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.
npx agentmods add instructions/saifyxpro/headlessx/agents-mdgit clone --depth 1 https://github.com/saifyxpro/HeadlessXWhat 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 | $0.05361 | $0.05361 |
| Opus 5 | $0.02681 | $0.02681 |
| Sonnet 5 | $0.01072 | $0.01072 |
| Haiku 4.5 | $0.00536 | $0.00536 |
Grade A, and why
HeadlessX AGENTS.md 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 yesterday.
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.
The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
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.
- yesterday First seen · 537 lines · 5,361 tokens per session scan A 51eee1868b5e
HeadlessX AGENTS.md is an instructions file published in the GitHub repository saifyxpro/HeadlessX (2,273 stars, last pushed 6d ago), with no licence file. It adds 5,361 tokens to every session, about $0.0268 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 2026-08-30.
Other instructions, from other repositories
obscura AGENTS.md
Instructions for h4ckf0r0day/obscura, covering agents.md, build, rendering and stealth, no rendering, with rustls or stealth and test.
mtw-e2e-runner CLAUDE.md
Instructions for fastslack/mtw-e2e-runner, covering claude.md, project overview, commands, install dependencies and scaffold e2e/ directory in a consuming project.
browser-control AGENTS.md
Instructions for keon/browser-control: Use this project as a tiny browser pipe, not an agent framework.
stealth-browser-mcp AGENTS.md
Instructions for vibheksoni/stealth-browser-mcp, covering agent instructions, start here, recommended proxy services, environment and validation.
actionbook CLAUDE.md
Instructions for actionbook/actionbook, covering claude.md, project overview, architecture, domain model hierarchy and module structure.
AutomatiQ AGENTS.md
Instructions for StoneSteel27/AutomatiQ, covering agent guidelines, background context, our partner: nodemaven, package structure and important commands.