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/j4flmao/agent-skillsWrote 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/j4flmao/agent-skills/ebpf-safety-rules)<a href="https://agentmods.dev/rules/j4flmao/agent-skills/ebpf-safety-rules"><img src="https://agentmods.dev/badge/rules/j4flmao/agent-skills/ebpf-safety-rules/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/j4flmao/agent-skills/ebpf-safety-rules"><img src="https://agentmods.dev/badge/rules/j4flmao/agent-skills/ebpf-safety-rules.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 | $0.00023 | $0.00342 |
| Opus 5.5 | $0.00009 | $0.00137 |
| Sonnet 5.5 | $0.00005 | $0.00068 |
| Haiku 4.5 | $0.00002 | $0.00034 |
Grade A, and why
ebpf-safety-rules 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 1mo 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.
What it actually says
eBPF Safety & Engineering Standards
Cursor/AI MUST follow these rules when writing eBPF (Extended Berkeley Packet Filter) code.
1. Verifier Compliance is Absolute
- Rule: All eBPF C code MUST pass the kernel Verifier.
- Action:
- Strictly avoid unbounded
fororwhileloops. Always use bounded loops (e.g.,#pragma unroll). - Explicitly bounds-check all pointer accesses. If reading from a packet in XDP, you MUST check
if (data + offset > data_end) return XDP_DROP;before accessing the memory.
- Strictly avoid unbounded
2. Modern Stack (CO-RE and libbpf)
- Rule: NEVER generate legacy BCC (BPF Compiler Collection) python scripts unless explicitly mandated by the user.
- Action: Always generate modern eBPF code using
libbpfand BPF Type Format (BTF) to guarantee Compile-Once-Run-Everywhere (CO-RE).
3. State Management (eBPF Maps)
- Rule: eBPF programs cannot use global dynamic state.
- Action: Use BPF Maps (e.g.,
BPF_MAP_TYPE_HASHorBPF_MAP_TYPE_RINGBUF) to communicate safely between the kernel context and the user-space orchestrator. PreferRINGBUFoverPERF_EVENT_ARRAYfor high-throughput event streaming.
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.
- 1mo ago First seen · 23 lines · 23 tokens per session scan A bf71ca467664
ebpf-safety-rules is a cursor rule published in the GitHub repository j4flmao/agent-skills (33 stars, last pushed 10d ago), licensed MIT. It adds 23 tokens to every session and 342 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-09-05.
Other cursor rules, from other repositories
api-property-optionality-hygiene
Fix ApiProperty/ApiPropertyOptional optionality mismatches in DTO files; use for scheduled batch fixes or DTO edits.
python
Python best practices and patterns for modern software development with Flask and SQLite.
cursor
You are working on the checkout service. Preserve transaction integrity and auditability.
django
Definitive guidelines for writing maintainable, performant, and secure Django applications, emphasizing modern best practices, clear code organization, and efficient patterns.
shared-libraries
Shared libraries - condition framework, inventory containers, file-backed DB, itinerary, references.
selectools-providers
Rules for working with LLM provider adapters in selectools.