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

Annotations already declare destructiveHint=true, idempotentHint=true and readOnlyHint=false, so the safety profile is covered. The description adds genuinely new context: optimistic revision checking, dryRun defaulting to preview, caption cascade behavior, and that the saved action is undoable — all beyond what the annotations convey.

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 tight sentences with the destructive action front-loaded and no filler. Minor cost: "Revision checked" is compressed jargon that would need unpacking to be actionable against the expectedRevision parameter.

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?

An output schema exists, so return values need not be described, and dryRun/undo semantics are present. For a destructive, 7-required-parameter tool at 14% schema coverage, though, the description leaves expectedRevision and idempotencyKey — both essential to invoking it successfully — undocumented anywhere.

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 only 14% with 7 required parameters, so the description must compensate and largely does not. It explains dryRun's default-preview behavior and nods at removeAssociatedCaptions ("if requested, their linked captions"), but expectedRevision, idempotencyKey, workspaceId, and itemIds are never clarified — "Revision checked" only gestures at the concurrency contract.

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 ("Remove selected timeline items") plus the optional caption cascade, which is more precise than the name alone. However, it never distinguishes itself from the near-identical sibling delete_timeline_items, so an agent cannot tell which removal tool to pick.

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?

Implies usage context by noting the revision check and that dryRun previews by default, which suggests a safe preview-then-apply workflow. But it gives no explicit when-to-use or when-not-to-use guidance relative to delete_timeline_items, batch_update_timeline_clips, or editor_edit_undo.

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