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

Annotations already declare idempotentHint=true, destructiveHint=true and readOnlyHint=false. The description adds concrete semantics beyond them: omitted fields retain their values, identical values are no-ops, and the updated record is returned. It omits any note that overwriting an existing value is irreversible, which is the one gap given destructiveHint=true.

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 sentences, front-loaded with the trigger, then the update semantics, then the exclusion. No filler and every sentence carries distinct information.

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 an output schema present, the description need not explain return values, and annotations cover the safety profile. Combined with 100% schema coverage, the definition is nearly sufficient; only the video-vs-tutorial sibling boundary and overwrite irreversibility are unaddressed.

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 100%, so the schema fully documents all 12 fields with types, ranges and formats. The description's field list (language, device, dimensions, links, subtitles, chapters, thumbnail) roughly mirrors the schema and adds no syntax beyond it; format, duration and fileSize are not even mentioned. Baseline 3 is appropriate.

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 names a specific verb ('correct'/'fix') and resource (a tutorial video) and enumerates the editable facets: language, device, dimensions, file link, subtitles, chapters, thumbnail. That is far more specific than a restatement of the title. It does not, however, explicitly distinguish itself from the sibling update_tutorial, leaving mild ambiguity about the video-vs-tutorial boundary.

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 gives an explicit trigger ('Use this when someone wants to correct...') and an explicit exclusion ('Not for re-rendering the video itself'). It stops short of naming a sibling alternative to redirect to, so the routing guidance is clear but not complete.

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