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

With only openWorldHint=true in annotations, the description carries most of the burden and does well: it states tiktok_listing is applied only when the product is synced to TikTok and silently ignored by other channels, explains merge/null-to-clear semantics, and discloses a limitation ('which this tool cannot' validate attributes). It does not mention permissions, reversibility, or error behavior, so it falls short of a 5.

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?

Information is front-loaded (primary purpose first, then two sibling redirects, then the tiktok_listing detail) and nearly every clause earns its place. The trailing artifact '[#ebe81c]' is meaningless noise that should not be in a tool description.

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 nested, no-output-schema mutation tool this is close to complete: it covers channel scoping, sibling alternatives, and the clearing semantics of the nested object. What is missing is the outcome side — whether the update is partial or full replacement, and what the caller gets back — which matters for a tool whose schema forbids additional properties.

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?

Top-level schema coverage is 0%, so the description must compensate, and it does for the important surface: it enumerates the updatable fields inside `changes` and explains the tiktok_listing merge/clear contract plus its channel-scoping. The `workspace` and `product_uuid` parameters get no explanation at all, which keeps this below 5.

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 opening verb+resource is explicit ('Update a product (name, description, price)') and it immediately names the two siblings that could be confused with it, cascade_price_change and set_listing_attributes. An agent can distinguish this tool from its nearest neighbours without opening any 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?

Routing is explicit in both directions: price changes that must propagate to synced channels go to cascade_price_change, and channel-defined attributes (Material, Style, Washing Instructions) go to set_listing_attributes with a stated reason (schema validation and refusal reporting). No condition is left to inference.

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