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 xiaods/k8e --skill k8e-sandboxgit clone --depth 1 https://github.com/xiaods/k8eWrote 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/xiaods/k8e/k8e-sandbox)<a href="https://agentmods.dev/skills/xiaods/k8e/k8e-sandbox"><img src="https://agentmods.dev/badge/skills/xiaods/k8e/k8e-sandbox/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/xiaods/k8e/k8e-sandbox"><img src="https://agentmods.dev/badge/skills/xiaods/k8e/k8e-sandbox.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 3 findings, up to medium
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 →
- medium Rogue Agent · line 115 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
- medium Prompt Injection · line 130 Subtle instructions detected that may alter agent decision-making or introduce hidden biases.Fix: Review content for implicit steering or bias. Ensure instructions are explicit and align with the skill's stated purpose.
- medium Rogue Agent · line 201 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
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 | $0.00188 | $0.07044 |
| Opus 5.5 | $0.00075 | $0.02818 |
| Sonnet 5.5 | $0.00038 | $0.01409 |
| Haiku 4.5 | $0.00019 | $0.00704 |
Grade B, and why
k8e-sandbox scanned grade B with 2 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 4d 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.
Subtle steeringmediumPrompt injection
Instructions that bias recommendations or shape behaviour without the user noticing.
If you only see a platform-suffixed name in the user's environment (no symlink yet), use that file directly: `./k8e-sandbox-cli-linux-amd64 status` etc. All spellings are interchangeable; never tell the user they are mis Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -sLO https://github.com/xiaods/k8e/releases/latest/download/k8e-sandbox-cli-linux-amd64 How it starts
The opening of the file, as written. The whole thing — 414 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/k8e-sandbox
Treat this as the k8e-sandbox skill command.
Invocation (same skill, different harness prefixes):
- Claude Code:
/k8e-sandbox <goal> - Codex:
$k8e-sandbox <goal>(or pick from/skills) - Pi:
/skill:k8e-sandbox <goal>(or/k8e-sandboxwhen skill commands are enabled) - dsh (DeepSeek Harness): the model loads this skill via the
skilltool (catalog namek8e-sandbox), or the user names it directly in chat — see dsh execution path below
Goal from invocation arguments:
$ARGUMENTS
If $ARGUMENTS is empty and no goal is otherwise provided, ask the user for a sandbox goal and stop (do not invent work).
What this skill can do (capability map)
Match the goal to a capability, then use the matching command. Exact flags live in the command reference.
| Goal shape | Capability | Command |
|---|---|---|
| Run a command, script or test suite | Isolated exec in the pod — bash (default), python, node, ts |
run, run --lang python, run --raw |
| Install dependencies | pip/npm writes land in /workspace, not the image (KIP-13) |
run 'pip install …' |
| Move files in / out | Chunked streaming — constant memory, binary-safe, any size | push <sid> <local> [remote], pull <sid> <remote> [local] |
| Keep state across calls | Auto session, --tenant for cross-process reuse, sub-agents share one pod + workspace |
run …, run --tenant, subagent <parent-sid> |
| Seed a workspace | Declarative manifest or a git clone at session creation (KIP-9) | create --manifest, create --git-repo |
| Save / restore a workspace | Content-addressed snapshots (deduped; incremental via --base) |
snapshot save/list/restore/delete |
| Serve a web app or API | Publish an in-pod port through the k8e API Gateway — no port-forward, no inbound pod exposure (KIP-24) | run --background → expose <port> → exposed / unexpose |
| Reach the internet | Session egress allowlist, updatable live while the pod runs | allow-hosts --add/--remove/--clear, or --allowed-hosts at create |
| Watch or debug a run | Transcript replay, NDJSON event stream, process list, background poll | log, events, ps, poll |
| Gate an irreversible step | Human-in-the-loop approval before the action runs | confirm <sid> <action> → approve <aid> |
| Measure cold-start latency | Warm-pool benchmark | benchmark |
| Drive it from another program | Machine-readable command surface; native MCP server | catalog, mcp-serve |
| Target another cluster | mTLS client certs + named profiles; API keys with TTL (KIP-14 / KIP-17) | --profile, connect, k8e sandbox-apikey create |
| Diagnose a broken setup | Self-check with auto-fix | doctor, doctor --json, doctor --fix |
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.
- 4d ago Changed · +9 lines 7d2d54bae1ca
- 1mo ago Changed · +19 lines 1e971a4a399d
- 1mo ago Changed · +27 lines · +127 tokens per session e9605ee48ebe
- 1mo ago First seen · 359 lines · 61 tokens per session scan B aa5d88b6934f
k8e-sandbox is a skill published in the GitHub repository xiaods/k8e (510 stars, last pushed today), licensed Apache-2.0. It adds 188 tokens to every session and 7,044 once invoked, about $0.0008 per session on Opus 5.5. A static security scan graded it B with 2 findings (subtle steering, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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