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

Far exceeds the annotations (which only flag destructive/openWorld). It discloses the Let's Encrypt 5-per-week limit, the two internal guard checks with their precise limitations (counting only Turbopress-issued certs = a lower bound; freshness check = an indicator, not a count), the force bypass, the explicit non-silent failure when a check cannot run, and the confirmed vs unconfirmed response semantics.

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 core action and its replacement behavior are front-loaded, and the extended guard/limit detail is relevant to correct invocation. It is nonetheless dense and long for a single tool, with some over-explanation of the two checks that could be trimmed.

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, the description carries the return-value burden and does so: it states the live-confirmed result (issuer, covered names, validity) and the explicit unconfirmed alternative. Failure modes and the force escape hatch are all covered.

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 100%, so every parameter (domain, include_www/webmail, include_mail, force) is already documented with defaults in the schema. The description restates the include_mail DNS prerequisite and that force overrides both checks, adding only marginal meaning beyond the schema.

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 ('Stellt ein neues Let's-Encrypt-SSL-Zertifikat für eine Domain aus') and clarifies the side effect ('ersetzt damit das aktuelle Zertifikat'). This cleanly separates it from read-only siblings like get_ssl_status and from set_contact_form/fix_https_redirect.

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?

Gives clear conditions for the risky options: include_mail only 'auf Wunsch' and only when an existing mail.<domain> DNS record is present, and force only 'wenn wirklich nötig'. It does not explicitly route an agent to get_ssl_status first, so it stops short of full when/when-not/alternative guidance.

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