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liukeyu800

mcp-server-chart-offline

generate_area_chart

Generate area charts to show data trends over continuous independent variables, using filled areas to represent cumulative changes and overall patterns.

Instructions

Generate a area chart to show data trends under continuous independent variables and observe the overall data trend, such as, displacement = velocity (average or instantaneous) × time: s = v × t. If the x-axis is time (t) and the y-axis is velocity (v) at each moment, an area chart allows you to observe the trend of velocity over time and infer the distance traveled by the area's size.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
dataYesData for area chart, such as, [{ time: '2018', value: 99.9 }].
stackNoWhether stacking is enabled. When enabled, area charts require a 'group' field in the data.
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.
axisYTitleNoSet the y-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 behavioral traits such as side effects, return format, or required permissions. For a chart generation tool, it fails to mention output type (e.g., image URL, HTML) or any mutation aspects.

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 paragraph that is informative but somewhat verbose with the physics example. Could be more concise. However, it is well-structured and front-loads the core purpose.

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 absence of annotations and output schema, the description lacks information about return format or side effects. For a tool with 8 parameters, it provides adequate conceptual context but misses behavioral completeness that would help the agent understand the tool's full operation.

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 has 100% description coverage, so the schema already documents all parameters. The description adds a conceptual example but no additional practical semantics beyond the schema, meeting the baseline expectations.

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 an area chart to show data trends under continuous independent variables, using a specific physics example. It effectively distinguishes from sibling tools like line and bar charts by emphasizing the area's role in inferring magnitude.

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 continuous independent variables and observing overall trends, but does not explicitly state when not to use it or compare directly to alternatives. Adequate but lacks explicit guidance on selection.

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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