remove_from_watchlist

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

Annotations already indicate this is a mutating tool (readOnlyHint=false), so the description does not need to relabel that. It does add a useful operational prerequisite, the PLEX_ENABLE_MUTATIVE_OPS=true requirement, but it does not mention idempotency, failure behavior, or what happens if the item is not on the watchlist.

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 front-loaded sentence that states the action, target, and supported keys with no filler. The minimal helpful qualification about PLEX_ENABLE_MUTATIVE_OPS is included without bloat.

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 simple two-parameter mutation, the description plus schema is almost sufficient. The one notable omission is what the tool returns or whether removal is idempotent, but the input mechanics and prerequisite are well covered.

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%, so the parameter docs already explain plexGuid and ratingKey. The description reinforces the two-identification-modes idea but does not add significant meaning beyond what the schema already provides.

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 ('Remove'), a specific resource ('movie or show'), and a specific target ('account watchlist'), and it names both allowed identifier types. This makes it unambiguous and distinct from siblings like remove_from_playlist.

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 clearly says the tool is for removing watchlist entries and even states the required PLEX_ENABLE_MUTATIVE_OPS=true prerequisite. It does not explicitly contrast with alternatives or state when-not-to-use, but the operation and context are clear.

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