# CleanChart (remote · www.cleanchart.app)

Clean messy tabular data and render publication-ready PNG charts from your AI assistant.

- Trust score: 67/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-04

## Components

- remote · `www.cleanchart.app`: 67/100 (this document), [markdown](https://verifymcp.io/servers/app-cleanchart-cleanchart/api-mcp.md), [page](https://verifymcp.io/servers/app-cleanchart-cleanchart/api-mcp)

## Channel facts

- Endpoint: `https://www.cleanchart.app/api/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-04.

- **Endpoint Security**: 63/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 8 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 44/100
  - 0% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 1184 tokens (~131/item across 9 items; 8 tools + 1 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 47/100
  - Stability observed for 14 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 94/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 81% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 8 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 9 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).
  - Supports UI / widget rendering.

## Install

### How do I install the CleanChart MCP server?

CleanChart is a hosted endpoint at https://www.cleanchart.app/api/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http app-cleanchart-cleanchart 'https://www.cleanchart.app/api/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "app-cleanchart-cleanchart": {
      "url": "https://www.cleanchart.app/api/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "app-cleanchart-cleanchart": {
      "type": "http",
      "url": "https://www.cleanchart.app/api/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.app-cleanchart-cleanchart]
url = "https://www.cleanchart.app/api/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "app-cleanchart-cleanchart": {
      "type": "remote",
      "url": "https://www.cleanchart.app/api/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add app-cleanchart-cleanchart --url 'https://www.cleanchart.app/api/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  app-cleanchart-cleanchart:
    url: "https://www.cleanchart.app/api/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "app-cleanchart-cleanchart": {
      "Transport": "http",
      "Url": "https://www.cleanchart.app/api/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add app-cleanchart-cleanchart -t streamable-http -u 'https://www.cleanchart.app/api/mcp'
```

### Other

```json
{
  "mcpServers": {
    "app-cleanchart-cleanchart": {
      "type": "http",
      "url": "https://www.cleanchart.app/api/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-03 (score 67, +1)

No change was recorded against any check on this day. Stability & Change Management went from 40 to 43. That category is still filling its 30-day observation window: 12 days of observed history at the previous scan, 13 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-01 (score 66, +1)

No change was recorded against any check on this day. Stability & Change Management went from 33 to 37. That category is still filling its 30-day observation window: 10 days of observed history at the previous scan, 11 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-30 (score 65, +1)

No change was recorded against any check on this day. Stability & Change Management went from 27 to 30. That category is still filling its 30-day observation window: 8 days of observed history at the previous scan, 9 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-28 (score 64, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-26 (score 63, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-23 (score 62, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-22 (score 61, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-21 (score 61)

First indexed and scored.

## MCP tools (8)

### `list_chart_types` (~60 tokens)

List chart types

List all chart types CleanChart can render, each with its default config object. Use a default config as the starting point, override what you need (title, xColumn, yColumn, colors, ...), then call validate_chart_config before generate_chart.

### `validate_chart_config` (~92 tokens)

Validate chart config

Dry-run validation of a chart config for a given chart type. Returns valid:true or a list of human-readable problems to fix. Always call this before generate_chart — it is free and instant, while a failed render costs a rate-limited attempt.

Input parameters:

- `chartType` (string, required): Chart type id from list_chart_types
- `config` (object, required): Chart config object (start from the type's defaultConfig)

### `detect_data_issues` (~112 tokens)

Detect data issues

Analyze tabular data for quality issues before charting: duplicates, missing values, whitespace, invalid tokens (N/A, -, ?), type mismatches, outliers, inconsistent date formats, and per-column inferred types. Returns a report whose findings map directly to apply_data_fixes options.

Input parameters:

- `data` (array, required): Tabular data as an array of row objects, e.g. [{"Month":"2026-01","Sales":120}, ...]. All rows should share the same keys (column names).

### `apply_data_fixes` (~206 tokens)

Apply data fixes

Clean tabular data with CleanChart's fix engine and get the cleaned rows back plus a change log. Options (all optional booleans unless noted): remove_duplicates, remove_empty_rows, remove_empty_columns, trim_whitespace, replace_invalid_values (turn N/A/-/? into null), nullify_missing, convert_types, missing_strategy ('fill_smart' fills gaps with column mean or 'Unknown'), date_standardization with date_columns (string[], converts recognized date formats to YYYY-MM-DD), strip_numeric_formatting with format_columns (string[]), strip_coded_values with coded_columns (string[]).

Input parameters:

- `data` (array, required): Tabular data as an array of row objects, e.g. [{"Month":"2026-01","Sales":120}, ...]. All rows should share the same keys (column names).
- `fixOptions` (object, required): Fix options object, e.g. {"remove_duplicates":true,"date_standardization":true,"date_columns":["Date"]}

### `generate_chart` (~307 tokens)

Generate chart

Render a publication-ready chart from tabular data and return it as a PNG image. By default the image is only delivered inline and never stored — in chat UIs the user can save it straight from the conversation. If the user needs a downloadable file (e.g. your client cannot save inline images), pass returnUrl:true: the response then also includes chartUrl, a direct link to the PNG valid for 24 hours — surface it to the user. Without an API key the free tier applies: watermark and reduced resolution — mention the upgrade info from the response to the user if they want a clean export (create_checkout provides a payment link). With a CleanChart API key (Authorization: Bearer cc_...) and an active subscription or 24h day pass, output is clean and full resolution. Call validate_chart_config first; large datasets are sampled automatically.

Input parameters:

- `chartType` (string, required): Chart type id from list_chart_types
- `config` (object, required): Validated chart config
- `data` (array, required): Tabular data as an array of row objects, e.g. [{"Month":"2026-01","Sales":120}, ...]. All rows should share the same keys (column names).
- `returnUrl` (boolean): Set true to also get chartUrl, a 24h download link to the PNG. This stores a copy of the rendered chart on CleanChart's servers for 24 hours — leave unset for the default privacy-preserving inline-on…

### `get_entitlements` (~62 tokens)

Get entitlements

Show the caller's current CleanChart tier. Anonymous callers are free tier (watermarked, reduced resolution). With an API key (Authorization: Bearer cc_..., created in the CleanChart dashboard) this reflects the account's subscription or 24h day pass.

### `create_checkout` (~162 tokens)

Create checkout

Create a payment link the USER must open in their browser — never call this without the user explicitly asking to purchase. kind 'single_chart' (pass the exact data, chartType, and config to be rendered; after payment call claim_chart to receive the clean chart), 'day_pass' (24h unlimited clean exports), or 'subscription' (monthly unlimited). day_pass and subscription are account-based: after payment CleanChart emails a sign-in link, and an API key from the dashboard unlocks clean renders over MCP.

Input parameters:

- `chartType` (string): single_chart only
- `config` (object): single_chart only: validated chart config
- `data` (array): single_chart only: the rows to render after payment
- `kind` (string, required)

### `claim_chart` (~176 tokens)

Claim purchased chart

Redeem a paid single-chart purchase (from create_checkout with kind 'single_chart') and receive the clean, full-resolution PNG. Call this after the user confirms payment. Returns payment_pending while the checkout is unpaid — wait for the user, do not poll in a loop. By default the image is only delivered inline and never stored; pass returnUrl:true if the user needs a downloadable file — the response then also includes chartUrl, a direct link to the PNG valid for 24 hours — surface it to the user.

Input parameters:

- `checkoutId` (string, required)
- `purchaseId` (string, required)
- `returnUrl` (boolean): Set true to also get chartUrl, a 24h download link to the purchased PNG. This stores a copy on CleanChart's servers for 24 hours — leave unset for inline-only delivery.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/app-cleanchart-cleanchart/api-mcp#diagnostics

## Score history

- 2026-11-04: 67
- 2026-11-03: 67
- 2026-11-02: 66
- 2026-11-01: 66
- 2026-10-31: 65
- 2026-10-30: 65
- 2026-10-29: 64
- 2026-10-28: 64
- 2026-10-27: 63
- 2026-10-26: 63
- 2026-10-25: 62
- 2026-10-24: 62
- 2026-10-23: 62
- 2026-10-22: 61
- 2026-10-21: 61

## Common questions

### What is the CleanChart MCP server?

CleanChart is an MCP server listed in the public MCP registry as app.cleanchart/cleanchart. Clean messy tabular data and render publication-ready PNG charts from your AI assistant. This page covers its hosted endpoint (https://www.cleanchart.app/api/mcp).

### Is the CleanChart MCP server safe to use?

CleanChart scores 67 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the CleanChart MCP server expose?

CleanChart exposes 8 tools: list_chart_types, validate_chart_config, detect_data_issues, apply_data_fixes, generate_chart, and 3 more. Their descriptions and schemas cost roughly 1,177 tokens of context every time the server is loaded.

### Does the CleanChart MCP server require authentication?

No. We connected to CleanChart without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the CleanChart MCP server still maintained?

CleanChart is still listed as active in the MCP registry. We last reached this channel on 4 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://www.cleanchart.app/api/mcp
- Website: https://www.cleanchart.app/mcp
- Changelog RSS feed: https://verifymcp.io/servers/app-cleanchart-cleanchart/api-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/app-cleanchart-cleanchart/api-mcp.json
- HTML version of this page: https://verifymcp.io/servers/app-cleanchart-cleanchart/api-mcp