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

Annotations already communicate that this is a read-only, open-world operation, so the description does not need to restate that. It adds useful behavioral context with 'real-time' and the $0.001 USDC cost. It does not disclose data sources, latency, failure behavior, or rate limits, but the annotation coverage lowers the burden.

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 a single, front-loaded sentence that packs the key facts: real-time, pair, DEX oracle, network, and cost. There is no filler or unnecessary repetition of the tool name. It is appropriately concise for a simple one-parameter tool.

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 read-only oracle with one optional parameter and an output schema, the description is largely complete: it states the network, pair, real-time nature, and cost. Minor gaps remain, such as whether the pair parameter accepts only ETH/USDC or other tickers, but the schema and output schema cover much of the remaining context.

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 documents the single 'pair' parameter. The description reinforces the default ETH/USDC pair but adds no additional meaning beyond the schema. The description could have clarified whether arbitrary pair tickers are supported, given the schema allows any string.

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 a specific function: resolving real-time ETH/USDC spot prices via a DEX oracle on Arc Mainnet. It also distinguishes itself from generic weather/forex oracles by naming the network and pair. It stops short of a 5 because 'resolver and DEX oracle' is somewhat broad and does not explicitly differentiate itself from arc_network_oracle_query.

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 when to use the tool: when a real-time ETH/USDC spot price on Arc Mainnet is needed. However, it gives no explicit guidance about alternatives, exclusions, or cases where a different oracle should be used instead. The usage context is inferable but not stated.

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