add_tag

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

Annotations already indicate idempotentHint=true, and the description reinforces this by stating that adding the same tag twice is a no-op. This adds behavioral context beyond the annotations. No other behavioral traits (e.g., authorization needs) are disclosed, but the key trait is covered.

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 extremely concise at three short sentences. Every sentence adds value: purpose, tag nature, and idempotency. No unnecessary words.

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?

Given the simple parameter set (2 params, fully described in schema), presence of output schema, and annotations, the description covers the essential behavior. It could optionally mention case-sensitivity explicitly, but the schema already notes it.

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 description coverage is 100%, so the schema already describes both parameters. The description adds that tags are free-form strings and that adding duplicates is a no-op, which provides minor additional context but does not significantly enhance the schema's meaning.

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 clearly states the action (add a tag/label) and the resource (package), with a purpose (categorization and filtering). However, it does not distinguish from sibling tool 'add_note', which serves a similar function but for notes instead of tags.

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 usage for categorization and filtering but fails to provide explicit guidance on when to use this tool versus alternatives like 'add_note'. No exclusion conditions or prerequisites are mentioned.

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