delete_checkin

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

Annotations already cover destructive (destructiveHint=true) and idempotent (idempotentHint=true) behavior. The description adds the 'active' qualifier, which gives scoping context, but does not clarify that it likely operates on the authenticated user's current check-in, whether it returns a specific response, or what happens when no check-in is active. It adds some value beyond annotations but remains thin.

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 extremely concise: one short sentence plus the HTTP method. Every word earns its place, and the purpose is stated first. There is no fluff or redundant restatement of the tool name.

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?

Despite being a simple tool, the description leaves critical context unaddressed: it does not specify that the check-in is user-scoped, what 'any active checkins' exactly means, or when it should be used (e.g., after stopping playback). The output schema exists, so return details are not required, but the lack of usage context and the ambiguous scope make this description insufficient for reliable agent selection.

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?

This tool has zero parameters and the schema is 100% covered, so the description need not explain any. The baseline for zero-parameter tools is 4, and the description does not mislead or require compensation.

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 clear action ('Delete') on a resource ('checkins') with a scope qualifier ('any active'). However, the word 'any' is ambiguous – it could imply deleting all checkins or the user's current one, which slightly undermines precision. Still, it is distinct from sibling delete tools and pairs naturally with create_checkin.

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 guidance is provided on when to use this tool versus alternatives. It does not mention that this is for ending a user's active check-in, nor does it reference create_checkin or other scrobble/checkin related tools. An agent receives no context about prerequisites, authentication, or typical invocation scenarios.

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