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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint=false, and destructiveHint=false. The description adds meaningful behavioral context by specifying that the result is a deterministic sim_v1 fixture and explicitly not a real transaction. It does not disclose error behavior or auth needs, but for a simple read-only sandbox tool this is a useful supplement.

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 definition is a single front-loaded sentence with no wasted words. The core action and the key sandbox caveat are both delivered immediately.

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?

An output schema exists and annotations cover the safety profile, so the description need not explain return values or side effects. Still, it leaves gaps around when to use this retrieval versus create_sandbox_verification and what the required identifier represents.

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 for the single 'identifier' parameter. It only indirectly implies that the identifier selects which deterministic fixture to retrieve, without specifying format, meaning, or expected values.

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 a specific verb ('Retrieve') and object ('deterministic sim_v1 fixture'), and clarifies that it is not a real transaction. However, 'sim_v1 fixture' is jargon and it does not distinguish this tool from the sibling create_sandbox_verification or explain what a 'sandbox verification' retrieval actually returns.

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?

There is no explicit guidance on when to use this tool versus create_sandbox_verification, explain_result, get_coverage, or plan_verification. The phrase 'not a real transaction' gives some implicit sandbox context, but no when-to-use or when-not-to-use conditions are stated.

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