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

The annotations already declare readOnlyHint=true and idempotentHint=false, so the safety profile is covered. The description adds useful behavioral context by naming the returned fields ('asset, total units, and depth'), which is valuable because there is no output schema, though it omits ordering or freshness details.

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 short sentences, front-loaded with the core action and scope, and no wasted words. The second sentence efficiently describes the return contents.

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 zero-parameter, read-only listing tool without an output schema, the description gives enough context: it states the resource scope and the fields each unit includes. Minor omissions such as ordering or whether empty results are possible keep it from being fully complete.

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 there are no parameter semantics to document; the baseline for 0 params is 4. The description correctly does not waste space explaining nonexistent parameters.

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 states a specific verb ('Returns') and resource ('all trade units across all trade assets'), making the scope clear. It does not explicitly contrast itself with the singular sibling get_trade_unit, so it falls short of full sibling differentiation.

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?

It implies usage by saying 'Returns all trade units,' but gives no explicit guidance on when to choose this over get_trade_unit, list_trade_accounts, or other related siblings. There are no stated alternatives, exclusions, or conditions.

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