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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety is partly covered, and the description reinforces 'Read-only and public'. Its real added value is the explicit disclosure of what is withheld (ZIP, private storage URLs, secrets, whole paid source files, signed download URLs), which tells the agent what to expect in the payload and prevents misuse. No auth or rate-limit detail is given, keeping it from 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?

Two tight sentences: the first front-loads what is returned, the second front-loads what is never returned, followed by a short safety tag. Every clause carries distinct information and nothing is redundant.

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 must describe the return shape, and it does so concretely (docs excerpts, file tree, screenshot/demo links, sample snippets) while bounding what is excluded. For a single-parameter read tool this is complete enough to call 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 100% and there is a single documented parameter (product_id), so the schema fully carries parameter meaning. The description adds nothing about the identifier format, so the baseline 3 applies.

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 (get/return) and resource (product previews) and enumerates exactly what is returned: documentation excerpts, file-name tree, screenshot/demo links, sample snippets. The negative list (never the purchased ZIP, private URLs, secrets, paid source files, signed URLs) clearly separates it from get_purchase_access and get_product_details.

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 scope ('safe public previews only', 'read-only and public') implies this is the pre-purchase, non-privileged browsing tool, and the exclusion list hints at when to reach for a different tool. However, it never names an alternative sibling or states an explicit condition such as 'use this before purchase; use get_purchase_access for owned items', leaving routing to inference.

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