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

Annotations already declare readOnlyHint=true and destructiveHint=false, and the description reinforces this with 'Never executes' while adding a non-obvious caveat about raw units. It does not explain why idempotentHint=false (quote freshness/slippage), which would be the one remaining behavioral gap.

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?

Three tightly packed sentences with the core purpose front-loaded and no filler. Slightly dense but every clause carries routing, unit, or safety information.

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 3-param read tool with no output schema, the description names what comes back (expected output and price) and routes to the richer sibling. The exact response shape/decimals of the output is left implicit, a minor gap given no output schema exists.

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 tokenIn/tokenOut/amountIn are already fully documented, including the RAW-units note on amountIn. The description restates the raw-units requirement but adds no syntax or format detail beyond the schema; 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+resource ('Best executable quote for swapping tokenIn → tokenOut') with the chain context (Epsilon, Robinhood Chain id 4663) and the returned values (expected output and price). It explicitly distinguishes itself from the sibling get_route.

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?

Gives an explicit when-to-use ('quick price check') and when-to-use-the-alternative ('use get_route when you need the venue split, fee legs or minimum output for an order you will sign'). The selection criterion is fully specified.

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