2026-10-28 Linux Boat VM, real Chrome via repo Playwright, isolated app state.
main: 0c8075170152c1aa24ab1d5a9a652adeafbbf1a5
PR: 71ed7431cd3bf9cecfacfafeac28446f21fdf51a

main:
git worktree add ../main github/main
vp i
T3CODE_DEV_SEED=0 setsid nohup timeout 7000 vp run dev
[dev-runner] serverPort=16733 webPort=8693 baseDir=/home/user/main/.t3
UI: Settings > Providers > Add provider > Cursor > Sign in > Open browser
Cursor SDK external flow reached https://authenticator.cursor.sh/ and requested an email.
No Cursor account available. Original credential-save bug NOT reproduced.
UI: Cancel sign-in returned to Retry sign-in.
UI: added /home/user/t3code as a local-folder project, selected GPT-6.1-Sol.
Prompt: Reply with exactly PR24702_CODEX_OK. Do not use tools or change files.
Real Codex provider response: PR24702_CODEX_OK
Stopped main using captured process-group PID 12655.

PR exact head:
git fetch https://github.com/Onkarj012/t3code.git fix/cursor-sdk-undefined-credentials
git switch --detach FETCH_HEAD
vp i
setsid nohup timeout 6400 vp run dev --home-dir /home/user/t3code/.t3
[dev-runner] serverPort=13773 webPort=5733 baseDir=/home/user/t3code/.t3
UI: added the same real repo project and Cursor instance through the app.
UI: Cursor Sign in > waiting state > Cancel sign-in > Retry sign-in > Open browser.
Cursor SDK external flow again reached the real email sign-in page.
Credential save/load after authenticated login NOT exercised.
UI: same GPT-6.1-Sol prompt produced PR24702_CODEX_OK.
Reload: response retained.
Server restart using same isolated state: project, response and Cursor instance retained.
No mocks, fixtures, demo data, source edits, commits, or pushes.

blacksmith-check run: vp i && vp test run packages/provider-cursor/src/server/credentialStore.test.ts packages/provider-cursor/src/server/auth.test.ts
2 test files passed; 19 tests passed (9 credential-store, 10 auth).
Existing GitHub CI for exact head: all reported checks successful or skipped.

Limit: no Cursor account/session, so no end-to-end proof of this PR fix.