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 agentmods add skills/controlplane-com/ai-plugin/stateful-storagenpx skills add controlplane-com/ai-plugin --skill stateful-storagegit clone --depth 1 https://github.com/controlplane-com/ai-pluginWhat 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 | $0.00045 | $0.03949 |
| Opus 5 | $0.00023 | $0.01975 |
| Sonnet 5 | $0.00009 | $0.00790 |
| Haiku 4.5 | $0.00005 | $0.00395 |
Grade A, and why
stateful-storage 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 — 204 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Stateful Storage & VolumeSets
Tool availability: the snapshot tools (
create_volumeset_snapshot,list_volumeset_snapshots,restore_volumeset_snapshot,delete_volumeset_snapshot),shrink_volumeset, anddelete_volumeset_volumeare in thefullMCP toolset;create_volumeset,update_volumeset,mount_volumeset_to_workload,expand_volumeset, and the genericlist_resources/get_resource/delete_resourcereads are incore. If afulltool is not advertised, reconnect the MCP server with?toolsets=fullor use thecplnCLI fallback.
A VolumeSet is GVC-scoped persistent storage for workloads. The workload skill covers the basics (stateful type, reserved mount paths, the 15-volume limit, create-then-verify); this skill is the full volume-set detail. The one trap that drives most rework: fileSystemType and performanceClass are immutable (a PATCH that changes either returns HTTP 400) — to change either you must create a new volumeset, and the old data does not carry over. Choose both at creation.
Most databases don't need this skill: template-catalog installs Postgres, Redis, MySQL, MongoDB, and more with the volumeset, snapshots, and credentials already wired — hand-build only for a custom app or an unsupported engine.
Filesystem types and performance classes
| Filesystem | Access | Workloads | Volumes provisioned | Snapshots / shrink / delete-volume |
|---|---|---|---|---|
ext4 |
read-write-once | one stateful/vm workload | one per replica, per location | yes |
xfs |
read-write-once | one stateful/vm workload | one per replica, per location | yes |
shared |
read-write-many | any workload type, many at once | one per location (shared by all replicas) | no — expand only |
| Performance class | Min | Max | Filesystems |
|---|---|---|---|
general-purpose-ssd |
10 GB | 65536 GB | ext4, xfs |
high-throughput-ssd |
200 GB | 65536 GB | ext4, xfs |
shared |
10 GB | 65536 GB | shared (auto-set) |
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 · 204 lines · 45 tokens per session scan A 60e674b5854a
stateful-storage is a skill published in the GitHub repository controlplane-com/ai-plugin (10 stars, last pushed 9d ago), licensed MIT. It adds 45 tokens to every session and 3,949 once invoked, about $0.0002 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 2026-08-31.
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