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jasonwilbur

Cloud Cost MCP

by jasonwilbur

compare_egress

Read-onlyIdempotent

Compare data transfer costs across cloud providers. See how OCI's 10TB free monthly egress compares to AWS, Azure, and GCP.

Instructions

Compare data transfer/egress costs. OCI offers 10TB/month free (100x more than others)!

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
monthlyGBYesMonthly outbound data in GB
Behavior2/5

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

Annotations already provide readOnlyHint and idempotentHint. Description adds no new behavioral details (e.g., data freshness, caching, or side effects).

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

Conciseness4/5

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

Very concise, one sentence core purpose plus a promotional sentence. Could omit promotional line, but overall minimal and clear.

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

Completeness2/5

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

No output schema, so description should explain return values or comparison scope. It only mentions OCI free tier but not what the tool returns or how it compares providers.

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 a clear parameter description. Tool description does not add additional semantic meaning beyond the 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?

The description clearly states the tool compares egress costs, distinguishing it from siblings like compare_compute or compare_storage. The mention of OCI's free tier adds specific context.

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

Usage Guidelines3/5

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

No explicit guidance on when to use versus alternative comparison tools. The purpose is implied but lacks when-not or alternative recommendations.

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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