Space Agent is a browser-based agent workspace that can build pages, tools, widgets, and workflows directly into the running interface. It is for users who want an extensible personal or collaborative assistant whose capabilities can grow through modular pieces and text-based skills. Catalogue add-ons extend the agent's skills and workflows.
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 agent0ai/space-agent --skill backend-referencegit clone --depth 1 https://github.com/agent0ai/space-agentWrote 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/agent0ai/space-agent/backend-reference)<a href="https://agentmods.dev/skills/agent0ai/space-agent/backend-reference"><img src="https://agentmods.dev/badge/skills/agent0ai/space-agent/backend-reference/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/agent0ai/space-agent/backend-reference"><img src="https://agentmods.dev/badge/skills/agent0ai/space-agent/backend-reference.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Privilege Escalation · line 49 Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
- high Privilege Escalation · line 67 Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
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 | $0.00029 | $0.01470 |
| Opus 5.5 | $0.00012 | $0.00588 |
| Sonnet 5.5 | $0.00006 | $0.00294 |
| Haiku 4.5 | $0.00003 | $0.00147 |
Grade A, and why
Backend Reference 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- Backend Reference — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 84 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Use this skill when frontend work depends on understanding backend behavior. This skill is read-only context, not authorization to change backend files.
Hard Boundary
- Do not edit
server/,commands/, orpackaging/from this skill set. - If the task truly requires backend changes, stop and ask instead of treating this skill as permission.
- Backend changes are non-standard in this project. Only ask for them when frontend-only work cannot safely enforce security, integrity, cross-user isolation, or runtime stability.
- When you ask, explain why the frontend solution would be insufficient and describe the narrow backend change required.
Page And Request Flow
Current request order is:
- API preflight handling
/api/proxy/api/<endpoint>/mod/.../~/...and/L0/...,/L1/...,/L2/...- page shells and page actions
The browser app mounts through page shells in server/pages/. /login is public. / and /admin require authentication.
API Families
Important frontend-facing endpoint families are:
- app files:
file_list,file_paths,file_read,file_write,file_delete,file_copy,file_move,file_info,folder_download - local history:
git_history_list,git_history_diff,git_history_preview,git_history_rollback,git_history_revert - modules:
module_list,module_info,module_install,module_remove - runtime and identity:
extensions_load,password_generate,password_change,user_crypto_session_key,user_self_info
These endpoints are thin wrappers over shared helpers in server/lib/customware/ and server/lib/auth/.
file_write still defaults to whole-file replacement, but it also supports operation: "append", "prepend", and "insert". Insert writes accept exactly one anchor through line, before, or after, use the first literal before or after match, treat line as a 1-based insertion point, and require utf8.
file_list and file_paths support access: "write" or writableOnly: true for writable-only discovery. They also support gitRepositories: true; with a pattern such as **/.git/, file_paths returns local-history owner roots like L1/team/ and L2/alice/ without exposing reserved .git metadata paths.
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 · 84 lines · 29 tokens per session scan A 0137fc83f230
Backend Reference is a skill published in the GitHub repository agent0ai/space-agent (1,411 stars, last pushed 4mo ago), licensed MIT. It adds 29 tokens to every session and 1,470 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 2026-08-30.
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