Charming

Charming is a hosted MCP server that generates, hosts, and updates interactive web apps. Connect it to any MCP-compatible AI client and ask it to build an app — you get back a live URL in seconds.

Connect

Client	Endpoint
Claude, Grok, Gemini, Perplexity	https://charm.ing/mcp
ChatGPT	https://charm.ing/mcp/chatgpt (or the Charming listing in the ChatGPT Apps directory)

OAuth with Dynamic Client Registration is automatic — clients that support it show a one-time consent screen.

For per-client paste-strings and setup steps, see usecharming.com/clients.txt.

Starter Prompt

Once Charming is connected, paste this to start a build session:

Help me figure out what to build. Look at what you know about me and suggest 2-3 apps that fit, or ask me up to 3 short questions to find an idea.

Read https://usecharming.com/start.md then help me create my first app.

MCP Tools

Charming exposes 21 tools. Connected clients discover them automatically via tools/list.

Tool	What it does
create_app	Store an agent-authored ES module plus optional UI and CSS, and render it inline. Returns the public app URL.
update_app	Edit an existing app by replacing its module/UI/styles or applying exact-string edits with optimistic-concurrency versioning.
get_app	Render an existing app inline (where the client supports it) and return its callable API operations and metadata.
get_app_source	Return the persisted module, UI, and styles for an existing app plus its current version.
list_apps	List the calling user's apps, newest first, with descriptions and capabilities.
delete_app	Delete an app's module entry. Pass purge_storage: true to also wipe stored state.
upload_asset	Store a static asset (image, PDF, dataset) so app code stays small; readable back same-origin.
rename_app	Change an app's URL slug. The old URL keeps working by redirecting.
set_remixable	Mark an app remixable so visitors get their own editable copy.
unset_remixable	Stop allowing remixes; existing remixes survive untouched.
set_starter_prompt	Set or clear the prompt prefilled in the chat host when a visitor opens a shared app.
query_app	Run a read-only backend operation inside an app module.
mutate_app	Run a mutating backend operation inside an app module without editing code.
submit_feedback	Record agent-authored feedback (bugs, enhancements, crash reports) about an app.
list_feedback	List feedback rows for the caller's apps, newest first.
set_handle	Change the signed-in user's handle (the first segment of their app URLs).
share_app	Invite another user to collaborate on an app; they accept the invite to get access.
unshare_app	Revoke a collaborator's access to an app.
list_app_shares	List active and pending share invites for one of your apps.
set_public	Make an app public: anyone with the URL can open it with no login.
unset_public	Make a public app private again; anonymous visitors can no longer open it.

Use with a coding agent

Working in Codex, Claude Code, Cursor, or another AI coding agent? Install the Charming authoring skill from skills.sh:

npx skills add tambo-labs/charming-mcp

It teaches the agent Charming's build contract and workflow. The skill itself is SKILL.md; AGENTS.md has connect and authoring instructions for any AI coding agent. Codex users can instead install the bundled Charming Codex plugin.

Cursor

Cursor reads project rules from .cursor/rules/. Drop .cursor/rules/charming.mdc into your project (or copy its body into a legacy root .cursorrules) and Cursor's agent will reach for Charming (real URL, storage, and inline rendering) whenever you ask for an app you want to keep. The rule points at the served docs; it does not duplicate the contract.

Documentation

• Agent skill: SKILL.md · coding-agent guide: AGENTS.md · Cursor rule: .cursor/rules/charming.mdc
• Full authoring guide: usecharming.com/llms-full.txt
• OpenAPI spec: charm.ing/openapi.json
• Docs: usecharming.com/docs

Publisher

Published by Tambo.