Verify setlist.fm API key + connectivity

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

Annotations already declare readOnlyHint, openWorldHint, and idempotentHint. The description adds genuine value beyond these: the specific endpoint called, the return shape {ok, authenticated, country_count}, and the plain-English hint distinguishing 'no key' vs 'bad key' vs 'API error'. The trailing 'Read-only.' repeats the annotation and adds no new information, but the rest is substantive.

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?

Two tight sentences that front-load the verb and resource, with the return format and failure modes in the second sentence. The only waste is the trailing 'Read-only.', which duplicates the readOnlyHint annotation and could be dropped.

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 zero-parameter tool with no output schema and strong annotations, this description is complete: it covers purpose, the exact mechanism, the return values, failure-mode disambiguation, and safety. Nothing an agent needs to invoke it correctly is missing.

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 tool has zero parameters, so the baseline is 4 and the description has no parameter burden to carry. It appropriately explains the internal mechanism (calling the countries endpoint) without needing to document any inputs.

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 ('Confirm'), a specific resource ('setlist.fm countries endpoint'), and the outcome being verified ('API key is configured and works'). The purpose is unambiguous and clearly distinct from all 21 sibling tools, none of which perform health checks.

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 title 'Verify setlist.fm API key + connectivity' provides clear context for when to use this tool, and the description reinforces that it is a diagnostic/verification tool rather than a data-query tool. However, it never explicitly names alternatives or states exclusion conditions (e.g., 'use before other setlist calls'), leaving the when-to-use guidance implicit rather than stated.

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