Borrowing it
Nothing to install: this file belongs to nirholas/XActions. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/nirholas/XActions/main/xspace-agents/.github/instructions/browser-automation.instructions.mdgit clone --depth 1 https://github.com/nirholas/XActionsWrote 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/instructions/nirholas/xactions/browser-automation)<a href="https://agentmods.dev/instructions/nirholas/xactions/browser-automation"><img src="https://agentmods.dev/badge/instructions/nirholas/xactions/browser-automation.svg" alt="Measured on agentmods" 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 | $0.00327 | $0.00327 |
| Opus 5 | $0.00163 | $0.00163 |
| Sonnet 5 | $0.00065 | $0.00065 |
| Haiku 4.5 | $0.00033 | $0.00033 |
Grade A, and why
XActions browser-automation.instructions.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 3d 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
Browser Automation (packages/core/src/browser/)
Self-Healing Selectors
The SelectorEngine in selector-engine.ts tries multiple strategies in order:
- CSS selector
- Text content match
- ARIA attribute match
Selector definitions live in selectors.ts (SELECTOR_DEFINITIONS).
Rules
- Never hardcode CSS selectors — always add them to
SELECTOR_DEFINITIONSwith multiple fallback strategies - When X's DOM changes break a selector, add new alternatives rather than replacing old ones
- The admin panel can override selectors at runtime via
POST /admin/selectors/:name - Use
DOMObserver(CDP-based) for watching DOM changes, not polling
Key Files
| File | Purpose |
|---|---|
lifecycle.ts |
Launch → login → join → leave → stop lifecycle |
launcher.ts |
Puppeteer launch with stealth plugin |
auth.ts |
X login (cookie auth or form + 2FA) |
space-ui.ts |
DOM interaction: join space, request speaker, inject audio |
selector-engine.ts |
Self-healing selector resolution |
selectors.ts |
All X Space UI element selector definitions |
observer.ts |
CDP-based DOM change monitoring |
secure-cookie-store.ts |
AES-encrypted cookie persistence |
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.
- 3d ago First seen · 35 lines · 327 tokens per session scan A a1f03b7c6ae2
XActions browser-automation.instructions.md is an instructions file published in the GitHub repository nirholas/XActions (510 stars, last pushed 3d ago), licensed Apache-2.0. It adds 327 tokens to every session, about $0.0016 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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