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

With no annotations provided, the description carries the full burden of behavioral disclosure. It mentions the core guarantee ('exactly once') but does not disclose potential side effects, error behavior, or whether the operation is a write or read. The term 'firewall' adds conceptual color but not concrete 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 a single, concise sentence that front-loads the core concept 'Idempotency firewall'. Every word earns its place, and there is no fluff or repetition of schema details.

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 no annotations, no output schema, and only two parameters, the description is too minimal to be contextually complete. It does not explain what the tool returns, how it handles duplicate claims, or when to use it over siblings like create_idempotency. The description suffices for basic orientation but leaves major gaps.

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 50% (only 'id' has a description). The description adds some meaning by clarifying that 'operation_id' is the operation identifier being claimed, which helps interpret the empty schema description. However, it does not elaborate on parameter formats or constraints, so the compensation is partial.

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 clearly states the tool's function: to claim an operation id exactly once, acting as an idempotency firewall. It uses a specific verb ('claim') and resource ('operation id'), and distinguishes it from related siblings like create_idempotency by emphasizing the 'exactly once across runs' behavior.

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 provides clear contextual guidance: this tool is used to ensure idempotency when claiming an operation id across runs. It implies the scenario of preventing duplicate processing, though it does not explicitly name alternatives or exclusionary cases. The 'across runs' phrase sets clear usage context.

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