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

Annotations already declare readOnly, idempotent, non-destructive, and closed-world behavior. The description adds meaningful context beyond that: the link initiates a FreeRateUpdate request and enables lenders/brokers in the network to contact the person, and it can be opened or shared. It does not cover link expiration, data privacy implications, or whether the link can be reused, but the added context is useful.

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?

The description is two sentences with no filler, and the core purpose is front-loaded. The first sentence is somewhat long, but every clause contributes context about what the link does; the second sentence cleanly summarizes the two usage modes.

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 and a single fully documented parameter, the description is largely complete: it explains that the tool produces a link, what the link enables, and how to use or share it. Minor omissions like link lifetime or privacy considerations are not critical for correct invocation, but they would make it more complete.

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?

There is only one parameter, 'product', and schema description coverage is 100% (the schema documents it as 'What the person wants' with an enum). The description says 'for one product', which echoes the schema without adding format or selection guidance beyond the enum values. Baseline 3 is appropriate when the schema already carries the parameter meaning.

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 description clearly identifies the resource as a link that starts a FreeRateUpdate request for one product, and explains its purpose in connecting the person with lenders/brokers. It is distinguishable from sibling tools like get_heloc_rates or get_lender_score, though it never explicitly says the tool returns a link (the phrasing 'The link that starts...' implies it).

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?

It gives concrete usage instructions: open the link in the person's browser, fill in and submit the short form for them using their own details, or give them the link. It does not state when to prefer this over alternatives or any preconditions (e.g., required person data), but the operational guidance is strong for this simple tool.

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