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

The annotation readOnlyHint=true already covers the read-only nature, so the description only adds 'live agent-ready' and the fact that it returns a list. It does not disclose additional behaviors like ordering, pagination, or data volume, but given the simple tool and existing annotation, this is acceptable.

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?

The description is very short, but the opening fragment 'Free discovery' is vague and adds little value. The main sentence is clear and front-loaded, making it mostly concise with one minor piece of unnecessary phrasing.

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 no-parameter, read-only tool with no output schema, the description states its primary return value. It lacks guidance on how the returned list might be used or how to proceed to related tools, but the tool's simplicity keeps the description reasonably complete.

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?

With zero parameters, the schema coverage is trivially 100% and the description has no need to explain parameter semantics. The baseline for zero-parameter tools is 4, and the description appropriately omits any parameter details.

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 clearly states 'Returns the list of live agent-ready data packs available on DaedalMap' with a specific verb and resource. It distinguishes itself from sibling tools like get_pack, which retrieves a specific pack, by focusing on the overall catalog.

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?

No explicit when-to-use or alternative guidance is provided. 'Free discovery' hints at an exploratory purpose, but the description does not mention how this tool relates to get_pack or other siblings, leaving the agent to infer the appropriate context.

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