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

Annotations already establish readOnlyHint=true and openWorldHint=true, so safety profile is covered. The description adds that results are "verified" and returns exactly three ranked entries, which is useful beyond the annotations, but says nothing about data freshness, coverage limits, or what happens when no route exists in a state.

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 sentences, front-loaded with the outcome and followed by the return shape; nothing is wasted and no padding or marketing language appears.

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 responsibly explains that it returns the winner plus the next two cheapest. For a three-parameter, all-optional read tool this is nearly complete; only the optionality of state and the empty-result behavior are unaddressed.

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 coverage is 100%, so the baseline is 3. The description confirms the dimensions (state, drug, payment basis), though it frames the search as "in a given US state" while the schema marks state optional, and mentions only cash or insured while the enum also allows "any" — small mismatches the schema has to correct.

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?

Names a specific resource and outcome: "the cheapest verified way to get a GLP-1 in a given US state", with the result shape (winner plus next two cheapest) spelled out. It does not distinguish itself from siblings such as fair_price or get_price, so an agent cannot tell from the text alone when a price lookup should go through this tool instead.

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 implies context via the drug and cash/insured qualifiers, which hints at filtered lookups, but it never states when to prefer this over fair_price, get_price, or coverage. No exclusions or prerequisites are given, leaving the routing decision to inference.

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