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

Annotations already declare readOnlyHint=true, openWorldHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds behavior details beyond annotations: returns child nodes (type=l) or table descriptors (type=t), sources data from px.hagstofa.is (PXWeb API), and confirms no auth required. These are useful behaviors not implied by the annotations.

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 dense but every sentence serves a purpose: it defines the resource, enumerates top-level categories, explains node types, gives usage instructions, and references the downstream tool. It is front-loaded with the core action and ends with data source and authentication info. No filler words.

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?

Given the tool's low complexity (one optional parameter), the presence of an output schema, and rich annotations, the description is fully sufficient. It tells the agent how to start, how to traverse, when to stop, and what to do next, which is exactly the workflow an agent needs to interact with this catalog successfully.

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?

The schema already provides a 100% description coverage for the single `path` parameter, including its default and top-level names. The description goes further by explaining the navigation strategy and the meaning of empty path, which complements the schema without redundancy. This adds practical value beyond the schema.

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 states a specific verb ('Browse') and resource ('Statistics Iceland's statistics database tree by path'), lists the top-level databases, and distinguishes itself from the sibling table_metadata tool by explaining when it is used. An agent can immediately understand the tool's scope and differentiate it from other reference tools.

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 gives explicit usage instructions: use empty path '' for top-level databases, navigate hierarchically until type=t nodes, and then switch to iceland-statistics.table_metadata. This names the alternative tool and the condition to switch, leaving no ambiguity about when to use this tool vs siblings.

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