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

Annotations already declare readOnlyHint=false, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description does add one behavioral fact beyond that — the action is reversible ('or not done again'), i.e. it can be un-ticked — but says nothing about permissions, label-vs-artist connection requirements, or what the response confirms.

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?

A single front-loaded sentence that identifies the action immediately and wastes no words. The trailing 'the tick in Audora' is slightly vague phrasing but does not undermine the concision.

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 two-state mutation with no output schema, the definition is minimally adequate: the schema carries the parameter and connection details, and the description confirms reversibility. It is missing the distinction from close_todo and any confirmation of state return, which leaves a real gap for an agent choosing among the todo-mutating siblings.

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 75%, so the schema already explains todo_id, artist (label connection rule), and idempotency_key. The description adds no parameter meaning beyond that and does not itself explain the done toggle's semantics, so the baseline 3 applies.

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 and resource ('mark one checklist item done, or not done again') and clarifies it is a toggle in both directions. However, it never distinguishes itself from the sibling close_todo or explains how ticking relates to closing, so an agent can't route between them from the description alone.

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?

There is no when-to-use guidance, no prerequisites, and no mention of alternatives such as close_todo or list_release_todos. Usage is only implied by the verb 'mark done'.

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