merge_playlists

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

With no annotations, the description carries full weight. It explicitly discloses that the source playlist is deleted after the move, that duplicates are skipped, and that dry_run defaults to True to prevent accidental execution. This is strong transparency, though it omits edge cases like source==target or missing playlists.

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 concise and well-structured: the core operation is stated in the first sentence, followed by key behaviors, then a clear args list. Every sentence adds value without unnecessary 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?

Given the tool's moderate complexity and the presence of an output schema, the description covers the main aspects: operation, duplicate handling, dry-run safety, and parameter meanings. It does not address db_path or error scenarios, but these are secondary to the core use case.

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 compensates well for three of four parameters: source_id and target_id are explained with format hints, and dry_run is clearly described including its default behavior. However, db_path is entirely undocumented in the description, leaving a gap for that parameter.

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 a specific action ('Move all videos from SOURCE playlist into TARGET, then delete SOURCE') and names the exact resources involved. It distinguishes itself from sibling tools like delete_playlist (which deletes without moving) and suggest_merges (which only suggests candidates).

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 implies when to use the tool but does not explicitly state alternatives or exclusions. It conveys the merge-and-delete workflow, making it easy to infer usage, but lacks direct guidance such as 'use this instead of delete_playlist when you want to preserve videos.'

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