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CC3-0

CoinCap MCP Server

by CC3-0

agentFriendly_ta_slug_ema

Calculates the Exponential Moving Average (EMA) for a given cryptocurrency asset over a specified period and timeframe to identify price trends.

Instructions

Get Exponential Moving Average for trend analysis

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
slugYesAsset slug (e.g., bitcoin)
periodNoEMA period
fetchIntervalNoTimeframe for price bars
Behavior2/5

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

No annotations are provided, so the description must carry the full burden. It only states 'Get Exponential Moving Average', but does not disclose whether it returns a single value or series, any authentication needs, rate limits, or other behavioral traits.

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 concise and front-loaded in a single sentence. While efficient, it could be improved by adding more context without sacrificing 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?

The tool has no output schema and the description does not explain what the return value looks like. Given the presence of sibling tools and the need to understand the output format, the description is incomplete.

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 parameters are already documented. The description adds no additional meaning beyond the schema's parameter descriptions, which are themselves minimal. Baseline 3 is appropriate.

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 clearly states the tool gets an Exponential Moving Average for trend analysis, specifying the verb and resource. However, it does not differentiate from sibling tools like agentFriendly_ta_slug_sma or agentFriendly_ta_slug_macd, which are also trend indicators.

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?

The description provides no guidance on when to use this tool versus alternatives. No context on prerequisites, when-not to use, or comparisons with other TA tools.

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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