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

With no annotations, the description carries the full disclosure burden, but it only states the operation and mechanism. It does not explain side effects (e.g., which preferences or lists are updated), idempotency, success or failure semantics, or authentication requirements.

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 a single front-loaded sentence with no filler, making it structurally efficient. However, the brevity sacrifices behavioral and usage detail, which prevents it from earning the top score.

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?

The tool has no output schema and no annotations, yet the description omits return behavior, effect scope, and prerequisite token origin. For a one-click unsubscribe action, an agent needs at least basic outcome and side-effect information, all of which are 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 schema already fully documents the token parameter with 'Signed preference token', so the baseline is 3. The description adds a slight conceptual link between the token and the 'signed capability' but no additional syntax, source, or validation details.

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 phrase 'Apply one-click unsubscribe' names a specific action and resource, and the signed-capability mechanism distinguishes it from sibling tools like commsharbor_preference_get and commsharbor_preference_token_create. The purpose is immediately clear without needing to inspect the schema.

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 provides no guidance on when to use this tool versus alternatives such as commsharbor_preference_token_create or commsharbor_suppression_create. The only implicit context is that a signed token/capability must already exist, but there is no explicit conditional or exclusion.

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