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

Annotations already declare destructiveHint=true, openWorldHint=true and idempotentHint=true, but the description adds non-obvious consequences: the edit goes live and propagates to Stripe, and confirm:true is a gating consent flag that must only be passed after user agreement. It also notes that includedProductIds REPLACES the existing list, a real behavioral hazard not visible in annotations. It does not restate idempotency (covered in the schema), which is acceptable.

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?

One dense paragraph, front-loaded with domain scope before the field list and the confirm gate. Every clause carries information, though the two-sentence payment/purchase disclaimer is arguably slack for an editing tool and could be trimmed without loss.

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 16-parameter mutation with no output schema, the description covers scope, partial semantics, ID provenance, replace-list behavior and the consent-gated live edit, which is close to complete. The main remaining gap is that nothing is said about what the call returns or whether a subsequent read (get_store_product) is needed to verify, though with annotations present this is a minor omission.

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 a baseline of 3 applies. The description earns above baseline by grouping which fields are editable (title, description, price/strike-through, currency, cover, slug, stock limit, refund guarantee, bundle/membership membership lists, billing interval, member note) and by stating the crucial partial-update contract ('only what you pass changes') plus the replace-vs-merge behavior of includedProductIds. It stops short of adding format or units detail the schema doesn't already supply.

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+resource ('Change a product') and pins the identifier source ('productId from list_store_products'), which separates it from create_store_product, publish_store_product and update_store_block without opening a schema. The opening framing of the store domain ('business's own link-in-bio store in Ignix', customers pay via the business's own Stripe) further disambiguates it from commerce/payment tools.

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 operating context: partial-update semantics ('only what you pass changes'), the dependency on list_store_products for the ID, and the condition that editing a PUBLISHED product requires confirm:true only after user agreement. It does not explicitly name sibling alternatives (e.g. create vs publish vs unpublish), so it falls short of a full when/when-not/alternative statement.

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