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

Goes well beyond the destructive/non-idempotent annotations by disclosing that legs the user cannot settle are skipped and reported, that nothing is forced, and that no platform funds are used. This explains partial-execution semantics and fund-safety, exactly the behavioral context an agent needs before triggering a destructive write.

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 core intent is front-loaded, but the parenthetical API-key requirement appears at both the start ("Needs your api_key") and end ("needs your linked account's key"), which is redundant. The venue-routing detail is useful but dense, and the repeated key clauses dilute an otherwise information-rich description.

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 destructive trade tool with annotations covering side-effects and no output schema, the description supplies the essential behavioral and sequencing context (routed execution, partial fills, fund source). It stops short of describing what is returned or what happens if every leg is skipped, but is otherwise sufficiently complete to invoke correctly.

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 80%, so the schema already documents most parameters; the description mainly reinforces that usdc_amount is the user's own money and that api_key comes from register_agent. It adds little interpretation of theme, asset_class, or conversation_id beyond what the schema provides, so 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 and resource ("PLACE a theme basket trade") and explains the routed execution model where each leg hits its best venue. The phrase "through the routed plan" implicitly distinguishes it from the upstream route step, but it never names theme_journey_route or theme_journey_basket explicitly to make the sibling boundary crisp.

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?

"Call after confirm_action" provides an explicit sequencing prerequisite, which is the key gating condition for a destructive trade. It lacks explicit 'do not call if...' exclusions and references a confirm_action step that isn't in the sibling set, but the when-to-use signal is clear.

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