gmail_update_label

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It indicates mutation ('Update') but fails to mention side effects (e.g., immediate propagation), required permissions, rate limits, or idempotency. The description adds little beyond the tool name.

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 sentence with no filler. It front-loads the action and resource, and efficiently summarizes the key editable attributes. Every word earns its place.

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?

The tool has 6 parameters and mutates state, yet the description does not address return value (likely the updated label), required 'labelId', or how visibility/color options work. Without an output schema, more context is needed for safe and effective use by an AI agent.

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?

All 6 parameters have descriptions in the schema (100% coverage), so the description's mention of 'name, visibility, color' adds marginal context by grouping them. However, it does not explain the enumerated options or format expectations beyond what the schema provides. Baseline is appropriate given full schema coverage.

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 'Update' and the resource 'existing Gmail label', and lists the attributes that can be changed (name, visibility, color). This suffices to differentiate from sibling tools like gmail_create_label or gmail_delete_label, but does not explicitly distinguish from gmail_modify_labels (which modifies labels on messages).

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 updating label properties but provides no explicit guidance on when to use this tool versus alternatives like gmail_modify_labels (for assigning labels to messages) or gmail_create_label. There are no prerequisites or exclusions mentioned.

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