get_latest_prices

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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds only the returned field set (buy/ask/last), which duplicates the output schema, and says nothing about rate limits, market count, or freshness/staleness of the prices. With annotations carrying the safety burden, a 3 is appropriate.

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 front-loaded sentence with no filler. The scope qualifier ('all CoinSpot markets') is placed where it matters most for disambiguation, and nothing is repeated from the schema or annotations.

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 no-parameter read tool with an output schema present, the description covers the essential purpose; return values need not be explained. It could still note breadth (e.g. how many markets / pagination) or freshness, which are the only realistically useful additions.

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?

The tool takes zero parameters, so the baseline is 4. There are no parameter semantics for the description to clarify, and it correctly introduces none.

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 (Get) and resource (latest buy/ask/last prices) with an explicit scope: all CoinSpot markets. The 'all markets' scope implicitly separates it from the singular sibling get_latest_coin_price, but the description never names that alternative, so differentiation is inferential rather than explicit.

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?

Usage is only implied by the scope phrase 'for all CoinSpot markets' – an agent can infer this is the bulk version versus get_latest_coin_price, get_buy_price, or get_sell_price. There is no explicit when-to-use or when-not-to-use statement and no alternative is named.

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