apply_domain_dns

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

With no annotations at all, the description carries the full burden. It usefully discloses that credentials can come from the dashboard or be supplied per-request, which is real behavioral context beyond the schema. But for a tool that writes live DNS records it says nothing about whether existing records are overwritten, what happens on partial failure, or what auth level is required.

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 with no filler, and the core action is front-loaded ahead of the credential nuance. Nothing is redundant, though it is arguably too terse for a live-DNS mutation.

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 no annotations and no output schema, the description covers the action and credential model but omits vercel handling, overwrite/idempotency semantics, and any indication of what the caller gets back. Adequate as a minimum-viable definition, incomplete for the risk profile.

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 coverage is only 33%, so the description has to compensate. It clarifies credential sourcing for Cloudflare and GoDaddy, adding meaning beyond the schema's brief 'GoDaddy api key/secret' note. However, the provider enum includes 'vercel' and the description never mentions vercel, leaving that accepted value and its credential handling unexplained.

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 ('Apply Groundmail DNS records for a domain'), so an agent knows this writes DNS records rather than just creating or verifying a domain record. It does not explicitly differentiate itself from the close siblings create_domain and verify_domain, but the action is unambiguous.

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?

It gives conditional credential guidance per provider (Cloudflare/GoDaddy can use dashboard-stored credentials, GoDaddy also accepts one-time credentials), which is implied usage context. However, it never says when to call this versus create_domain or verify_domain, nor what prerequisites (domain must exist, be verified) apply.

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