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CC3-0

CoinCap MCP Server

by CC3-0

assets_slug_markets

Retrieve market details for any cryptocurrency asset using its unique slug identifier. Supports pagination with limit and offset parameters.

Instructions

Retrieve markets for a specific asset

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
slugYesThe slug of the asset
limitNoNumber of results to return (default is 100)
offsetNoNumber of results to skip (default is 0)
Behavior3/5

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

No annotations are provided, so the description should disclose behavioral traits. It is a simple retrieval with no mention of side effects, rate limits, or authentication. While adequate for a read operation, it lacks detail on pagination or response behavior, leaving some ambiguity.

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?

The description is a single, concise sentence that immediately communicates the tool's purpose. No unnecessary words, but it could benefit from slightly more detail without losing conciseness.

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?

With no output schema, the description should explain the return format or structure. It fails to do so, leaving the agent uncertain about what the response contains. For a simple list tool, this gap reduces completeness.

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 baseline is 3. The description adds no additional meaning beyond the schema; it does not elaborate on the 'slug', 'limit', or 'offset' parameters.

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 'Retrieve markets for a specific asset' clearly states the verb 'Retrieve' and the resource 'markets for a specific asset', using the slug to identify the asset. This distinguishes it from sibling tools like 'assets_slug' (likely returns asset details) and 'markets' (likely returns all markets).

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?

The description implies usage when a specific asset's markets are needed, but it does not explicitly state when to use this tool over alternatives like 'markets' or provide any exclusion criteria. Context is clear but guidance is minimal.

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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