estimate_cost

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

With no annotations, the description carries the full behavioral disclosure burden. It reveals the pricing source and that the bill is final, but omits whether the operation is read-only, idempotent, or requires authentication. No details about rate limits, side effects, or error behavior are provided.

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 short sentence with the core action front-loaded. The trailing clause 'your bill is final' is somewhat puzzling and may not earn its place, but overall the text wastes no words.

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, so return values need not be explained. However, for a tool with 0% schema description coverage and no annotations, the description is insufficient: it does not clarify required inputs, their meaning, or when to invoke the tool. Critical context for correct invocation is missing.

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 by explaining parameters. It says nothing about 'duration_s' or 'resolution', their units, defaults, or how they affect the estimate. The parameters remain completely undocumented.

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 ('Estimate') and resource ('cost') and clarifies the pricing basis ('published PowerTokens prices'). It does not explicitly differentiate from siblings, but the function is distinct from check_key, generate_video, and resume_video. The second clause 'your bill is final' slightly muddies the purpose but does not obscure the core action.

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?

No guidance is given on when to use this tool versus alternatives. There is no mention of prerequisites, such as whether a video must first be generated or which parameters are required. The agent must infer usage from the tool name alone.

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