Chart Generator Skill

Overview

For advanced users, Chart Generator supports all Chart.js dataset properties as passthrough options, giving you full control over fills, gradients, point styles, and more.

Live Test Chart Generator Skill Skill →

The tool

Once your client is connected to the VerveKit server, this appears in its tool list as ChartGeneratorSkill. It is read-only and open-world — it fetches and never mutates anything on your side — so most clients call it without asking you to confirm.

Tool call

{
  "name": "ChartGeneratorSkill",
  "arguments": {
    "labels": "[\"Q1\", \"Q2\", \"Q3\", \"Q4\"]",
    "datasets": "[{\"name\": \"Sales\", \"values\": [10, 20, 30, 40]}]"
  }
}

You do not name the tool yourself; the model picks it. Asking about ["Q1", "Q2", "Q3", "Q4"] in the terms this skill covers is enough for it to reach for ChartGeneratorSkill on its own — naming it explicitly also works, and is the way to force the call.

Connecting

One server URL covers every skill in the catalog, including this one. Authorization is OAuth: the client opens a browser once, and there is no key to paste into a config file.

{
  "mcpServers": {
    "vervekit": {
      "url": "https://api.vervekit.com/v1/mcp"
    }
  }
}

Per-client setup — Claude, Cursor, VS Code, ChatGPT — is on the MCP setup page.

Arguments

These are the properties on the tool's inputSchema, so a well-behaved client validates them before the call is made. Premium arguments are accepted on every plan but only take effect on plans that include them.

Argument	Type	Description
`type`Optional	string	Chart type `barlinepiedoughnutradarpolarArea` default bar
`labels`Required	array	Array of labels for the x-axis or chart segments
`datasets`Required	array	Array of datasets with 'name' and 'values'
`title`Optional	string	Optional title displayed on the chart
`width`OptionalPremium	integer	Image width in pixels default 500 · range 100–1024
`height`OptionalPremium	integer	Image height in pixels default 300 · range 100–1024
`format`OptionalPremium	string	Output format `pngjpegsvg` default png

What the model gets back

The result carries a structuredContent object matching the tool's declared outputSchema, so a client reads fields without parsing prose. status is "ok" and error is null on success; a null field means the value was not available for that input, not that the call failed.

Result

{
  "status": "ok",
  "error": null,
  "data": {
    "id": "6a783c9c-f959-4a88-80cb-84580b8c788d",
    "format": ".png",
    "expires": 1766010059346,
    "type": "bar",
    "downloadURL": "https://storage.googleapis.com/apiverve/APIData/chartgenerator/6a783c9c-f959-4a88-80cb-84580b8c788d.png?GoogleAccessId=635500398038-compute%40developer.gserviceaccount.com&Expires=1766010059&Signature=Iud%2B7hoPRtPbWoJXQAAnhN9nqUHObHQ7PaiJCtkWQzEzpMexPMRR3BIPKkwOUMAwT6YcNbvywgnLvU2SV7498rbp%2FZbktuAR3Ok1E3O6p4ZJJ4s%2FpW8HAZgIBJpDlPUQt%2FjulQLtwP2I2GUPVmgWheXitnWsWq1S3E2k4viysXwS8H2%2B8BBdxjS%2Bv1ruGXbqd4RpdzdLst4e9YtHGWNZuiaL8zX8%2FHA1zreyrewY2fpB4g0pHnh%2B3IDE48eIohb4HQoDc9vXy4s8sIoqLScmTLyxyq1pPYlak1n1PWdbLcz4TBr41JnLELzF%2BBwCkyrLts9dhisSseaIB7d4g4JQnw%3D%3D"
  }
}

Response fields

Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.

Field	Type	Example	Description
`id`	string	`6a783c9c-f959-4a88-80cb-84580b8c788d`	Unique identifier for the generated chart
`format`	string	`.png`	File format of the generated chart image
`expires`	number	`1766010059346`	Unix timestamp when the chart URL expires
`type`	string	`bar`	Type of chart that was generated
`downloadURL`	string	https://storage.googleapis.com/apiverve/APIData/chartgenerator/6a783c9c-f959-4a88-80cb-84580b8c788d.png?GoogleAccessId=635500398038-compute%40developer.gserviceaccount.com&Expires=1766010059&Signature=Iud%2B7hoPRtPbWoJXQAAnhN9nqUHObHQ7PaiJCtkWQzEzpMexPMRR3BIPKkwOUMAwT6YcNbvywgnLvU2SV7498rbp%2FZbktuAR3Ok1E3O6p4ZJJ4s%2FpW8HAZgIBJpDlPUQt%2FjulQLtwP2I2GUPVmgWheXitnWsWq1S3E2k4viysXwS8H2%2B8BBdxjS%2Bv1ruGXbqd4RpdzdLst4e9YtHGWNZuiaL8zX8%2FHA1zreyrewY2fpB4g0pHnh%2B3IDE48eIohb4HQoDc9vXy4s8sIoqLScmTLyxyq1pPYlak1n1PWdbLcz4TBr41JnLELzF%2BBwCkyrLts9dhisSseaIB7d4g4JQnw%3D%3D	Temporary URL to download the generated chart

Failure modes

Errors come back as tool errors carrying a sentence the model can act on, not a bare status code. Error handling covers the full list.

Status	What it means
`400` / `422`	The arguments did not validate. The message names the offending one.
`401`	The OAuth session is invalid or expired — reconnect the server.
`403`	Blocked by a key restriction or an IP allow-list. Never a bad identity.
`404`	This skill is not part of VerveKit. Check the catalog.
`429`	Out of credits, or a brief rate limit. The message tells them apart.

A call costs 10 credits each time the tool actually runs; a model that reasons about the tool without calling it costs nothing.

Use cases

Automated Email Digests: SaaS products embed rendered line or bar chart image URLs directly into weekly performance emails sent to active workspace members.
Monthly PDF Reports: When compiling monthly investor reports, fintech backend services render polar area or doughnut chart images to insert directly into downloadable document pages.
Support Dashboard Metrics: Internal admin consoles fetch generated radar chart images to show support agents an account's recent activity breakdown across multiple service tiers.
Chat Alert Previews: Send budget summary doughnut chart images directly to users inside chat applications when monthly spending thresholds trigger an alert.

Other ways to use Chart Generator Skill

Set up Chart Generator Skill on VerveKit, or reach the same source a different way. Your VerveKit account and credits work on all of them — one key, one balance.

Call it as a REST APIOne HTTPS endpoint and an x-api-key header, with SDKs for Node, Python and .NET.APIVerve →Reference →