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

Annotations already declare destructiveHint=true and idempotentHint=true, but the description adds critical behavior beyond them: the videos inside are NOT deleted, the action is irreversible, the exact return shape { deleted: true, playlist_id }, and a concrete cost of 50 quota units. That is exactly the context an agent needs before a destructive call.

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?

Four short sentences, each carrying unique information: the action, the non-destructive effect on videos, irreversibility, return shape and cost. No padding.

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 two-param destructive tool with full annotation coverage, the description supplies the return value, irreversibility, side effects on contained videos and quota cost. Nothing an agent needs to call it safely is missing, even without an output schema.

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 coverage is 100% and both parameters are documented in the schema (profile_id hashid, playlist_id from youtube_playlists_list). The description adds no parameter meaning beyond that, so the baseline 3 applies.

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 precise verb and resource ('Delete a playlist from a connected YouTube channel') and implicitly scopes it apart from sibling operations like youtube_playlist_update, youtube_playlist_create and youtube_playlists_list. The agent can distinguish it without opening the schema.

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 gives clear usage context (deleting a playlist on a connected channel) and indirectly points at youtube_playlists_list via the playlist_id schema. It does not state when to prefer alternatives or warn against e.g. deleting the wrong playlist, so it falls short of explicit when/when-not guidance.

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