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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile of the non-saving behavior is covered. The description adds the diagnostic categories it reports (overflow, truncated anchors, invalid fades, crop warnings), which is useful, but says nothing about validation result structure, error behavior, or whether a failed validation blocks later apply. The BETA tier/export quota passage is account marketing rather than behavior of this call.

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?

The first sentence is well front-loaded and dense. The BETA date plus free/trial/subscriber export quota sentence is irrelevant to validating an edit and consumes roughly a third of the text, diluting the signal an agent needs.

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 4-required-parameter tool with no output schema and 25% schema coverage, the description should explain the revision/idempotency contract and what a validation response means for the next step. It covers the intent but leaves the mechanical contract underspecified while spending space on account tier limits.

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 coverage is only 25%, so the description's listing of projectId, expectedRevision, idempotencyKey and operations[] is doing real work, and it adds 'typed edit batch'. However, it never explains what expectedRevision means (optimistic concurrency / conflict detection) or why idempotencyKey is required on a non-mutating call, which are exactly the non-obvious parameters an agent would get wrong.

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 ('validate a typed edit batch without saving') and the 'without saving' clause implicitly separates it from video_edit_apply. It stops short of naming video_edit_apply outright, so the sibling routing is inferential rather than explicit.

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?

Gives a clear prerequisite ('Call video_guide first for the catalog, the exact input schema of each action and this account's tier notes') and the 'without saving' framing tells the agent this is the dry-run before applying. It never explicitly says 'use this before video_edit_apply and skip it otherwise', so the exclusion case is left implicit.

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