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

The addition of 'permanently' usefully indicates the deletion is irreversible, going slightly beyond the destructiveHint annotation. However, it does not disclose behavior such as idempotency, handling of nonexistent bookmark IDs, or any side effects. The annotation already covers the core destructive nature.

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 sentence that earns its place by adding the important 'permanently' qualifier. It is appropriately sized and front-loaded for a one-parameter delete tool.

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 simple destructive tool with a fully documented single parameter and a destructiveHint annotation, the description is nearly complete. The only minor gap is not describing the outcome or behavior when the bookmark does not exist, but this is not essential for invoking the tool correctly.

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 100% and the bookmark_id parameter is already described as 'ID of the bookmark to delete.' The description adds no additional parameter context, which is acceptable given the high schema coverage.

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 specific action and resource—'Delete a bookmark permanently'—and the explicit 'bookmark' target distinguishes it from sibling delete tools for books, notes, tasks, and other entities. It is not a vague or tautological phrasing.

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 explicit when-to-use guidance or comparison with alternatives. The intended use is implied by the verb and resource, but the description does not mention conditions, prerequisites, or situations where another tool would be preferable.

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