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

Annotations already declare readOnlyHint=false, destructiveHint=false and openWorldHint=false, so the safety profile is partly covered. The description adds only the 'editor-owned' ownership nuance and says nothing about whether the preview data or unsaved changes are discarded, whether the call is idempotent, or what happens if the preview is already gone.

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?

It is a single, front-loaded sentence with no filler, so structure is fine. The brevity, though, comes at the cost of substance rather than being earned economy.

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 mutation tool with two undocumented required identifiers and no output schema, the description leaves out the outcomes and failure modes an agent needs. A caller cannot tell what state the preview ends up in after cancellation.

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% for two required UUID parameters (sessionId, previewId), so the description must compensate and it does not. Worse, the word 'current' implies no identifier is needed at all, which works against the required-parameter reality.

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 verb 'Cancel' and resource 'preview' are present, plus an ownership qualifier ('editor-owned'), so the basic action is inferable. However, 'current' suggests the target is implicit, which conflicts with the schema requiring explicit previewId and sessionId, and nothing distinguishes it from siblings like get_editor_preview or load_editor_preview.

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?

There is no guidance on when to cancel versus simply fetching or reloading a preview, nor any stated prerequisites such as an active editor session. The agent must infer the usage context entirely from the name.

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