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 vinnie357/claude-skills --skill agent-substrate-overviewgit clone --depth 1 https://github.com/vinnie357/claude-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/vinnie357/claude-skills/agent-substrate-overview)<a href="https://agentmods.dev/skills/vinnie357/claude-skills/agent-substrate-overview"><img src="https://agentmods.dev/badge/skills/vinnie357/claude-skills/agent-substrate-overview/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/vinnie357/claude-skills/agent-substrate-overview"><img src="https://agentmods.dev/badge/skills/vinnie357/claude-skills/agent-substrate-overview.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00087 | $0.02058 |
| Opus 5 | $0.00044 | $0.01029 |
| Sonnet 5 | $0.00017 | $0.00412 |
| Haiku 4.5 | $0.00009 | $0.00206 |
Grade A, and why
agent-substrate-overview 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 6d 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 — 144 lines — stays where its author put it; the contents beside it link to each section on GitHub.
agent-substrate-overview
Agent Substrate is an Apache-2.0 Kubernetes runtime for agent-like workloads that multiplexes many stateful actors onto fewer worker pods, preserving in-memory + disk state via gVisor checkpoint/restore. It is explicitly alpha (v0.0.0, README quote: "VERY early development… APIs are almost guaranteed to change"). This skill is a short reference so you can evaluate it against k8s-agent-sandbox, not an operational guide.
If the operational decision is already "use Substrate," read the upstream README directly — this skill is intentionally not a step-by-step install guide because Substrate is at v0.0.0 with API churn between commits, so pinning a recipe here would go stale.
What Substrate is
From the upstream README: "Agent substrate is a system built on top of Kubernetes which manages agent-like workloads to achieve higher scale and efficiency than Kubernetes alone can offer, with lower latency."
Architectural diff vs kubernetes-sigs/agent-sandbox:
agent-sandbox (kubernetes-sigs) |
agent-substrate |
|
|---|---|---|
| Maturity | v0.4.6 (released) | v0.0.0 (alpha) |
| Control plane | k8s controller + CRDs only | k8s controller + dedicated gRPC ateapi |
| Workload model | One sandbox per claim | Many actors multiplexed onto fewer pods |
| Suspend/resume | Pod snapshots (GKE feature) | gVisor runsc checkpoint/restore first-class |
| CLI | kubectl + Python SDK |
kubectl-ate plugin |
| Use case | per-session ephemeral agents | high-density actor swarms |
Per Google's 2026-05-20 blog: "Substrate is the open-source ultra-scale tier sharing Sandbox's core secure runtime and snapshotting capabilities with a minimal control plane designed to bypass some of the limitations of Kubernetes for millions of sub-second tool calls."
Components
ateapi— gRPC control plane.atelet— node-level DaemonSet supervising workers and snapshots.atecontroller— k8s controller reconciling Substrate CRDs.atenet— networking controller: DNS, Envoy routing, proxy sidecars.ateom-gvisor— interior helper runningrunsc checkpoint/restore.podcertcontroller— Pod Certificate signer polyfill.kubectl-ate— operator CLI plugin.
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.
- 6d ago First seen · 144 lines · 87 tokens per session scan A f5f63fdfeb6d
agent-substrate-overview is a skill published in the GitHub repository vinnie357/claude-skills (25 stars, last pushed 3d ago), licensed MIT. It adds 87 tokens to every session and 2,058 once invoked, about $0.0004 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 2026-09-03.
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