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

With no annotations provided, the description carries the full behavioral burden, and it succeeds. It explicitly discloses zero writes, zero cost, that preconditions are re-run against the same tables, that the response includes the predicted outcome and exact refusal, and that the response names the live endpoint. This gives an agent strong expectations for side effects and results.

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 front-loaded with the most important facts (FREE, ZERO writes, ZERO cost) and then gives necessary enumerations and examples. It is longer than a single-sentence description, but the length is justified because it documents three distinct action-specific parameter shapes in the absence of schema descriptions. Only minor redundancy exists between 'ZERO writes and ZERO cost' and 'before spending'.

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 has only two parameters but supports three action-specific payload shapes, the description provides enough context for an agent to construct valid calls for every supported action. An output schema exists, so return-value details are not required. The description covers behavior, action options, example parameters, and the relationship to the live endpoint, making it complete for correct invocation.

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 0%, so the description must compensate, and it does thoroughly. It enumerates all valid 'action' values and provides concrete example JSON for each action's 'params', covering sports_bet, upgrade, and claim_job. This is essential parameter meaning that the input schema alone entirely lacks.

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 uses a specific verb ('Simulate') and resource ('one paid-world action'), and immediately distinguishes itself from live actions by stating 'ZERO writes and ZERO cost' and 'before spending USDC or AGWC'. It also names the exact supported actions, making its scope unambiguous even among many sibling tools.

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 clearly indicates when to use it: before spending tokens, to preview the outcome of a paid-world action without committing. It contrasts with the live endpoint by noting the live route 're-validates everything at settlement time'. However, it does not explicitly name alternative tools or state 'do not use for actual execution', so the exclusion is implied rather than fully explicit.

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