Update multiple items at once

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

No annotations are provided, so the description carries the transparency burden. It discloses the batching behavior ('single save round-trip') and the partial update capability ('and/or'), but does not mention error handling, atomicity, permissions, or side effects. This is minimal but not fully absent.

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 a single, tightly written sentence that front-loads the action and scope. It includes no fluff, filler, or redundant repetition of the tool name.

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?

This is a complex batch mutation tool with a nested schema and no output schema. The description covers what it does and that it batches, but lacks guidance on return values, failure modes, per-item validation, or the categoryId requirement for flag edits. For a tool of this complexity, the description leaves significant operational gaps.

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 add meaning by enumerating the supported field and flag names (name/description/price/weight/url/imageUrl and qty/worn/consumable/star), but it does not explain the updates array structure, itemId requirement, or the categoryId prerequisite for flag changes. The schema itself provides some of this, but the description only partially compensates.

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 uses a specific verb ('Applies') with a clear resource ('field edits ... and/or flag edits') and scope ('across many items in a single save round-trip'). This clearly distinguishes it from siblings like update_item, set_item_quantity, and add_items_batch.

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 phrase 'across many items in a single save round-trip' establishes the clear context for batch updates versus single-item tools. It does not explicitly name alternatives or state when not to use it, but the batch scope is unambiguous enough to guide selection.

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