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

Annotations already disclose the write profile (readOnly=false, idempotent=false, destructive=false, openWorld=true), lowering the bar. The description adds two useful facts beyond them: proxied defaults to false, and the record can be reversed via cf_undo. It still omits auth/permission needs and any rate-limit context, so it is solid but not rich.

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 tight sentences, front-loaded with the core action and examples, with no filler. Slightly under-elaborated on routing but nothing wasted.

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?

With no output schema required and annotations carrying the safety profile, the description covers purpose, examples, the proxied default, and the reversal path. The only gap is the lack of differentiation from cf_dns_change, which keeps it from a 5.

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 89%, so the schema already documents all 9 parameters well, including the proxied default. The description only repeats the proxied default and adds no new meaning for type/name/content/data, so the baseline 3 applies.

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 (Add) and resource (DNS record to a Cloudflare zone) and gives concrete examples of what can be added (subdomain, mail record, verification text). It does not differentiate itself from the sibling cf_dns_change, which an agent might confuse with it, so it falls short of a 5.

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?

Usage is implied by the 'Add' framing, and it usefully points to cf_undo for removal, but it never states when to prefer this over cf_dns_change or what prerequisites (e.g. an existing zone) are needed. This is the minimum viable routing guidance.

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