merge_playlists

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

With no annotations provided, the description carries the full burden and discloses more than most: the dedup strategy (first-seen order wins), batching behavior (100 per batch), and the critical non-destructive fact that appending does NOT clear the target. It falls short of 5 by leaving ambiguities like whether existing target contents participate in dedup and what happens on partial failures.

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?

Three sentences with zero fluff: purpose first, then the two behavioral traits that matter most (dedup and batching), then compact routing for the two output modes. Every sentence earns its place and the critical 'it is NOT cleared' caveat is prominently included.

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 mutation tool with no annotations, no output schema, and 7 parameters, the description leaves gaps: it does not state what happens if neither target_playlist_id nor new_name is supplied (schema requires only sources), what the return value looks like, or failure semantics. Core workflow is well-covered, but an agent cannot fully predict the tool's behavior at the edges.

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%, so the baseline is 3; the description adds value by clarifying the relationship and implied mutual exclusivity between target_playlist_id and new_name, and by attaching dedup ordering semantics to sources that the schema does not express. This pushes it above baseline without duplicating what the schema already documents.

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 specific verb and resource ('Merge multiple playlists into one') and immediately distinguishes the tool from its many playlist-manipulation siblings by defining both execution modes (append to existing vs create fresh). The scope is unambiguous even before reading 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?

Gives clear within-tool decision guidance ('Pass target_playlist_id... or new_name...') but never teels agents when to prefer this over overlapping siblings like merge_playlists_plan, playlist_union, playlist_un on_preview, or dedupe_playlist_apply. Usage context is implied by the name and purpose rather than explicitly routed.

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