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

Annotations already declare non-read-only, non-destructive, non-idempotent, closed-world, so the safety profile is covered. The description adds real value beyond that: a per-call cost of $0.001 with no charge on failure, and the one-page-per-account upsert behavior that explains why idempotentHint is false. It does not say whether the page goes live immediately or needs publishing.

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 dense clauses ordered purpose → cardinality/update → cost, with zero filler. The reference-product analogy substitutes efficiently for a paragraph of formatting detail.

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 two-optional-param setup tool with annotations and no output schema, this covers cost, visibility scope ('public monitor'), content, cardinality and update behavior. The remaining gap is the provenance of the URL slug referenced as <name>, which no parameter supplies.

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 0%, so the description must carry the parameter burden; it does identify title and description as the mutable fields, implying both are optional. However it never explains what title means versus the page slug — the URL is described as cncto.co/s/<name> while no 'name' parameter exists in the schema, leaving an unexplained identifier.

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 concretely defines the artifact produced: a public page at cncto.co/s/<name> listing every public monitor with current status, 90-day uptime and incidents, anchored by comparison to Atlassian/Instatus. The action verb is only implied by the tool name ('setup'), but the outcome is unambiguous and clearly distinct from uptime_add_monitor/uptime_list_monitors.

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?

'One per account; call again to change its title or description' tells the agent both the cardinality constraint and the update path, which is the key usage decision for this tool. It stops short of naming alternatives (e.g. uptime_update_monitor) or saying explicitly when not to call it, so it is clear context rather than a full routing rule.

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