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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the read-only behavior is covered. The description adds minimal context (that it targets a single pair) but does not disclose any additional behavioral traits such as payload format or rate limits. No contradiction exists.

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 states the action and object clearly. Every word earns its place; there is no redundancy or fluff.

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?

Given the tool's simplicity (1 parameter, no nested objects) and rich annotations, the description is mostly complete. However, the lack of an output schema means 'details' is vague; the agent might not know what fields are returned. Still, the tool name and purpose help fill the gap, and the annotations cover safety aspects.

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%, with the only parameter (currency_pair) fully described in the input schema with an example. The tool description adds no additional meaning beyond the schema, so the baseline of 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 clearly states the action (Get) and resource (details of a single currency pair). It distinguishes from siblings like cex_spot_list_currency_pairs (which lists all pairs) and cex_spot_get_currency (which gets a currency, not a pair), though it does not explicitly name alternatives.

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 phrase 'single currency pair' implies use when you need details for one specific pair rather than all pairs, but there is no explicit guidance on when to use this vs. alternatives like list_currency_pairs or get_spot_tickers. Usage context is only implied, not clarified.

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