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 skills add bex-co/bex --skill bex-domainsgit clone --depth 1 https://github.com/bex-co/bexWrote 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/skills/bex-co/bex/bex-domains)<a href="https://agentmods.dev/skills/bex-co/bex/bex-domains"><img src="https://agentmods.dev/badge/skills/bex-co/bex/bex-domains/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/skills/bex-co/bex/bex-domains"><img src="https://agentmods.dev/badge/skills/bex-co/bex/bex-domains.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 | $0.00105 | $0.01212 |
| Opus 5.5 | $0.00042 | $0.00485 |
| Sonnet 5.5 | $0.00021 | $0.00242 |
| Haiku 4.5 | $0.00011 | $0.00121 |
Grade A, and why
bex-domains 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.
How it starts
The opening of the file, as written. The whole thing — 135 lines — stays where its author put it; the contents beside it link to each section on GitHub.
bex Custom Domains
bex automatically provisions and renews TLS certificates (via Let's Encrypt and Google Trust Services) for all custom domains. All HTTP traffic is redirected to HTTPS. Custom domains work on web services and static sites only.
When to Use
- Adding a custom domain to a web service or static site
- Configuring DNS records (CNAME, A, or ALIAS) with a provider
- Troubleshooting certificate issuance or domain verification failures
- Choosing between apex (
example.com) and www (www.example.com) - Disabling the
onbex.cosubdomain after adding a custom domain
Domain Limits and Cost
Workspace plans include a limited number of custom domains. Adding domains beyond the included allowance incurs an additional cost. Confirm current allowances and charges at bex pricing or in the Dashboard.
Setup Steps
1. Add domain in Dashboard
- Go to your service's Settings > Custom Domains
- Click + Add Custom Domain
- Enter your domain (e.g.
app.example.com) - Click Save
Adding a www subdomain automatically adds the root domain (and vice versa) with a redirect between them.
2. Configure DNS
Add a DNS record with your provider pointing to your bex service:
| Domain type | Record type | Name | Value |
|---|---|---|---|
Subdomain (app.example.com) |
CNAME | app |
<service>.onbex.co |
Apex (example.com) on Cloudflare |
CNAME (flattened) | @ |
<service>.onbex.co |
| Apex on other providers | A | @ |
Use bex-provided IP (see Dashboard) |
Important: Remove any AAAA (IPv6) records for your domain. bex uses IPv4, and stale AAAA records cause unexpected behavior.
Provider-specific guides:
3. Verify domain
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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 · 135 lines · 105 tokens per session scan A c12c4901d562
bex-domains is a skill published in the GitHub repository bex-co/bex (577 stars, last pushed today), licensed Apache-2.0. It adds 105 tokens to every session and 1,212 once invoked, about $0.0004 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 2026-10-29.
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