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 ArcBlock/agent-skills --skill spacegit clone --depth 1 https://github.com/ArcBlock/agent-skillsWrote 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/arcblock/agent-skills/space)<a href="https://agentmods.dev/skills/arcblock/agent-skills/space"><img src="https://agentmods.dev/badge/skills/arcblock/agent-skills/space/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/arcblock/agent-skills/space"><img src="https://agentmods.dev/badge/skills/arcblock/agent-skills/space.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 | $0.00037 | $0.00759 |
| Opus 5.5 | $0.00015 | $0.00304 |
| Sonnet 5.5 | $0.00007 | $0.00152 |
| Haiku 4.5 | $0.00004 | $0.00076 |
Grade A, and why
space 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 1mo 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 — 82 lines — stays where its author put it; the contents beside it link to each section on GitHub.
ARC skill: space
DID Space is Arc’s durable data plane: path-addressed objects that apps can treat as the default persistence layer so they do not need a separate database plus object storage. Space is an AFS implementation optimized for that model — not “another cloud drive.”
Offline booklet only. Prefer live explain / /.knowledge after a daemon is up
(arc skill show daemon, arc skill show afs).
Prefer
arc skill list→ this booklet when the task is store / list / persist- Live paths:
arc afs explain /spaces,arc afs read /.knowledge - CLI ops:
arc space --help(verify flags; do not invent subcommands)
Product rules (do not invent ontology)
- Persist into Space (or session
/user//instanceprojections) by default. - Treat path objects as first-class app data (content objects), not side files.
- For discovery/search over those objects →
arc skill show index(/modules/index). - Do not reinvent CID/auth protocols here; reuse existing Space + AFS APIs.
Discover (daemon up)
Add --instance <name> to every arc afs call unless you are on the default
instance (arc skill show afs).
arc space --help
arc space list
arc afs ls /spaces --instance <name>
arc afs explain /spaces --instance <name>
arc afs read /.knowledge --instance <name>
# Per-space drill (DID / storage-scope directory name from ls):
arc afs ls /spaces/<scope> --instance <name>
arc afs explain /spaces/<scope> --instance <name>
Session views (when mounted): /user (caller data), /instance (instance data),
sometimes /space (caller whole Space root). Prefer explain those paths before
writing.
Claim / inspect a local folder Space
# Claim a folder as a writable DID Space (creates .did-space/ when needed)
arc space init <dir>
arc space check
arc space path <app-did> [subpath] # print AFS path for an app fragment
arc space tree <app-did> # file tree (--scope instance|user)
arc space init / list / check / tree / path are the offline-safe CRUD
surface. Confirm exact flags with --help.
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.
- 1mo ago First seen · 82 lines · 37 tokens per session scan A 78b35b04703f
space is a skill published in the GitHub repository ArcBlock/agent-skills (5 stars, last pushed 9d ago), licensed MIT. It adds 37 tokens to every session and 759 once invoked, about $0.0001 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 2026-09-14.
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