YAMLTools

Validate, convert and visualize YAML without leaving your AI assistant. Connect your account and let the AI create and edit your diagrams just by asking.

Works with Claude Code, Cursor and any client that speaks MCP over HTTP.

claude mcp add --transport http yamltools https://yamltools.dev/api/mcp/mcp

With your API key — create and edit your diagrams

claude mcp add --transport http yamltools https://yamltools.dev/api/mcp/mcp \ --header "Authorization: Bearer yt_your_key"

Run the command below. The three public tools work with no account.

Optional — add your API key to also create and edit your saved diagrams.

Tell your AI to validate, convert, visualize or edit a diagram — it picks the right tool.

Three work for anyone; four operate on your account's diagrams.

Validate and lint YAML: syntax errors with line and column, plus warnings for tabs, implicit booleans and duplicate keys.

Convert between YAML, JSON, XML, TOML, CSV, INI, Properties and more — source format auto-detected.

Turn YAML into a diagram: Mermaid source — plus a hosted image on yamltools.dev when you add an API key.

List your saved diagrams with their titles and types.

Fetch one of your diagrams, returning its YAML source.

Save a new diagram to your account from YAML.

Edit an existing diagram's source, title or type and save it.

Open a diagram in the editor and ask your assistant for changes. It updates your diagram through the MCP and the editor refreshes on its own — no copy-paste, no reloading by hand.
- 1Open one of your diagrams in the YAMLTools editor.
- 2Ask your AI for a change — "add a redis cache and a worker".
- 3Watch the diagram update in place, saved to your account.

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