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 OutlineDriven/outline-driven-development --skill containers-internalsgit clone --depth 1 https://github.com/OutlineDriven/outline-driven-developmentWrote 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/outlinedriven/outline-driven-development/containers-internals)<a href="https://agentmods.dev/skills/outlinedriven/outline-driven-development/containers-internals"><img src="https://agentmods.dev/badge/skills/outlinedriven/outline-driven-development/containers-internals/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/outlinedriven/outline-driven-development/containers-internals"><img src="https://agentmods.dev/badge/skills/outlinedriven/outline-driven-development/containers-internals.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 3 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 29 Potential security issue detected. Manual review is recommended.Fix: Review the flagged content for security risks. Ensure no credentials, secrets, or sensitive data are exposed.
- high Privilege Escalation · line 30 Potential security issue detected. Manual review is recommended.Fix: Review the flagged content for security risks. Ensure no credentials, secrets, or sensitive data are exposed.
- medium MCP Rug Pull · line 136 Docker image references without a specific tag (:latest is implicit) or digest (@sha256:...) can be silently replaced by a malicious image.Fix: Pin the image: image:tag or image@sha256:abc123
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 | $0.00052 | $0.02095 |
| Opus 5 | $0.00026 | $0.01047 |
| Sonnet 5 | $0.00010 | $0.00419 |
| Haiku 4.5 | $0.00005 | $0.00210 |
Grade A, and why
containers-internals 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 — 156 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Containers internals
Contract
| Field | Bound contract |
|---|---|
| Trigger | A container's isolation or resource limit needs explaining or debugging, a seccomp profile needs writing, a minimal container is being built without a daemon, or an escape vector needs assessing. |
| Authority | Reversible local. The write set is namespaces and cgroups created for the session under /sys/fs/cgroup, overlay mounts on user-named directories, an OCI bundle directory, and seccomp filters applied to processes the skill starts. Rollback is stopping those processes, unmounting, and removing the cgroup directory. Most steps need root or a user namespace. No remote mutation. |
| Side effect | Kernel namespaces, cgroups, and mounts exist while the experiment runs. |
| Done | The isolation or limit in question is reproduced with the raw primitive, the observed behavior matches the explanation, and every created object has its teardown recorded. |
Inputs
- Question or symptom (required): an OOM kill, CPU throttling, a permission denial inside the container, a mount failure, or a concept.
- Target (optional): a running container's PID, or a rootfs directory for a manual container.
- Privilege (required to know): root, or an unprivileged user relying on user namespaces. Several steps differ.
Procedure
- Read and enter namespaces. Each namespace type isolates one resource. Done when: the target process's namespace inodes are listed and, when needed, a shell runs inside them.
ls -la /proc/self/ns/ # one link per namespace type
readlink /proc/1234/ns/net # compare inodes to see who shares a namespace
nsenter -t <pid> -m -u -i -n -p bash
unshare --fork --mount-proc --pid --net --uts --ipc bash # a manual container shell
| Flag | Isolates |
|---|---|
CLONE_NEWNS |
Mount table |
CLONE_NEWPID |
Process ids |
CLONE_NEWNET |
Network stack |
CLONE_NEWUTS |
Hostname and domain name |
CLONE_NEWIPC |
System V IPC and POSIX message queues |
CLONE_NEWUSER |
Uid and gid mappings |
CLONE_NEWCGROUP |
The cgroup root the process sees |
CLONE_NEWTIME |
Boot-time and monotonic clock offsets |
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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 First seen · 156 lines · 52 tokens per session scan A 32ceb6b7165f
containers-internals is a skill published in the GitHub repository OutlineDriven/outline-driven-development (52 stars, last pushed 3d ago), licensed Apache-2.0. It adds 52 tokens to every session and 2,095 once invoked, about $0.0003 per session on Opus 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 2026-09-06.
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