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

Annotations already indicate a non-read-only, non-destructive operation, and the description adds meaningful behavioral context by specifying that the updatable data is 'seller-owned public metadata' and that 'immutable pack versions are never overwritten'. This directly reassures agents that version content is safe from modification, going beyond what the annotations alone convey. No contradiction with annotations exists.

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, front-loaded sentence with no filler: it states the action and resource first, then adds the critical immutability constraint. This is appropriately compact for a tool whose schema already carries most structural detail. A small expansion covering parameter behavior or usage routing would still fit comfortably without harming conciseness.

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 update tool with eight top-level parameters, a deeply nested listing object, no output schema, and minimal annotations, yet the description only provides scope and immutability. It does not clarify whether updates are partial or full replacement, how the required productId relates to ownership, what validation constraints apply, or what the response/result of the update looks like. Agents are left with substantial uncertainty about how to invoke this tool 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 only 13%, and the description does not compensate by explaining any of the eight parameters or the nested listing object. The generic term 'public metadata' gives a high-level category but adds no field-level meaning beyond what property names like tags, models, priceUsd, or shortDescription already suggest. Given the low coverage, the description should have clarified at least the key editable fields or the update semantics.

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 ('Update') and identifies the resource as 'seller-owned public metadata', making it clear this is a metadata-editing operation rather than a version upload or publish action. The phrase 'immutable pack versions are never overwritten' further distinguishes it from operations that modify the pack content itself. However, the description does not explicitly tie it to the 'draft' lifecycle stage in the tool name, and 'listing details' in the title vs 'public metadata' in the description introduces slight ambiguity.

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?

There is no explicit guidance about when to use this tool versus alternatives such as upload_ai_pack, publish_ai_pack, or create_ai_pack_draft. The statement about immutable pack versions implies this tool is for metadata-only updates and not for changing pack content, but the implication is left for the agent to infer. With a large sibling set, explicit routing or exclusions would have been valuable.

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