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

Annotations already declare readOnlyHint and openWorldHint, and the description usefully adds that the link is tracked (click/sales attribution, per the sub parameter described in the schema). However it does not disclose link persistence or expiry, idempotency of repeated calls, or rate limits, and the verb "Create" sits in mild tension with readOnlyHint even though generating a URL is effectively side-effect free.

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 with the core action and the optional deep-link case front-loaded, followed immediately by the input-source instruction. No filler, nothing repeated from the schema or title.

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 simple single-required-parameter tool with full schema coverage and no output schema, the description covers purpose, input source, and the optional page targeting. The only gap is that with no output schema it never states what is returned (a URL string) or whether the link is reusable.

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 carries all three parameters, including the store id format and the sub identifier constraints. The description re-anchors store ("from search_stores") and clarifies pageUrl as a product or category page on the store's own site, but adds only marginal meaning beyond the schema.

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?

Specific verb and resource ("Create a tracked link to a store") with the scope spelled out, including the optional deep-link to one product or category page. An agent can immediately distinguish this from the sibling search_* tools, which retrieve data rather than produce a link.

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 description establishes the input flow explicitly: "Use the store id from search_stores," telling the agent to obtain the identifier from a sibling tool first. It does not state when to use the optional pageUrl or sub, and there is no named alternative to avoid, so it stops short of full when/when-not guidance.

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