create_label

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

The description notably discloses that the description is sent through stdin and not written to the audit log — a meaningful, non-obvious behavioral trait. The annotations (readOnlyHint=false, destructiveHint=false, idempotentHint=false) are consistent; there's no contradiction, and the description adds value beyond annotations by explaining the stdin/audit-log detail.

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?

A single efficient sentence that includes purpose and one behavioral nuance. No wasted words, though it could add a bit more 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 straightforward create-operation with annotations covering safety (non-idempotent mutation), the description is acceptable but thin. No return-format details, no explanation of what 'allowed repository' means, and no guidance on the 'color' parameter format. It's a minimally viable description but leaves the agent to infer several operational 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 only 17% (only 'repository' has a description). The tool description adds no parameter-level detail beyond the schema. With 6 params and 4 required (account, repository, name, color) largely undocumented, the description does not fill the gap, especially for the meaning of 'color' and 'description'.

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 'Create a label in an allowed repository' with a specific verb and resource. It's clear but doesn't distinguish from the sibling tool update_label, though the verb 'create' vs 'update' provides implicit differentiation.

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 on when to use this vs other label-related siblings like list_labels, add_issue_labels, or update_label. The phrase 'allowed repository' hints at some access constraint but doesn't explain prerequisites or exclusions.

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