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

Beyond the annotations (readOnlyHint false, openWorld true, idempotent false), the description discloses practical behavior: DNS propagation delay, the authentication path (token argument or Authorization: Bearer header on HTTP /mcp), and a safety caveat not to publish credentials. It does not say what the response looks like or what a failed confirmation returns, but the added context is genuine.

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?

Three short sentences, front-loaded with the action and its prerequisite, with the safety caveat last. Terse and mostly waste-free, though the URL/DNS phrasing adds ambiguity relative to the two-parameter schema.

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 state-changing confirmation tool with no output schema, the description covers prerequisites, auth, and propagation timing, but omits what success or failure looks like and what the required slug identifies. Adequate but with visible gaps.

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 must carry parameter meaning. It explains the token (pass as argument or via Bearer header), but leaves the required slug completely undefined, and references a 'supplied file URL or DNS TXT name' that is not actually a parameter in the schema, which could mislead an agent about what to pass.

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: confirm domain proof, with the prerequisite that the exact verification token must already be published at a file URL or DNS TXT name. It is clear enough for an agent to recognize this as the verification-completion step, though it does not explicitly contrast itself with siblings like verify_app or submit_mcp_server.

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 says when to use it (after publishing the exact verification token) and warns that DNS propagation may take time, which implies retry behavior. It lacks explicit when-not-to-use guidance and does not name an alternative tool, keeping it short of a 5.

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