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

With no annotations provided, the description takes full responsibility and explicitly states 'Never broadcasts, never charges,' which is a critical safety guarantee. It also discloses that exact_cost_usd is 'LIVE from /agent-pricing-oracle' and the output shape is deterministic, including validation_errors[], providing rich behavioral detail.

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 dense but every clause serves a purpose: purpose, return shape, safety guarantee, usage guidance, and supported actions. It is front-loaded with the core purpose and avoids filler, though the long return shape string could arguably be summarized.

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?

Despite lacking an output schema, the description embeds a detailed return shape, compensating for that gap. It covers supported actions, usage timing, and safety semantics, though it doesn't address authentication or rate limits. For a simulation tool with a well-defined purpose, this is sufficient.

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 already provides 100% coverage with descriptions for both parameters, including tips for wallet/bond_amount fields. The tool description itself does not add additional parameter-level semantics beyond listing supported actions, which mirrors the enum. Baseline 3 applies due to high schema coverage.

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 opens with 'FREE dry-run for any paid action,' clearly identifying it as a simulation for paid actions. It lists supported actions (wrap, mint-sla, renew, micro-reset, early-exit) and contrasts with the paid siblings by emphasizing it never broadcasts or charges, making its role unambiguous.

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 explicitly advises 'Use BEFORE any paid tool to avoid wasted x402 settlements,' giving a clear usage context. It doesn't mention alternatives like simulate_action or simulate_paid_action_batch, but the single-action vs. batch distinction is implied by the sibling names.

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