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liukeyu800

mcp-server-chart-offline

generate_dual_axes_chart

Create a dual axes chart combining bar and line to display both data trends and comparisons over categories.

Instructions

Generate a dual axes chart which is a combination chart that integrates two different chart types, typically combining a bar chart with a line chart to display both the trend and comparison of data, such as, the trend of sales and profit over time.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
categoriesYesCategories for dual axes chart, such as, ['2015', '2016', '2017'].
seriesYes
themeNoSet the theme for the chart, optional, default is 'default'.default
widthNoSet the width of chart, default is 600.
heightNoSet the height of chart, default is 400.
titleNoSet the title of chart.
axisXTitleNoSet the x-axis title of chart.
Behavior2/5

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

No annotations are provided, and the description does not disclose any behavioral traits beyond generating the chart, such as return format, data constraints, or side effects. This leaves the agent without critical operational context.

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 sentence that directly states the tool's purpose. It is relatively concise, though it could be slightly more structured by separating the definition from the example usage.

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 (7 parameters, no output schema, no annotations), the description lacks guidance on when to use this specific chart type over siblings, and does not explain the relationship between series and axes. It meets minimum completeness but has gaps.

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 high (86%), so the description adds only marginal value beyond the schema, such as explaining the dual-axis concept. It does not deepen understanding of parameter interdependencies or provide usage examples beyond what schema descriptions already offer.

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 generates a dual axes chart, which is a combination chart integrating two types, typically bar and line, to display trend and comparison. This effectively distinguishes it from siblings that produce single chart types.

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 for displaying both trend and comparison simultaneously, but it does not explicitly state when to use this tool versus alternatives like separate bar or line charts, nor provides when-not or exclusion criteria.

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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