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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered and the description does not contradict it. The description adds one piece of value over the annotations by disclosing that the response includes a link to the full head-to-head page — helpful given there is no output schema — but says nothing about ordering of a/b or behavior when both slugs are identical.

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?

A single compact sentence with no waste, front-loading what the tool returns. It is slightly fragment-like rather than a full statement of action, but nothing needs to be trimmed.

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 two-enum-parameter read tool with full annotation coverage, the description covers the essentials and even hints at the return payload. It stops short of stating output shape beyond the link, ordering semantics, or the duplicate-lender edge case, leaving minor gaps an agent could stumble on.

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 both parameters are constrained enums of lender slugs, so the schema does the heavy lifting. The description adds only that the two inputs are 'investor lenders', with no clarification of whether argument order matters or what happens on a duplicate pair; 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?

The description names the resource (two lenders' published terms) and the operation (side-by-side comparison), which is specific enough to separate it from get_lender_terms, which returns a single lender. It is phrased as a noun fragment rather than an explicit verb+resource statement, but the intent is unambiguous.

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 gives no when-to-use guidance and never mentions the alternatives: get_lender_terms for a single lender, or match_deal / dscr_check for other tasks. An agent must infer the comparison use case entirely from the tool name and the phrase 'side by side'.

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