Chart (Chart.js)
A RocketRide tool node that generates ready-to-render Chart.js v4 chart configurations from raw data, using the pipeline LLM.
What it does
Exposes a single generate_chart tool to an AI agent. The agent passes raw data (an array of objects or key-value pairs) plus an optional chart type, title, or natural-language description; the node prompts the pipeline LLM to produce a valid Chart.js v4 configuration and returns it as a ```chartjs fenced block that the chat UI renders as an interactive chart.
The tool is published as <serverName>.generate_chart, chartjs.generate_chart with the default config. The agent is instructed to place the returned string verbatim in its answer, without wrapping it in additional fences.
Key safeguards, all enforced in the node:
- Input truncation: list data is capped at 200 items and the serialized payload at 20 KB before being sent to the LLM, keeping the prompt manageable.
- JSON validation: the LLM response is parsed; invalid JSON raises an error instead of emitting a broken chart. Any stray markdown fences the LLM adds are stripped before parsing.
- Pure static JSON: the LLM is instructed to emit no JavaScript function callbacks (e.g.
tooltip.callbacks.label). Values that would normally require callbacks are embedded directly in label strings (e.g."Telegraph Voyage — $215.75").
Configuration
| Field | Type | Description |
|---|---|---|
serverName | string | Default "chartjs". Namespace prefix for the tool: |
The node has no lanes.
Connections
| Channel | Required | Description |
|---|---|---|
llm | yes (min 1) | LLM used to generate the Chart.js configuration |
Connect the node to an agent via the tool invoke channel. If no LLM node is connected, generate_chart raises an error at call time.
Available tools
generate_chart
Generates a Chart.js v4 configuration from data via the pipeline LLM.
| Tool | Description |
|---|---|---|
| generate_chart | ALWAYS use this tool when the user requests a chart, graph, or visualization. Do NOT generate Chart.js configs manually, call this tool instead. It generates a ready-to-render chart from data. Required: "data" (the raw data to chart). Optional: "chart_type" (bar, line, pie, doughnut, radar, polarArea, scatter, bubble), "title" (chart title), "description" (natural language description of desired chart). Returns a ready-to-render string. Place it verbatim in the answer, do NOT wrap it in additional fences. |
Output: a ```chartjs fenced block containing the Chart.js JSON configuration (type, data with labels and datasets, and options with responsive and maintainAspectRatio set to true). The agent should place this string verbatim in the answer, the UI renders it as a chart.
Schema
| Field | Type | Description | Default |
|---|---|---|---|
tool_chartjs.serverName | string | Server name Namespace prefix for the tool: | "chartjs" |