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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds that the returned content is instructional, example-driven, and includes craft guidance on timing and look, but says nothing about length, format, or whether the payload is large enough to warrant budgeting context.

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?

Two sentences, front-loaded with the purpose and ending with the actionable trigger. The parenthetical block-type list is dense but earns its place by telling the agent what topics are covered; minor trimming could still tighten the first sentence.

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 and no parameters, the description carries the burden of explaining what comes back, and it does so by enumerating the guide's topics. An agent knows what it will learn and when to call it; only the shape/size of the returned text remains unspecified.

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 there is nothing for the description to disambiguate; baseline 4 applies. The description correctly implies the call takes no arguments and returns a fixed guide.

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 gives a specific verb and resource ('Read the video guide') and scopes the content precisely: 'How to build a project's picture and sound with edit_project' covering block shapes, animation, canvas, style, font and variables. It clearly ties the guide to edit_project, but does not explicitly contrast itself with sibling read tools such as read_project.

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 a clear trigger: 'Read it before your first add_block or add_animation,' which names the downstream tools and the correct ordering. It does not say when the guide is unnecessary (e.g., after the agent has already internalized it) or name an alternative reference, so it stops short of full when/when-not guidance.

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