balena_create_tag

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

Annotations already indicate readOnlyHint=false, destructiveHint=false, and idempotentHint=false, so the description doesn't need to restate those. The description adds the scope of tag targets (device, fleet, release) but does not disclose behavior such as whether duplicate tags are rejected, whether tags are overwritten, or any rate limits. With annotations covering the basic safety profile, a 3 is appropriate.

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 concise sentence that front-loads the action and resource. It is efficient and easy to parse, though it could have added a bit more context without becoming verbose.

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 creation tool with four required parameters and no output schema, the description is thin. It does not explain what the tag key/value represent, how owner_id is determined, or what happens on success/failure. The sibling tools show a rich tag management context, but this description alone leaves an agent guessing about important invocation details.

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 0%, so the description must compensate for the four parameters. It only clarifies the 'kind' parameter by listing its valid values (device, fleet, release) but provides no additional meaning for 'key', 'value', or 'owner_id'. The schema gives basic types and constraints, but the description adds almost no semantic context beyond what the enum already shows.

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 'Add a tag to a device, fleet, or release' clearly states the action (add) and the resource (tag) with the valid target kinds. It distinguishes from sibling tools like balena_list_tags, balena_update_tag, and balena_delete_tag by indicating creation, though it doesn't explicitly name those alternatives.

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 creating tags on the three supported kinds, and the sibling list shows related tag management tools. However, it does not explicitly state when to use this tool versus balena_update_tag or balena_list_tags, nor does it mention any prerequisites like ownership or existing resources.

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