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

The 'Read-only' note merely restates the readOnlyHint=true annotation, so it adds no new safety information. It does add useful context that each entry carries a package version id, version and capability, but says nothing about pagination behavior beyond what the schema already documents.

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?

Front-loaded with the core action and scope, then the routing hints, then the terse 'Read-only.' The CLI-twin parenthetical is arguably noise, but the whole thing stays tight and earns most of its length.

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 lists what each package entry contains (version id, version, capability) and points to the follow-up tools, covering the main gaps for a paginated catalogue list. Only pagination specifics are left entirely to the schema, which is acceptable.

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% (after/limit are fully documented in the schema), so the description needn't explain them. It mentions package_version_id, but that is a returned field rather than an input, leaving the baseline 3 appropriate.

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+resource ('List the managed-service packages this organisation may set up'), enumerates concrete catalogue members (PostgreSQL, Valkey, OpenSearch, etc.), and clarifies it is a catalogue rather than instances, distinguishing it from siblings like list_service_instances and get_service_package.

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?

Explicitly routes the agent onward: pass a package_version_id to get_service_package for parameters/modes, or to prepare_service_setup to set one up. This is strong downstream guidance, though it does not state when to prefer this list tool over the sibling catalogue/discovery tools.

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