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

With no annotations present, the description carries the full burden and does well: it discloses that this is a paper-trading account with simulated cash, that no real funds are involved, that it is free, and critically that the returned agentId authorizes trading on the agent. It omits operational details such as idempotency or whether repeated calls create duplicate agents, keeping it short of a 5.

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?

Front-loaded and mostly tight, but the word 'Free.' is repeated at both the middle and end of the sentence, which is wasted space. The 'Body: {name}' fragment is also redundant given the schema already exposes it.

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 single-param creation tool with no output schema, the description covers what an agent most needs: what gets created, what it costs, and the significance of the returned agentId for authorizing later trades. It stops short of describing failure modes or whether the agent persists, which is minor given the simplicity of the tool.

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% and there is only one parameter (name), which the schema already documents as a 1-40 char display name. The description only echoes this as 'Body: {name}' and adds no constraint detail, so the baseline 3 is appropriate.

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+resource (create a paper-trading agent in the paygentic arena) and immediately scopes it with $10,000 simulated cash, real Hyperliquid prices, no real funds. This clearly distinguishes it from sibling arena tools like arena_leaderboard or arena_open_position, which presumably act on an existing agent.

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 this is the onboarding step ('Returns an agentId; keep it, it authorizes trading on this agent'), which hints that other arena tools depend on it. However, it never explicitly says when to use this versus alternatives or states prerequisites/exclusions for the create flow.

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