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 cardstack/boxel --skill realm-syncgit clone --depth 1 https://github.com/cardstack/boxelWrote 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/cardstack/boxel/realm-sync)<a href="https://agentmods.dev/skills/cardstack/boxel/realm-sync"><img src="https://agentmods.dev/badge/skills/cardstack/boxel/realm-sync/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/cardstack/boxel/realm-sync"><img src="https://agentmods.dev/badge/skills/cardstack/boxel/realm-sync.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 | $0.00059 | $0.03071 |
| Opus 5.5 | $0.00024 | $0.01228 |
| Sonnet 5.5 | $0.00012 | $0.00614 |
| Haiku 4.5 | $0.00006 | $0.00307 |
Grade A, and why
realm-sync 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.
How it starts
The opening of the file, as written. The whole thing — 202 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Realm sync
Wraps the boxel realm subcommands that move data between a local directory and a realm on the realm server. Pick the right verb for the direction:
push— local → remote. Deploy local edits to the realm.pull— remote → local. Download a realm into a directory.sync— bidirectional. Reconcile both sides; needs a--prefer-*flag when there are conflicts.watch— remote → local, continuous. Long-running poller; pulls remote changes into the local directory as they happen. Locally-edited files are not overwritten by default — the watcher skips downloads when the local copy diverges from the sync manifest, logs a warning, and keeps polling. Pass--overwrite-localto opt back into the unconditional mirror behavior.create— provision a new realm on the realm server.remove— delete a realm and unlink it from the active profile.list— see realms the active profile can access.
When the user asks to...
| Ask | Run |
|---|---|
| "push my changes" / "deploy" | boxel realm push <local-dir> <realm-url> |
| "download a realm" / "pull it locally" | boxel realm pull <realm-url> <local-dir> |
| "sync" / "keep them in lockstep" | boxel realm sync <local-dir> <realm-url> --prefer-newest (or --prefer-local / --prefer-remote) |
| "watch the realm" / "live-mirror remote changes locally" | boxel realm watch start <realm-url> <local-dir> |
| "stop watching" / "kill the watcher" | boxel realm watch stop <local-dir> |
| "make a new realm" | boxel realm create <realm-name> <display-name> |
| "delete this realm" / "remove a realm" | boxel realm remove <realm-url> |
| "what realms do I have access to" | boxel realm list |
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 Changed · +19 lines a05ae80bddf7
- 5d ago First seen · 183 lines · 59 tokens per session scan A 219759c1c9d3
realm-sync is a skill published in the GitHub repository cardstack/boxel (27 stars, last pushed today), licensed MIT. It adds 59 tokens to every session and 3,071 once invoked, about $0.0002 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 2026-10-21.
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