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

Annotations already declare readOnlyHint=true, so the safety profile is covered. The description still adds real behavioral value beyond that: the redaction of passwords, the pagination envelope, and the underlying Civo endpoint. It stops short of stating rate limits or whether pagination is 1-indexed, so it is not a 5.

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 tightly packed sentences plus an endpoint reference; the resource and scope are front-loaded and every clause carries information. It is dense rather than wasteful, though the API endpoint citation is arguably redundant for an agent.

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?

There is no output schema, so the description correctly takes on the burden of describing return contents (software/version, size, nodes, IPs, port, network, firewall, status) and the pagination envelope. It is essentially complete for a read-only list call.

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 region, page and per_page are already fully documented in the schema (including the CIVO_REGION default and limits). The description adds the pagination response shape but little new parameter meaning, so the baseline 3 is correct.

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 (list managed databases), names the engines (MySQL, PostgreSQL), and scopes it to a region. It also enumerates the returned attributes, so an agent can identify it against every sibling list tool (instances, volumes, firewalls) without opening a schema.

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?

The regional scoping is stated ('in a region') and pagination is implied, so the agent knows the context, but there is no explicit when-to-use/when-not guidance or named alternative. Since no sibling tool lists databases, routing risk is low and 3 is adequate.

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