update_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 usefully adds the quota cost ('Costs 50 quota units'), which is valuable operational context not in the schema. However, it lacks other critical behavioral details: it doesn't specify authentication requirements, rate limits, error conditions, or whether the update is partial (only specified fields) or has side effects. The description doesn't contradict annotations (none exist).

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 appropriately sized and front-loaded: the first sentence states the core purpose and quota cost, followed by a structured 'Args' section. Every sentence earns its place, with no redundant information. However, the formatting with 'Args:' and bullet-like indentation is slightly informal and could be more integrated, preventing a perfect score.

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?

Given that this is a mutation tool with no annotations, 4 parameters, 0% schema coverage, but with an output schema (which relieves the description from explaining return values), the description is moderately complete. It covers parameters well and adds quota cost, but gaps remain: no usage guidelines, incomplete behavioral context (e.g., permissions, errors), and no mention of sibling tools. This makes it adequate but not fully comprehensive for safe agent use.

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. It does this effectively by explaining all 4 parameters: 'playlist_id' is identified as the playlist ID, and the other three parameters are described with their purposes and the meaning of 'None' (to keep current values). It also specifies allowed values for 'privacy_status' (private, unlisted, public). This adds significant meaning beyond the bare schema, though it doesn't cover validation rules or examples.

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 verb ('Update') and resource ('playlist metadata'), making the purpose immediately understandable. It distinguishes this tool from siblings like 'create_playlist' and 'delete_playlist' by focusing on modification rather than creation or deletion. However, it doesn't explicitly differentiate from 'update_video' or other update operations beyond the resource type.

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 no guidance on when to use this tool versus alternatives. It doesn't mention prerequisites (e.g., ownership/permissions), compare with 'create_playlist' for new playlists, or indicate when not to use it (e.g., for bulk updates). The only implicit context is that a playlist must exist, but this is not stated explicitly.

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