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CC3-0

CoinCap MCP Server

by CC3-0

assets

Retrieve a list of cryptocurrency assets with optional search by slug or symbol, filter by IDs, and pagination.

Instructions

Retrieve a list of assets

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
searchNosearch by asset slug (bitcoin) or symbol (BTC)
idsNoComma-separated list of asset ids (e.g. bitcoin,ethereum)
limitNoNumber of results to return (default is 100)
offsetNoNumber of results to skip (default is 0)
Behavior2/5

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

With no annotations, the description must disclose behavioral traits. It only states 'Retrieve a list of assets' without mentioning pagination, default limit, or that it is a read-only operation. Critical details from the schema (e.g., default limit 100) are omitted.

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 with no wasted words. However, it is underspecified and could include a brief additional sentence to improve utility 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?

Given 4 parameters, no annotations, no output schema, and many sibling tools, the description is too minimal. It fails to explain the nature of assets listed, ordering, or how to combine parameters effectively.

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%, so baseline is 3. The description adds no additional meaning beyond the schema's parameter descriptions, such as the semantics of 'search' vs 'ids' or the effect of pagination parameters.

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

Purpose4/5

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

The description 'Retrieve a list of assets' clearly states the verb and resource, but does not differentiate from sibling tools like 'assets_slug' or 'agentFriendly_assets_search' which also retrieve asset data.

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

Usage Guidelines2/5

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

No guidance is provided on when to use this tool versus alternatives such as 'agentFriendly_assets_search' or 'assets_slug'. The description lacks context on appropriate use cases.

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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