timetree_update_calendar_labels

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

With annotations present, the description would need to carry full behavioral burden; it does so in a useful way by disclosing a required confirmation guard and the non-destructive partial behavior for labels not included. It does not detail error responses or reversibility, but it goes beyond tautological 'update' phrasing and prevents an agent from assuming a full overwrite.

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 with the main verb first, the confirmation requirement second, and the key preservation behavior last. Every clause adds decision-relevant information and there is no filler or repetition.

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 small three-parameter surface, the description plus input schema covers calendar identification, the labels payload, and the mandatory confirm flag. The lack of an output schema or return-value explanation is notable, but for a guarded write tool the agent likely needs the key, unless the calibration is calibrated by whether it can invoke correctly and understand side effects; it can.

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 33%, but the description adds meaning to the labels parameter by clarifying that name/color and omitted labels are preserved. However, calendar_id is left entirely to the schema’s simple name/type representation, and the confirm parameter is largely defined by the schema's const and description rather than enriched in the tool 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 opens with a specific verb-resource pair, 'Merge-update TimeTree label names/colors', which identifies exactly what the tool does and narrows the scope to label names and colors. This also separates it from read-oriented siblings like timetree_get_calendar_labels without needing to inspect schemas.

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 gives clear usage context by explaining that confirm=true is required and that omitted labels are preserved, which tells the agent this is a partial merge update rather than a full replacement. It does not explicitly list sibling alternatives or exclusions, but the usage pattern is concrete enough for a long-tail update tool.

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