yamltools

YAMLTools brings its YAML toolkit into your AI editor (Claude Code, Cursor, any MCP client).

CommunityOnlineNo sign-inGlobalFreeCan modify data

What it can do

  • Validate Yaml: Validate and lint a YAML document. Reports syntax errors with line/column, non-fatal lint warnings (tabs, implicit booleans, duplicate keys, dash-no-space) and document stats (documents
  • Convert Yaml: Convert between data formats (YAML, JSON, XML, TOML, TOON, CSV, TSV, INI, Properties, ENV). Source format is auto-detected by default; set `from` to force it.
  • Visualize Yaml: Turn YAML into a diagram. Returns Mermaid source; with an API key it also returns a public image hosted on yamltools.dev. Supports TREE (hierarchy) and FLOW (flowchart).

What data it sees

Do you need an account

No: the server works without sign-in

YAMLTools brings its YAML toolkit into your AI editor (Claude Code, Cursor, any MCP client).

Public tools (no account needed):

  • validate_yaml — syntax errors with line/column, plus lint warnings for tabs, implicit booleans and duplicate keys.
  • convert_yaml — between YAML, JSON, XML, TOML, TOON, CSV, TSV, INI, Properties and ENV, with source-format auto-detection.
  • visualize_yaml — returns Mermaid source (and a hosted image when you add an API key).

With a free API key, four more tools let the AI manage your saved diagrams: list_diagrams, get_diagram, create_diagram and update_diagram. Ask the AI to edit a diagram and it updates live in the web editor.

Learn more: https://yamltools.dev/mcp

How to connect

How to connect yamltools to Claude

The server address to paste into Claude settings:

https://yamltools--israelps.run.tools

  1. Open Claude (claude.ai or the desktop app).
  2. Go to Settings → Connectors.
  3. Click Add custom connector.
  4. Paste the server address copied below into Remote MCP server URL and click Add.
  5. In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect yamltools to ChatGPT

The server address to paste into ChatGPT settings:

https://yamltools--israelps.run.tools

  1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
  2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
  3. Open Settings → Connectors and click Create.
  4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
  5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
  6. In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect yamltools to Cursor

The server address to paste into Cursor settings:

https://yamltools--israelps.run.tools

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

  1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
  2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
  3. Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (7)

Raw names from tools/list. Only developers need these.

validate_yamlValidate and lint a YAML document. Reports syntax errors with line/column, non-fatal lint warnings (tabs, implicit booleans, duplicate keys, dash-no-space) and document stats (documents, keys, max depth, bytes).
convert_yamlConvert between data formats (YAML, JSON, XML, TOML, TOON, CSV, TSV, INI, Properties, ENV). Source format is auto-detected by default; set `from` to force it.
visualize_yamlTurn YAML into a diagram. Returns Mermaid source; with an API key it also returns a public image hosted on yamltools.dev. Supports TREE (hierarchy) and FLOW (flowchart).
list_diagramsList the authenticated user's saved diagrams (id, title, type, visibility, updatedAt). Requires a YAMLTools API key.
get_diagramFetch one of the user's diagrams by id, returning its YAML source and metadata. Requires a YAMLTools API key.
create_diagramSave a new diagram to the user's account. Returns its id and URL. May hit the free-plan limit (paywall). Requires a YAMLTools API key.
update_diagramUpdate an existing diagram of the user (source, title and/or type) and save it. Requires a YAMLTools API key.