list_plex_oauth_libraries

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

Annotations disclose that the operation is read-only, idempotent, and non-destructive, so the description adds no behavioral context beyond those structured signals. It does not mention response behavior, pagination, or any side effects, but it also does not contradict the annotations.

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 very short, but it contains redundant lines: 'GET plex/oauth/libraries' and 'GET /api/plex/oauth/libraries' say essentially the same thing. It is minimal but wastes one sentence on duplication without adding useful structure or semantics.

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 and presence of an output schema cover safety and return structure, and the zero-parameter input makes invocation straightforward. However, the description omits any semantic context about what 'libraries' means in the Plex OAuth flow, leaving the tool ambiguous in a family of many similar Plex OAuth tools.

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?

The tool has zero parameters and 100% schema description coverage, so the 0-parameter baseline of 4 applies. There is no parameter explanation needed because there is nothing to configure.

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 only restates the tool name as an HTTP endpoint ('GET plex/oauth/libraries') without explaining what these libraries are or what the operation actually returns. It is essentially a tautology of the name, not a meaningful purpose statement.

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?

There is no guidance on when to use this tool, what OAuth flow step it belongs to, or how it differs from sibling tools like list_plex_oauth_servers or list_plex_oauth_pin. The agent is left to infer usage entirely from the endpoint path.

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