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CC3-0

CoinCap MCP Server

by CC3-0

ta_slug_vwap_latest

Get the 24-hour volume weighted average price for any cryptocurrency asset. Input an asset slug to retrieve the VWAP data.

Instructions

24h VWAP (latest)

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
slugYesAsset slug (e.g. bitcoin)
Behavior2/5

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

The description lacks any behavioral details beyond the basic purpose. It does not mention that this is a read-only operation, potential error scenarios (e.g., invalid slug), rate limits, or authentication requirements. With no annotations provided, the description should carry the burden of transparency, and it fails to do so.

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

Conciseness3/5

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

The description is extremely concise, consisting of a single phrase. While it is front-loaded with the key information, it is too brief and omits essential details. Conciseness should not come at the expense of completeness; this description is under-specified.

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 the tool's low complexity (one parameter, no output schema), the description should at least hint at the output format or provide more context. It does not explain what the user will receive (e.g., a numeric value, a timestamp). This lack of context makes it less useful for an AI agent.

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?

The input schema already has a description for the slug parameter ('Asset slug (e.g. bitcoin)'), achieving 100% schema coverage. The tool description does not add additional meaning beyond that. Since schema coverage is high, a baseline of 3 is appropriate; no extra value is provided by the description.

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 '24h VWAP (latest)' clearly indicates the tool returns the latest 24-hour Volume Weighted Average Price for an asset. It distinguishes itself from sibling tools like ta_slug_ema_latest or ta_slug_rsi_latest by specifying the indicator (VWAP). However, it does not explicitly state the action (returns/provides), leaving a slight ambiguity.

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. For example, sibling ta_slug_allLatest likely returns all latest indicators including VWAP, but the description does not clarify when to use this specific tool instead. No when-not-to-use or alternative hints are given.

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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