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

Annotations already declare readOnly, idempotent, non-destructive and openWorld, so the safety profile is covered. The description adds genuinely new behavioral context: no auth/tokens are needed and usage carries a licensing/attribution obligation — both beyond what the annotations convey.

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 short sentences, front-loaded with the core capability, then cost/auth, then the licensing caveat. No filler and nothing repeated from the 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?

For a single-item lookup with an output schema (so return shape needn't be explained) and full annotation coverage, this is nearly complete. The one meaningful gap is the provenance of the required pol_id — an agent must infer it comes from search_open_loops.

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 0% and the single required parameter pol_id has no textual explanation of what it identifies or where it comes from. The description only indirectly implies the id refers to a 'released sample', while the format constraint lives in the schema pattern, so it adds marginal semantics.

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?

Specific verb ('Get') plus a precise resource ('a released sample's metadata, exact licence, attribution, preview and WAV download URLs') — an agent immediately knows this is a single-item detail fetch, not a search. It does not name search_open_loops as the sibling it differs from, so sibling differentiation is only implicit.

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?

'Free; no account or tokens required' preempts a real question given the cost/token siblings (estimate_cost, get_token_balance, purchase_token_pack), and the attribution note flags a post-use obligation. However, it never says how to obtain a pol_id or points to search_open_loops as the way to find one, leaving the when-to-use path implied rather than stated.

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