The short answer
code_interpreter runs Python in a sandbox. ChatGPT uses that kind of tool. The xAI API uses the tool type code_interpreter for Grok. Use Calculator Tools when the formula should be a public page. MCP calls webappCreate.
The sandbox returns a result to the model. It does not register an app on this site.
What this call does
On the xAI API, code_interpreter is a built-in tool type next to web_search and x_search. The platform runs the code and can attach citations. The SDK name for a similar sandbox is code_execution.
ChatGPT's code interpreter is the same job under the name code_interpreter: execute Python, then answer in the chat. Charts and files from that run stay with the chat product.
Neither call writes index.html to a Calculator Tools account.
What Calculator Tools does
A hosted calculator is a browser page. Sliders, inputs, and results run in JavaScript on calculator.tools.
Files live in one directory. You stay the owner. Anyone with the link can open it.
Free accounts can publish 3 apps. Pro ($5.99/month) raises the limit to 25.
How to use MCP for this job
Use code_interpreter to check a number. Then publish the interaction.
Grok's API tool list does not include Calculator Tools. Add https://api.calculator.tools/mcp/ in Cursor, Claude, or ChatGPT. Sign in with Google. Click Approve.
Ask for a hosted version of the formula. The assistant calls webappCreate and webappfileCreate. Or describe it on Create.
Gemini's matching sandbox name is google:ds_python_interpreter.
Limits
Calculator Tools does not execute code_interpreter. It does not keep Python packages from those sandboxes.
Browser math is the right scope for a public tool. A long scientific script can stay in the interpreter. Check results either way.
Next step
Open Create or connect MCP. The first 3 apps are free.
Sources
Ready to publish a public app you own?
Calculator Tools