fold: Skill for Claude Code

.claude/skills/helm-chart/SKILL.md

helm-chart is a skill for Claude Code from fold-run/fold. It costs 61 tokens per session (1,071 once invoked), scanned A, original, Apache-2.0.

A checklist for safely changing a Helm chart, the package used to configure and deploy an application on Kubernetes. It covers rendering the chart in several deployment setups and keeping its documentation consistent.

In plain words
What is it for?
Use it when editing deploy/helm/, adding configuration values, or fixing a failed helm-check.
Why use it?
It helps catch deployment mistakes before a chart is published, where an incorrect version cannot be replaced under the same tag.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

This is fold-run/fold's own configuration. It tells Claude Code how to work on fold itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything fold configures →

Reuse

Borrowing it

Nothing to install: this file belongs to fold-run/fold. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/fold-run/fold/main/.claude/skills/helm-chart/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/fold-run/fold

Made for: Claude Code.

Wrote 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.

agentmods badge for helm-chart

README.md
[![agentmods](https://agentmods.dev/badge/skills/fold-run/fold/helm-chart/github.svg)](https://agentmods.dev/skills/fold-run/fold/helm-chart)
Your own site
<a href="https://agentmods.dev/skills/fold-run/fold/helm-chart"><img src="https://agentmods.dev/badge/skills/fold-run/fold/helm-chart/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.

agentmods 80×15 button for helm-chart

Your own site · 80×15
<a href="https://agentmods.dev/skills/fold-run/fold/helm-chart"><img src="https://agentmods.dev/badge/skills/fold-run/fold/helm-chart.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 61 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,071 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00061 $0.01071
Opus 5.5 $0.00024 $0.00428
Sonnet 5.5 $0.00012 $0.00214
Haiku 4.5 $0.00006 $0.00107

Measured 2mo ago against content hash ce6e85692abf, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

helm-chart 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 2mo 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.

.claude/skills/helm-chart/SKILL.md · 99 lines

How it starts

The opening of the file, as written. The whole thing — 99 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Changing the Helm chart

deploy/helm/fold is a published artifact: the release workflow packages it to oci://ghcr.io/fold-run/charts/fold and attests its provenance. A published OCI tag is immutable, so a mistake here cannot be amended in place — only superseded.

The gate

make helm-check

Three things, and the third is the one people forget exists:

  1. helm lint against ci/default-values.yaml.
  2. helm template against every ci/*.yaml, with --api-versions monitoring.coreos.com/v1 so the ServiceMonitor renders without a cluster.
  3. The required-config guard: rendering with no config must fail. A chart that installs with no upstreams would start a gateway that federates nothing, so the failure is the feature. If your change makes a bare helm template succeed, you have broken it.

Not part of make check — it needs helm on PATH, and the contributor toolchain stays Go-only. CI runs it as its own helm job.

The three ci values files are three deployment shapes

They are not examples; they are the render matrix. A new value should be exercised by at least one, and a value that changes rendering in a shape none of them covers needs a fourth or an extension to one.

File Shape it pins
default-values.yaml Minimal: inline config, no allowedHosts
existing-configmap-values.yaml Operator-managed ConfigMap, Redis by URL
full-values.yaml Ingress, HPA, PDB, ServiceMonitor, Redis via secret, secrets via envFrom

The probe Host-header trap

fold's DNS-rebinding protection covers /health like every other path, so a kubelet probe carries a Host the allowlist must admit. The chart resolves this three different ways, and each ci file exists to pin one:

  • No allowedHosts → the probe Host falls back to localhost.
  • allowedHosts set → it derives from allowedHosts[0].
  • existingConfigMap → probes.hostHeader is mandatory, because the chart cannot see inside an operator's ConfigMap to find the allowlist.

Read the full file on GitHub · 99 lines

Changes

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.

  1. 2mo ago First seen · 99 lines · 61 tokens per session scan A ce6e85692abf

Subscribe to this mod's changes

helm-chart is a skill published in the GitHub repository fold-run/fold (1 stars, last pushed 12d ago), licensed Apache-2.0. It adds 61 tokens to every session and 1,071 once invoked, about $0.0002 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 2026-08-31.

Related

helm-chart compared with skills from other repositories

helm-chart next to 6 skills from other repositories
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