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

Beyond destructiveHint/idempotentHint, the description discloses the auth scope requirement, the dry-run-first safety protocol, what the first call returns (summary + confirm_token), and that unknown fields are rejected by name. That is substantial behavioral context the annotations cannot carry.

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?

Front-loaded with the action and permission, then the two-call protocol in tight sentences with no filler. The clause "it checks the arguments as the change would" is slightly abstract but earns its place by explaining the validation behaviour.

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?

No output schema exists, and the description still tells the agent exactly what each call returns and the sequencing required to complete the deletion safely. For a destructive two-parameter tool, nothing essential 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?

Schema coverage is only 50% (`id` is undocumented), and the description compensates by fully explaining confirm_token's lifecycle: omitted on the first call, echoed from the first response on the second, with the same arguments otherwise. Minor tension: it claims unsupported fields are refused, while the schema sets additionalProperties=true.

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?

"Delete a mix" names a specific verb and resource, and the two-phase confirm flow makes it unmistakable against siblings like update_mix or get_mix. It stops short of explicitly naming those siblings, but the destructive verb alone is differentiating.

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 operational guidance: required scope (`content:write`), a first dry-run call, showing the summary to the person, and only then re-calling with confirm_token. It does not, however, say when to prefer get_mix/update_mix instead or what happens if the target is already gone.

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