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

readOnlyHint=true already covers the safety profile, so the bar is lower; the description adds real context by listing the returned payload (catalog variant, print files, retail price, sync status) and by mapping to the underlying endpoint GET /sync/products/{id}. It does not mention auth scope nuances beyond the store_id note already in the schema.

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?

Three compact sentences, front-loaded with the resource and its returned contents, then the id source, then the endpoint. Every sentence earns its place; nothing is padded.

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?

With no output schema, the description usefully enumerates the returned fields, and both parameters are fully documented in the schema. The only shortfall is the absence of any contrast with the sibling single-product getters, which an agent choosing among them would benefit from.

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 explains both product_id (numeric or @-prefixed External ID) and store_id (account-level token override). The description adds only the origin hint for ids via printful_list_sync_products, so the 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?

States a specific verb (fetch) and resource (one product imported from an integrated store), and enumerates what comes back (Sync Variants, catalog variant, print files, retail price, sync status). It implicitly separates itself from catalog-product siblings by specifying 'imported from an integrated store', though it never explicitly contrasts with printful_get_store_product or printful_get_catalog_product.

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?

Explicitly routes the agent to the id source ('Ids come from printful_list_sync_products'), which is the key upstream call. There is no explicit when-not guidance or comparison against the other single-product getters, so it stops short of a 5.

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