions, side effects, or whether the project becomes active/selected after creation.

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 action and the return value. Slight redundancy: 'Optionally set a title' duplicates the schema's own description of the only parameter.

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, stating the return value (the new project id) is the key piece of missing structured information, and the description supplies it. For a one-optional-parameter creation tool this is nearly complete, though it omits any notion of what state the new project starts in.

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 single parameter is already documented as 'Project title (optional)'. The description's 'Optionally set a title' merely restates the schema, adding no format, length, or default-value detail. 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 ('Create') and resource ('FilmLab project'), which cleanly separates it from lab_get_project and lab_list_projects and from the other create_* siblings (character, location, sequence). An agent can identify the target entity without opening the 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?

Usage is implied by the verb — you call this when you need a new project container — but the description names no alternatives, prerequisites, or when-not-to-use conditions (e.g., whether a project must not already exist, or how it relates to lab_create_sequence). Minimum viable guidance.

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