Create collection

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

Since no annotations are provided (such as destructiveHint or readOnlyHint), the description carries full burden to disclose behavioral traits. It explicitly states that Audiobookshelf rejects empty collections and that library_item_ids are required and must reference books from the given library, revealing constraints beyond the schema such as the server validation rule. This provides useful behavioral context without contradictions.

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 only two sentences, both adding essential information (purpose and key constraint). It is front-loaded and wastes no words. However, the constraint about non-empty collections could be seen as behavioral rather than a usage guideline, but overall it is efficient.

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 no output schema and 100% schema coverage, the description sufficiently covers the core behavior and critical constraints (rejection of empty collections, item type restriction). It does not discuss return values or side effects, but with no output schema that is acceptable. For a creation tool with required parameters and server validation, it provides enough context for an agent to use it correctly.

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 100%, so the schema already documents all four parameters. The description adds no additional parameter-level meaning beyond what is in the schema, e.g., it does not explain the format of library_item_ids or the relationship between library_id and items. Baseline 3 is appropriate.

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 creates a collection of books with a specific verb ('Creates') and resource ('collection'), and distinguishes from siblings like 'add_books_to_collection' or 'update_collection' by indicating this is the initial creation action. It provides specific constraints (non-empty, must be books from the library).

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 (creating collections) but gives no explicit guidance on when not to use this tool versus alternatives like 'update_collection' or 'add_books_to_collection'. It mentions rejection of empty collections which helps set expectations but does not discuss context like prerequisites or alternatives.

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