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gpu_estimate

Estimate GPU compute service costs before execution to budget AI workloads across multiple providers.

Instructions

Estimate the cost of a GPU-Bridge service before running it. No authentication required.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
serviceYesService key (e.g. llm-4090, image-4090)
secondsNoEstimated runtime in seconds (optional)

Implementation Reference

  • The handler for the `gpu_estimate` tool in the switch block of the `CallToolRequestSchema` request handler.
          case "gpu_estimate": {
            const { service, seconds } = args;
            const qs = seconds ? `&seconds=${seconds}` : "";
            const est = await apiCall(`/catalog/estimate?service=${service}${qs}`, "GET");
            if (est.error) {
              return { content: [{ type: "text", text: `Error: ${est.error}${est.available_services ? `
    Available: ${est.available_services.join(", ")}` : ""}` }], isError: true };
            }
            return { content: [{ type: "text", text: `Service: ${est.service}
    Estimated cost: $${est.estimated_cost_usd}
    Rate: $${est.price_per_second}/sec
    ${est.note}` }] };
          }
  • index.js:62-72 (registration)
    Registration of the `gpu_estimate` tool within the `ListToolsRequestSchema` handler.
      name: "gpu_estimate",
      description: "Estimate the cost of a GPU-Bridge service before running it. No authentication required.",
      inputSchema: {
        type: "object",
        properties: {
          service: { type: "string", description: "Service key (e.g. llm-4090, image-4090)" },
          seconds: { type: "number", description: "Estimated runtime in seconds (optional)" }
        },
        required: ["service"]
      }
    }
Behavior3/5

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

No annotations provided, so description carries full disclosure burden. It successfully adds the authentication requirement (no auth needed) which annotations would typically cover. However, missing: idempotency, rate limits, what the estimate returns (format/currency), and error behaviors for invalid service keys.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences, zero waste. First establishes purpose and timing relative to execution; second states auth requirement. Every word earns its place. Well front-loaded with action verb leading.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Tool has simple 2-parameter schema with full coverage, but no output schema exists. Description fails to specify what the estimate returns (numeric value? object? currency units?). Given no annotations and no output schema, the description should have disclosed return format. Adequate but with clear gaps.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100% with clear descriptions and examples (e.g., 'llm-4090'). Description does not need to repeat parameter definitions per calibration guidelines. Baseline 3 is appropriate as description adds no parameter syntax beyond schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Description uses specific verb 'Estimate' with resource 'cost' and scope 'GPU-Bridge service'. The phrase 'before running it' clearly distinguishes this from sibling gpu_run, implying this is a pre-flight check.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

States 'before running it' implying workflow order (use this prior to gpu_run). Explicitly notes 'No authentication required' which is a critical usage constraint. However, does not explicitly name gpu_run as the alternative or describe when NOT to use it (e.g., when you need actual execution).

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

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