Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
git clone --depth 1 https://github.com/d-padmanabhan/agent-engineering-handbookWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/rules/d-padmanabhan/agent-engineering-handbook/820-open-source)<a href="https://agentmods.dev/rules/d-padmanabhan/agent-engineering-handbook/820-open-source"><img src="https://agentmods.dev/badge/rules/d-padmanabhan/agent-engineering-handbook/820-open-source/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/rules/d-padmanabhan/agent-engineering-handbook/820-open-source"><img src="https://agentmods.dev/badge/rules/d-padmanabhan/agent-engineering-handbook/820-open-source.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00016 | $0.02220 |
| Opus 5 | $0.00008 | $0.01110 |
| Sonnet 5 | $0.00003 | $0.00444 |
| Haiku 4.5 | $0.00002 | $0.00222 |
Grade A, and why
820-open-source scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 469 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Open Source Project Engineering Ruleset
Goal: Create welcoming, maintainable open source projects that encourage contributions and make it easy for others to use and contribute.
Essential Files
.github/CONTRIBUTING.md
MUST include:
- How to set up development environment
- How to run tests
- Code style and formatting guidelines
- How to submit pull requests
- How to report bugs
- Code of conduct reference
Template:
# Contributing
Thank you for your interest in contributing!
## Development Setup
1. Fork the repository
2. Clone your fork: `git clone https://github.com/your-username/project.git`
3. Install dependencies: `make init`
4. Run tests: `make test`
## Making Changes
1. Create a branch: `git checkout -b feature/your-feature`
2. Make your changes
3. Run tests: `make test`
4. Run linter: `make lint`
5. Commit using [conventional commits](https://www.conventionalcommits.org/)
6. Push and open a pull request
> [!NOTE]
> **Agents:** remote writes (push/PR creation) are default-deny and require explicit authorization (see `020-agent-audit.mdc`).
## Code Style
- Follow the existing code style
- Run `make lint` before committing
- Add tests for new features
- Update documentation as needed
## Reporting Bugs
Use GitHub Issues and include:
- Description of the bug
- Steps to reproduce
- Expected vs actual behavior
- Environment details (OS, version, etc.)
## Questions?
Open a GitHub Discussion or reach out to maintainers.
LICENSE
MUST include a license file. Common choices:
- MIT - Permissive, widely used
- Apache 2.0 - Permissive with patent grant
- GPL v3 - Copyleft, requires derivative works to be open source
- BSD 3-Clause - Permissive, similar to MIT
README.md
MUST include:
- Project description and purpose
- Quick start / installation instructions
- Basic usage examples
- Link to full documentation
- Contributing guidelines link
- License information
- Badges (build status, version, etc.)
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 5d ago First seen · 469 lines · 16 tokens per session scan A 3b160db45c46
820-open-source is a cursor rule published in the GitHub repository d-padmanabhan/agent-engineering-handbook (16 stars, last pushed 2d ago), licensed MIT. It adds 16 tokens to every session and 2,220 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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