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 file-opsgit 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/file-ops)<a href="https://agentmods.dev/skills/cardstack/boxel/file-ops"><img src="https://agentmods.dev/badge/skills/cardstack/boxel/file-ops/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/file-ops"><img src="https://agentmods.dev/badge/skills/cardstack/boxel/file-ops.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 | $0.00045 | $0.01418 |
| Opus 5.5 | $0.00018 | $0.00567 |
| Sonnet 5.5 | $0.00009 | $0.00284 |
| Haiku 4.5 | $0.00005 | $0.00142 |
Grade A, and why
file-ops 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 — 132 lines — stays where its author put it; the contents beside it link to each section on GitHub.
File operations
Wraps the boxel file subcommands that operate on a single path inside a realm. Prefer these over realm sync / realm push when only one or two files need to move.
When the user asks to...
The realm URL is always passed via --realm, the realm-relative path is positional.
| Ask | Run |
|---|---|
| "read a file from the realm" | boxel file read <path> --realm <realm-url> |
| "write / upload one file" | boxel file write <path> --realm <realm-url> (content from stdin or --file) |
| "list files in a realm" | boxel file list --realm <realm-url> |
| "delete a file from the realm" | boxel file delete <path> --realm <realm-url> |
| "lint a card definition" / "check for errors" | boxel file lint <path> --realm <realm-url> |
| "force re-index this file" | boxel file touch <path> --realm <realm-url> |
| "force re-index everything" | boxel file touch --all --realm <realm-url> (use sparingly) |
touch — when it matters
boxel file touch is the escape hatch for "the realm has the right file but wrong derived state." Common cases:
- A
.gtsdefinition was updated remotely but instances using it still show the old shape — touch one instance to force re-indexing. - A linked card was renamed and dependents haven't picked up the new path.
Touch is cheap. Reach for it when you suspect indexing didn't pick up a recent change.
lint — what it checks
boxel file lint runs the realm's lint endpoint against a file. It catches Boxel-specific issues that generic TypeScript linters miss (bad adoptsFrom paths, wrong linksTo vs contains, missing fitted format). Use it before pushing new card definitions.
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 Changed · +2 lines 7ee88432a606
- 5d ago First seen · 130 lines · 45 tokens per session scan A 7f25d74d9007
file-ops is a skill published in the GitHub repository cardstack/boxel (27 stars, last pushed today), licensed MIT. It adds 45 tokens to every session and 1,418 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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