get_cost_breakdown

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

With no annotations, the description carries the full behavioral burden. It usefully discloses that the output is SIMULATED, but says nothing about whether the call mutates state, what permissions it needs, whether recomputation is idempotent, or how the receipt is supplied to a tool with an empty input schema.

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?

Two short sentences, zero filler, and the core action is front-loaded with the simulated-output caveat immediately following. Every sentence earns its place.

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?

There is no output schema and no annotations, so the description must do more. Critically, it never explains how a 'simulation receipt' reaches a tool with an empty, additionalProperties-only input schema, leaving a real operational gap for the agent.

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 tool declares zero parameters and the schema is effectively empty at 100% coverage, so the baseline of 4 applies. The description adds no parameter detail, but there is nothing for it to describe.

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 ('Recompute the execution-cost breakdown') and ties it to a source artifact ('from a simulation receipt'), which pins it down well. It does not, however, distinguish itself from nearby siblings like 'fees', 'simulate', or 'verify_receipt', so the agent must infer the difference.

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 when-to-use or when-not-to-use guidance, and no sibling is named as an alternative. The phrase 'from a simulation receipt' weakly implies it follows 'simulate', but this is inference rather than stated routing.

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