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32n1

EVE Online Companion MCP Server

by 32n1

eve_market_price

Check current EVE Online market prices for items across regions. Get Jita buy/sell data or specify other regions to monitor market values.

Instructions

Get current market price for an item. Shows Jita buy/sell by default, can specify other regions.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
item_nameYesItem name
regionNoRegion name (default: The Forge / Jita)
Behavior2/5

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

No annotations are provided, so the description carries the full burden. It mentions default behavior (Jita region) and flexibility (other regions), but lacks details on rate limits, authentication needs, error handling, or what 'current' means (e.g., real-time vs. cached). This is a significant gap for a tool with no annotation coverage.

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?

The description is appropriately sized and front-loaded, with two concise sentences that efficiently convey the tool's purpose and key usage details without any wasted words.

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?

Given the tool's moderate complexity (2 parameters, no output schema, no annotations), the description is adequate but incomplete. It covers the basic purpose and default behavior but lacks details on authentication, rate limits, return format (e.g., buy/sell prices as numbers or objects), or error cases, which are important for a market price tool.

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 description coverage is 100%, so the schema already documents both parameters. The description adds marginal value by clarifying the default region ('Jita') and that other regions can be specified, but does not provide additional syntax, format details, or examples beyond what the schema provides.

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's purpose with specific verbs ('Get current market price') and resource ('for an item'), and distinguishes it from sibling tools like 'eve_market_orders' by focusing on price retrieval rather than order listing.

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?

The description provides clear context for usage ('Shows Jita buy/sell by default, can specify other regions'), but does not explicitly state when to use alternatives like 'eve_market_appraise' or 'eve_market_orders', nor does it mention exclusions or prerequisites.

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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