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

Annotations already declare readOnlyHint=false, destructiveHint=true, idempotentHint=true and openWorldHint=false, so the safety and repeat-call profile is covered structurally. The description adds that approval is bound to one exact revision and that the tool is UI-gated, but says nothing about what an approval replaces or whether prior approvals are superseded.

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?

Two short sentences with zero filler; the action and its scope come first and the access restriction second. Nothing needs trimming or reordering.

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 annotations cover safety. Still, for a destructive, idempotent write with four undocumented parameters, the description omits prerequisites, the effect of approval on existing facts, and how to source the four IDs.

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 burden, yet it only gestures at 'revision' (implying an exact-match/optimistic-concurrency value). brandId, factId and especially idempotencyKey are left entirely unexplained in both schema and description.

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 (Approve) and resource (a business fact revision), and the qualifier 'the exact ... revision reviewed in the card' narrows the target beyond a generic fact. It is distinguishable from list_brand_facts and save_brand_fact, though 'the card' is UI jargon an agent may not resolve.

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?

'Only available to the app UI' is an explicit, actionable when-not-to-use constraint that prevents an agent from calling it. However, it names no alternative tool (e.g. save_brand_fact) and does not state the prerequisite that a revision must have been reviewed/saved first.

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