list_labels

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

The readOnlyHint annotation already covers the absence of write side effects, and the description is consistent with that. The description adds little beyond repository scope; it does not disclose pagination, sorting, or default limits, but these are minor and partially recoverable from the schema and output schema.

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 front-loaded sentence with no filler, which is appropriate for a simple read-only operation. It is slightly under-specified, but economy is a strength here.

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 list-labels call, the description plus the schema (required owner/repo, optional page/limit, existing output schema, and readOnlyHint) is largely sufficient. It does not explain pagination defaults or ordering, but those are minor and not required for correct invocation.

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%, and the description names none of the four parameters. It does not explain how page and limit behave or clarify owner/repo beyond their schema titles, so the low-coverage requirement for description compensation is not met.

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 uses a specific verb ('List') and a precise resource ('issue labels') with repository scope, making the operation unambiguous. It is clearly distinct from sibling tools such as create_label and list_issues because it names the exact object type and action.

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?

No guidance is given about when to choose this tool over alternatives or when not to use it. There is no mention of create_label for creating labels or list_milestones for other repository metadata, so an agent must infer usage from the tool name and sibling list.

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