Add AGENTS.md

Author: akegaviar

AGENTS.md

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+# AGENTS Guidelines for This Repository
+
+This repository contains Chainbench, a blockchain infrastructure benchmarking tool built on Locust. When working on the project interactively with an agent (e.g. the Codex CLI) please follow the guidelines below for efficient development and testing.
+
+## 1. Use Headless Mode for Development Testing
+
+* **Always use headless mode** with short test durations during development.
+* **Start with minimal load** (few users, low spawn rate) to validate changes.
+* **Do _not_ run long-duration tests** during agent development sessions.
+* **Use `--autoquit`** flag to ensure tests terminate properly.
+
+Example test command:
+```bash
+poetry run chainbench start --profile evm.light --users 5 --workers 1 --test-time 30s --target https://test-node --headless --autoquit
+```
+
+## 2. Keep Dependencies in Sync
+
+If you add or update dependencies:
+
+1. Use Poetry to manage dependencies: `poetry add <package>` or `poetry add --group dev <package>`.
+2. Run `poetry lock --no-update` to update the lock file.
+3. Install updated dependencies with `poetry install`.
+4. Verify compatibility with Python 3.10+ as specified in the project.
+
+## 3. Coding Conventions
+
+* Follow Black formatting (120 character line length).
+* Use isort for import sorting (Black-compatible profile).
+* Follow Flake8 linting rules (E203 ignored for Black compatibility).
+* Use type hints where appropriate.
+* Keep MyPy checks passing.
+
+## 4. Code Quality Checks
+
+Before completing any task, run these quality checks:
+
+| Command                  | Purpose                                    |
+| ------------------------ | ------------------------------------------ |
+| `poetry run black .`     | Format code to project standards          |
+| `poetry run isort .`     | Sort imports                               |
+| `poetry run flake8`      | Run linting checks                        |
+| `poetry run mypy .`      | Run type checking                         |
+
+Or use pre-commit hooks:
+```bash
+poetry run pre-commit run --all-files
+```
+
+## 5. Testing Guidelines
+
+Test changes progressively:
+
+1. **Unit testing**: Test individual user classes and methods
+2. **Profile validation**: Verify profiles load correctly
+   ```bash
+   poetry run chainbench list profiles
+   ```
+3. **Short headless tests**: Run brief tests with minimal load
+4. **Method discovery**: Test endpoint compatibility
+   ```bash
+   poetry run chainbench discover https://test-node --clients geth
+   ```
+
+## 6. Profile Development
+
+When creating or modifying profiles:
+
+* Place custom profiles in appropriate subdirectories.
+* Follow existing profile structure and conventions.
+* Include docstrings explaining profile purpose.
+* Test with small data sizes first (`--size XS`).
+* Validate against multiple node types when applicable.
+
+## 7. Working with Test Data
+
+* Start with smallest data size (`--size XS`) for development.
+* Use `--use-latest-blocks` for nodes with limited history.
+* Consider using `--ref-url` for test data generation from a reference node.
+* Monitor memory usage with larger data sizes.
+
+## 8. Development Workflow
+
+1. Make changes to source code
+2. Run formatting: `poetry run black . && poetry run isort .`
+3. Run linting: `poetry run flake8`
+4. Run type checking: `poetry run mypy .`
+5. Test with minimal profile first
+6. Gradually increase complexity and load
+
+## 9. Useful Commands Recap
+
+| Command                                           | Purpose                               |
+| ------------------------------------------------- | ------------------------------------- |
+| `poetry install`                                  | Install all dependencies              |
+| `poetry run chainbench --help`                   | Show all available commands           |
+| `poetry run chainbench list methods`             | List supported RPC methods            |
+| `poetry run chainbench list profiles`            | List available profiles               |
+| `poetry run chainbench list shapes`              | List load pattern shapes              |
+| `poetry run chainbench discover <url>`           | Discover available methods            |
+
+## 10. Safety Reminders
+
+* **Test against test/dev nodes first** before production nodes.
+* **Monitor target node health** during benchmarks.
+* **Use appropriate rate limits** to avoid overwhelming nodes.
+* **Start with light profiles** before heavy ones.
+* **Keep test durations short** during development.
+
+---
+
+Following these practices ensures reliable development, prevents overwhelming blockchain nodes, and maintains code quality. Always prioritize controlled testing and gradual load increases when benchmarking infrastructure.