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

Annotations already declare the safety profile (readOnlyHint=false, destructiveHint=false, idempotentHint=false, openWorldHint=false), so the bar is lower. The description adds real value beyond them by disclosing the return payload ("the id and the link the user opens so you can edit it") and clarifying that the project starts empty.

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 the format options, then the return value. No filler and no repetition of the schema.

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 four-parameter creation tool with no output schema, the description usefully covers the format-vs-dimensions choice and the return values. It is slightly incomplete in leaving `name` undocumented and not stating whether width/height and format can be combined.

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 0%, so the description must carry the parameter burden. It does add meaning for format by mapping each enum value to platforms (YouTube, TikTok, Reels, Shorts) and explains the width/height alternative, but the `name` parameter is never mentioned and no defaults or mutual exclusivity between format and width/height is stated.

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?

The description opens with a specific verb+resource ("Start an empty project"), and the word "empty" distinguishes it from mutation siblings like edit_project and read siblings like get_project. It stops short of naming an alternative tool explicitly, so it is clear but not fully sibling-differentiated.

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 only implied: an agent can infer this is the entry point for creating a new project rather than opening an existing one, but there is no explicit when-to-use guidance, no prerequisites, and no named alternative (e.g., find_templates or connect_editor) for adjacent workflows.

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