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

Annotations already declare readOnlyHint=false, openWorldHint=true, idempotentHint=false, and destructiveHint=false. The description adds genuinely useful context beyond those: the cards render directly in the reply, no dashboard navigation is needed, and the operation is free with no AI credits. It does not disclose what happens when a user actually approves or dismisses an item, but for a card-rendering tool this is a minor gap.

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 description is compact and front-loaded: purpose, prerequisite, usage trigger, and a clear anti-pattern in four short sentences. It loses a point because 'Render inline Approve/Dismiss cards' and 'the cards appear directly in your reply' are slightly redundant, and the cost note could be tightened, but every sentence still earns its place.

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?

Given the output schema exists and the parameter count is small, the description is largely complete: it covers what the tool does, when to call it, how to get IDs, and what not to do. The main omission is a clearer statement of whether taskIds, campaignIds, neither, or both are required to render a useful result; the schema says 0 required, but the description's 'get ids first' implies at least one should be present.

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 low (33%), but the description compensates by telling the agent to source taskIds and campaignIds from list_seo_tasks / list_seo_campaigns first, which adds real meaning beyond the raw parameter names. It does not restate the maxItems constraints or explicitly discuss optionality, but those are already visible in the schema and the description's 'existing proposals' framing covers the core semantic 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 states a specific verb and resource: 'Render inline Approve/Dismiss cards for EXISTING proposed tasks and campaigns.' It also distinguishes the tool from the dashboard and from list-style tools by requiring IDs from list_seo_tasks/list_seo_campaigns first, so an agent can tell exactly what this tool does.

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 an explicit trigger: 'Call this whenever the user wants to see, review, or act on proposals that already exist.' It also states a clear when-not-to: 'NEVER send the user to the dashboard to approve something,' and names the prerequisite source of IDs. This is concrete, actionable guidance.

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