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

There are no annotations, so the description carries the full burden. The phrase 'List all' implies a read-only, non-destructive operation, but it does not disclose return format, pagination, error handling, or behavior for invalid addresses. The core behavior is clear, but additional context is missing.

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, direct sentence with no redundancy. Every word contributes meaning: 'List all agent addresses registered on Tracea by a given owner address.' It is efficiently structured and front-loaded.

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?

This is a simple one-parameter list tool with no output schema and no annotations. The description adequately states what it returns (agent addresses) and the input condition (owner). It could further clarify whether the list includes all statuses (e.g., revoked agents) or the return shape, but overall it is sufficiently complete for a basic lookup.

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 input schema provides a full description for the only parameter 'owner_address' (Ethereum address of the owner), giving 100% schema coverage. The description's phrase 'by a given owner address' adds no new semantics beyond the schema. Baseline 3 applies because schema coverage is high.

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 'List all agent addresses registered on Tracea by a given owner address,' which clearly identifies the action (list), the resource (agent addresses), and the scoping condition (owner address). This distinguishes it from sibling tools like get_agent_info or get_agent_actions, which target different resources or scopes.

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 needing agent addresses for a specific owner) but does not explicitly state alternatives, exclusions, or prerequisites. Sibling tools are available but not referenced. This is adequate but not explicit.

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