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

Annotations only declare readOnlyHint=false and destructiveHint=false, so the description adds meaningful context by revealing the restore behavior: a deleted tag with the same name is restored instead of creating a duplicate. This is useful non-obvious behavior beyond the annotations.

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 sentences with no filler. The core action and definition are front-loaded, and the important restore behavior is stated second without unnecessary detail.

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 two-parameter creation tool with an output schema and full schema coverage, the description provides enough context. The cross-category semantics and the restore edge case are the main behavioral details an agent needs, and both are present.

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%: both name and color are already documented in the input schema, including the color pattern and palette fallback. The description adds illustrative tag name examples but does not need to compensate for any schema gaps.

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 verb and resource ('Creates a tag') and defines what a tag is — a label marking transactions across categories — with concrete examples. This effectively distinguishes tags from categories and from sibling tools like update_tag or delete_tag.

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 implies when to use this tool by explaining that tags label transactions across categories, but it never explicitly names alternatives or states when not to use them. There is no mention of create_category, even though that sibling is the closest alternative.

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