add_to_watchlist

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

Annotations already convey the non-read-only, idempotent, non-destructive profile. The description adds 'verify it', hinting at a confirmation behavior, but does not explain what happens on duplicate adds, auth failures, or the exact verification semantics.

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 sentence that leads with the action and states the target list and a verification step. 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?

For a one-parameter tool with annotations covering safety/idempotency, the description is nearly sufficient. It could mention how to obtain title_id (e.g., via search_titles) or clarify what 'verify' means, but these are minor omissions.

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 does not describe title_id's format, source, or meaning. The property name and title are self-explanatory, so this is not as severe as a fully opaque parameter, but the description adds no parameter-level value.

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 ('Add'), a clear resource ('a title to the authenticated user's IMDb Watchlist'), and a verification step. This clearly distinguishes it from siblings like remove_from_watchlist and list_my_watchlist.

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 intended use is implied by the action itself, but there is no explicit when-to-use guidance or comparison with alternatives. An agent must infer that this is the counterpart to remove_from_watchlist and distinct from list_my_watchlist.

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