Add to watchlist

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

Annotations already declare readOnlyHint=false, idempotentHint=true, and destructiveHint=false, so the mutation/idempotency profile is covered structurally. The description adds nothing beyond that: no word on what happens with duplicate entries, invalid IDs, or partial failures when multiple items are submitted.

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 waste-free sentence, well front-loaded, but its brevity comes from under-specification rather than disciplined editing. It says the minimum and leaves the rest to the schema.

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?

Annotations cover the safety profile and the schema is fully documented, so an agent can technically invoke it. Gaps remain around batching behavior, duplicates, and the fact that neither parameter is required (empty call semantics are undefined).

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 100% with per-field examples for imdb and tmdb IDs, so the baseline is 3. The description only echoes the two parameter concepts ('movies/shows') without adding format or batching semantics.

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?

States a specific verb ('Add') and resource ('movies/shows to the user's watchlist'), which clearly distinguishes it from get_watchlist and remove_watchlist_items by action. It doesn't explicitly name the sibling alternatives, but the action+resource is unambiguous.

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 about when to use this versus remove_watchlist_items, add_list_items, or mark_watched, and no prerequisites stated. An agent must infer the use case from the name alone.

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