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

With only destructiveHint=true in the annotations and no output schema, the description usefully discloses the return path ('Returns the new id as data.new_id'), which the structured fields do not. It still says nothing about permissions, alerting defaults, duplicate checks, or what the destructiveHint implies for an SSL check.

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 purpose, then the return value, then the API mapping. Nothing is padded and every line carries information.

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 12-parameter creation tool with no output schema, the description covers the essential missing piece (the new id location) and the schema covers parameters fully. Auth requirements and failure behavior are the only notable omissions.

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 100%, so all 12 parameters including the required website_url/check_rate/alert_at trio are already documented in the schema. The description adds no parameter-level meaning beyond that, 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 and resource ('Start monitoring a site's SSL certificate') and adds the underlying endpoint 'StatusCake: POST /ssl'. The SSL resource inherently separates it from the uptime/heartbeat create siblings, though it never names an alternative explicitly.

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 resource being monitored (SSL certificate expiry/problems), but there is no statement of when to pick this over statuscake_create_uptime_check or statuscake_create_heartbeat_check, and no prerequisites or exclusions are given.

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