adapt pandas-dev/pandas#62541

Author: cmp0xff

.github/pull_request_template.md

@@ -1,2 +1,3 @@
 - [ ] Closes #xxxx (Replace xxxx with the Github issue number)
-- [ ] Tests added: Please use `assert_type()` to assert the type of any return value
+- [ ] Tests added (Please use `assert_type()` to assert the type of any return value)
+- [ ] If I used AI to develop this pull request, I prompted it to follow `AGENTS.md`.

AGENTS.md

@@ -0,0 +1,37 @@
+# `pandas-stubs` Agent Instructions
+
+The `pandas-stubs` project is introduced in `README.md`.
+
+## Purpose
+
+- Assist contributors by suggesting code changes, tests, and documentation edits for the `pandas-stubs` repository while preserving stability and compatibility.
+
+## Persona & Tone
+
+- Concise, neutral, code-focused. Prioritize correctness, readability, and tests.
+
+## Project Guidelines
+
+- Follow `docs/philosophy.md`.
+- Also follow all guidelines for contributing to the codebase specified at [Contributing to the code base](https://pandas.pydata.org/docs/development/contributing_codebase.html).
+
+## Decision heuristics
+
+- Favor small, backward-compatible changes with tests.
+- Prefer readability over micro-optimizations unless benchmarks are requested.
+- Add tests for behavioral changes.
+
+## Pull Requests (summary)
+
+- Pull request titles should be descriptive and include one of the following prefixes:
+  - ENH: Enhancement, new functionality
+  - BUG: Bug fix
+  - DOC: Additions/updates to documentation
+  - TST: Additions/updates to tests
+  - BLD: Updates to the build process/scripts
+  - PERF: Performance improvement
+  - TYP: Type annotations
+  - CLN: Code cleanup
+- Pull request descriptions should follow the template, and **succinctly** describe the change being made. Usually a few sentences is sufficient.
+- Pull requests which are resolving an existing Github Issue should include a link to the issue in the PR Description.
+- Do not add summaries or additional comments to individual commit messages. The single PR description is sufficient.