Update YouTube Playlist

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It reveals the tool is a mutating operation ('Updates') and implies an authorization constraint, but it does not explain whether updates are partial or full, what happens if the playlist doesn't exist, or any other side effects. This is minimal transparency.

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, well-structured sentence that efficiently conveys the core purpose. Every word earns its place, with no redundancy or fluff.

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?

The tool has 4 parameters, no annotations, and no output schema, so the description should provide more operational context. It does not mention update semantics (e.g., which fields are updated, whether missing fields are preserved), prerequisites, or error scenarios. The description is too thin for a mutating tool, though it does identify the ownership requirement.

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%, so the description must compensate by explaining parameter meanings. It does not. The description only says 'metadata' without clarifying how each parameter (e.g., URL format, title constraints, privacy status) should be used, leaving semantics entirely to the schema's structural constraints.

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 clearly states the tool updates metadata on a playlist, using a specific verb ('updates') and resource ('playlist'). The phrase 'owned by the authenticated channel' adds ownership context, and 'metadata' distinguishes it from sibling tools like add/remove playlist items, making its purpose 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?

The description provides clear context by specifying that the playlist must be owned by the authenticated channel, implying it should be used for modifying existing playlists. However, it lacks explicit exclusions or references to alternatives (e.g., create_playlist for new playlists), so it falls short of a 5.

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