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

With no annotations, the description carries the full burden and does well: it discloses irreversibility ('permanently'), the cascading side effect ('unlinked from all transactions'), and the confirmation requirement. It omits permission/auth requirements and error behavior, keeping it out of 5 territory.

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?

Two tight sentences, front-loaded with the destructive nature before the confirmation gate. Every clause earns its place; nothing is redundant.

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 single-parameter delete with no output schema, the description supplies the key facts an agent needs: permanence, unlinking side effect, and the confirmation precondition. Auth requirements and failure modes are the only notable omissions.

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?

Only one parameter (id) and schema description coverage is 100%, with a UUID format and pattern fully documented in the schema. The description's 'by ID' adds no syntax or constraint information beyond that, 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 ('Permanently delete a tag by ID'), and 'permanently' usefully distinguishes it from softer alternatives like archive/update operations in the sibling set. It does not explicitly name a sibling to route against, so it stops short of a 5.

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?

Gives an explicit gating precondition: 'Only call when the user explicitly confirms deletion.' That is clear when-to-use guidance, though it does not contrast with alternatives such as update_tag or archive-style operations, nor describe what to do if confirmation is absent.

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