What is confidential?

A workflow for encrypting and decrypting confidential content, creating signatures, and managing protected files. It routes Hugo Markdown to cryptoid, browser-viewable HTML or assets to pagevault, and other files to GPG.

Use it to protect Hugo pages, HTML output, PDFs, images, and other files, or to create and verify GPG signatures.

It helps prevent using the wrong encryption tool for a particular kind of content, especially on Hugo sites where Markdown and assets follow different paths.

confidential — Skill for Claude Code by queelius/claude-anvil

Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code

/plugin marketplace add queelius/claude-anvil

Claude Code

/plugin install alex-confidential

Made for: Claude Code.

Or install alex-confidential, the plugin that ships this one along with the rest of its 1 skill.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/queelius/claude-anvil/confidential/github.svg)](https://agentmods.dev/skills/queelius/claude-anvil/confidential)

Your own site

<a href="https://agentmods.dev/skills/queelius/claude-anvil/confidential"><img src="https://agentmods.dev/badge/skills/queelius/claude-anvil/confidential/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/queelius/claude-anvil/confidential"><img src="https://agentmods.dev/badge/skills/queelius/claude-anvil/confidential.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 56 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 837 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.

Model	Per session	Once invoked
Fable 5.1	$0.00056	$0.00837
Opus 5.5	$0.00022	$0.00335
Sonnet 5.5	$0.00011	$0.00167
Haiku 4.5	$0.00006	$0.00084

Measured 2d ago against content hash 2f5515236cfe, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

confidential 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 2d 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.

alex-confidential/skills/confidential/SKILL.md · 58 lines

How it starts

The opening of the file, as written. The whole thing — 58 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Confidentiality Toolkit

Pick the right tool for what needs protecting, apply it, and optionally sign the result.

Tool Selection

Signal	Tool	Why
Hugo site, markdown under `content/`, `_index.md` cascade, `.cryptoid.yaml`	cryptoid	Multi-user/group whole-page encryption integrated with the Hugo build
HTML files, built site output, PDFs/images for web delivery, `<pagevault>` tags	pagevault	Section-level or whole-file encryption, self-contained HTML with viewers
Signing, signature verification, offline archives, `.gpg`/`.sig` files	gpg	Detached signatures, public-key encryption, passphrase archives

Decision Tree

Is the target Hugo MARKDOWN content (files under content/)?
  YES -> cryptoid
  NO  -> Is this HTML, built site output, or a file meant for browser viewing?
    YES -> pagevault
    NO  -> gpg

Hugo carve-out: cryptoid encrypts markdown only. Hugo assets (PDFs, images in static/) and built HTML go to pagevault, even on a Hugo site.

Override: if the user names a tool explicitly, use it.

Compound Workflows

Encrypt and sign: lock with pagevault (or build the cryptoid-encrypted site), then gpg --detach-sign the output.
Verify then decrypt: verify the signature against the expected signer's fingerprint (not just "Good signature"), then pagevault unlock. Recipe in gpg.md.
Web delivery plus archive: pagevault lock for browser access, gpg -e the original for offline backup.

Safety Rules (apply to every tool)

Secrets never on argv. Do not pass passwords with -p, --passphrase, or echo "pw" |: argv is visible in ps and literals land in shell history. Use the tool's prompt, its config file (.pagevault.yaml, .cryptoid.yaml), the PAGEVAULT_PASSWORD environment variable, or gpg's --passphrase-file/--passphrase-fd 3.
Config files hold cleartext credentials. .cryptoid.yaml and .pagevault.yaml must be in .gitignore.
Private source repo. cryptoid restores plaintext after each build and pagevault leaves the unlocked originals in place, so the source repo holds plaintext. It must be private, or the plaintext must never be committed.
Strong passphrases. Ciphertext is published and PBKDF2 (310,000 iterations) is the only brake on offline guessing. Use long random passphrases, not memorable words.
Deploy the locked files. pagevault never overwrites its input: HTML goes to _locked/ (or -d DIR), other files to a sibling .html (or -o FILE). cryptoid encrypts content/ in place until cryptoid decrypt. Confirm the deployed files are the locked ones.

Read the full file on GitHub · 58 lines

Files

What ships with it

3 files 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.

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.

2d ago Changed · -95 lines · +7 tokens per session 2f5515236cfe
5d ago Changed 04465a68814b
1mo ago First seen · 153 lines · 49 tokens per session scan A dfacf7a818e3

Subscribe to this mod's changes

confidential is a skill published in the GitHub repository queelius/claude-anvil (2 stars, last pushed 3d ago), licensed MIT. It adds 56 tokens to every session and 837 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.

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