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

Annotations only declare readOnlyHint=true; the description goes further by warning that responses 'can include connection URIs with credentials', which is genuinely valuable sensitive-data disclosure for an agent handling the output. It also itemizes the returned fields (state, component hosts/ports, backups, labels), though it does not discuss pagination defaults beyond what the schema already states.

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 compact sentences, front-loaded with the resource and engines, then return fields, then the credentials caveat. Every sentence carries information; the field enumeration is long but directly useful given there is no output 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?

With no output schema, the description usefully compensates by listing the returned fields and flagging credential-bearing URIs, covering the security-relevant behavior an agent needs. Remaining gaps (pagination behavior, tenancy scoping) are minor and partly covered by the schema.

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 label, limit, and offset are fully documented in the schema (filtering semantics, 0-100 range, API default 10). The description adds nothing about parameters, 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 clear verb+resource (list Managed Database services) and enumerates the returned fields, plus names the concrete engines (PostgreSQL, MySQL, Valkey, OpenSearch), so an agent knows exactly what this returns. It does not explicitly differentiate from sibling list tools, but no sibling targets the same resource, so the gap is minor.

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 description never says when to use this tool versus alternatives, nor mentions prerequisites, tenancy scoping, or any exclusion. Usage is only implied by the phrase 'managed database services'. Sibling list tools exist but no routing guidance is offered.

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