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

Annotations already disclose the safety profile (readOnlyHint=false, destructiveHint=false, idempotentHint=true, openWorldHint=true), so the bar is lower. The description adds a genuinely useful behavioral fact not in annotations: the per-call cost ($0.10 USDC). It does not describe latency, rate limits, or what a 'brief' should contain.

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?

Front-loaded with the tool's function, then the deliverable, then cost. Mostly tight, though the "15+ yrs media/ad-sales expertise baked in" clause is marketing puffery that consumes space without guiding invocation.

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 generative tool with no output schema and 0% param coverage, the description usefully enumerates the return components, but leaves the required 'brief' input and 'count' undefined. An agent knows roughly what it gets but not how to shape the request.

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% across 3 params. The description compensates partially for 'platform' by naming concrete values (Google/Meta/LinkedIn), but leaves 'brief' (required) and 'count' entirely unexplained. Given the low coverage, it should do more.

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 ("Ad copy generator") and enumerates the deliverable (headlines, descriptions, CTAs, A/B variants) plus target platforms (Google/Meta/LinkedIn). No sibling tool overlaps this space, so differentiation is moot, but the purpose is unmistakable.

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 never says when to use this tool vs. alternatives, nor any precondition for invoking it. It implies a marketing-copy use case but gives no explicit context, exclusions, or routing guidance.

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