Set up Cursor Cloud dev environment for CPython

[methane]

Summary

Sets up the development environment for this CPython checkout and documents non-obvious startup/run caveats for future Cloud agents.

This repo is the CPython interpreter (3.15.0a8+) — there are no runtime services/databases. "Running the app" = building ./python; "end-to-end testing" = running the Lib/test/ regression suite.

Changes

• Add AGENTS.md with a ## Cursor Cloud specific instructions section (build flags, output location, expected missing _decimal, test/lint commands, system dep list).

Environment setup (via update script, not committed to repo)

./configure --config-cache --with-pydebug
make -s -j$(nproc)
python3 -m pip install --user --quiet "ruff==0.15.7"

System build deps (libssl-dev, libsqlite3-dev, libffi-dev, zlib1g-dev, etc.) were installed into the VM once.

Testing

• ✅ ./configure --config-cache --with-pydebug — configured (all optional modules detected except _decimal)
• ✅ make -s -j$(nproc) — built ./python (Python 3.15.0a8+)
• ✅ ./python -m test -j4 test_grammar test_builtin test_os test_sqlite3 test_hashlib test_json — 7 tests OK, 1,597 subtests
• ✅ ruff check Lib/test/test_json — All checks passed
• ✅ hello-world exercising hashlib/zlib/ssl/sqlite3 against the freshly built interpreter

hello_world_output.log

_{To show artifacts inline, enable in settings.}

  

[coderabbitai]

Important

Review skipped

Draft detected.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: e85a656f-765a-466b-8226-bc76c188ff9c

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch cursor/setup-dev-environment-b63c

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}