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

Annotations already declare readOnlyHint=true, destructiveHint=false, and idempotentHint=false, and the description stays consistent with them. It adds genuinely useful behavioral context absent from annotations: the URL is temporary, a 'durable receipt' accompanies it, and asset_id can recover historical renders. It omits idempotency/expiry specifics, so the added value is moderate.

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 purpose sentence is front-loaded and the kind semantics are packed into one compact clause. There is little waste, though the opening fragment lacks a verb and the ordering (limitation placed last) buries the useful sibling-routing cue.

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 annotations covering safety and no output schema to explain, the description covers the tool's primary behavior and kind semantics. It still omits meaning for project_id/edl_version and any pagination/expiry detail for the returned URL, leaving gaps an agent might need for correct invocation.

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 carries the full parameter burden. It fully explains 'kind' (all three enum values) and 'asset_id' (recovers a historical render), but leaves the required project_id and edl_version undocumented. Half the parameters are covered, which is partial compensation for the schema gap.

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 resource (a temporary render URL) and its core action (watching/downloading). It also distinguishes itself from export_final by stating 'This tool cannot create a final export.' It stops short of explicitly naming render_preview or other siblings, so differentiation is partial rather than complete.

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?

The description gives usable selection criteria for the 'kind' values (preview = draft/approval, preview_check = changed sections, final = completed export) and notes the export limitation. However, it never states the overall condition for choosing this tool over render_preview or get_video_info; usage is implied rather than framed as when/when-not.

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