Documentation: how to obtain CURSOR_BACKEND_BASE_URL, CURSOR_CHAT_ENDPOINT, and CURSOR_LOCAL_AGENT_ENDPOINT values

[misak113]

Problem

The project requires three environment secrets for deployment:

• CURSOR_BACKEND_BASE_URL
• CURSOR_CHAT_ENDPOINT
• CURSOR_LOCAL_AGENT_ENDPOINT

However, the correct values are not documented anywhere. The .env.example and README.md contain only placeholders like "private-cursor-backend-origin" and "private-cursor-chat-endpoint". The AGENTS.md explicitly prohibits committing them, and the values have never appeared in the git history.

What we tried

1. Searched the codebase — no hardcoded values, only env var references.
2. Inspected @cursor/sdk — found https://api2.cursor.sh as default backend and agent.v1.AgentService proto definitions, but these don't match the chat endpoint.
3. mitmproxy on macOS — Cursor's chat streaming uses native HTTP/2 connections that bypass HTTPS_PROXY. Only metadata RPCs were captured (GetTeams, AvailableModels, etc.).
4. Searched Cursor's bundled JS files — the chat endpoint path is constructed dynamically at runtime, not present as a string literal.
5. Wireshark with SSLKEYLOGFILE — Cursor's native process doesn't respect it, so TLS decryption failed.

Result

Setting CURSOR_BACKEND_BASE_URL=https://api2.cursor.sh and guessing the chat endpoint path results in:

parse binary: illegal tag: field no 0 wire type 0

This confirms the guessed path returns non-protobuf content.

Request

Could you please document how self-hosters can obtain the correct values for these three secrets? Even a pointer in the right direction would be very helpful.

Thank you for this great project!

[misak113]

I found a way to get the values. It took a lot of time and tokens :)
For the record, here are my settings gathered from Cursor.
Also, I had to make a few changes to the code to make it work. Do you want to share the changes as a PR here?

CURSOR_BACKEND_BASE_URL=https://api2.cursor.sh
CURSOR_CHAT_ENDPOINT=/aiserver.v1.AiService/StreamChat
CURSOR_LOCAL_AGENT_ENDPOINT=/agent.v1.AgentService/Run