What is output-credentials-env-vars?

A guide for connecting encrypted credentials to environment variables using a special credential reference. Environment variables are configuration values that programs read when they start.

Use it when wiring LLM provider keys, database URLs, service tokens, or other environment variables to encrypted credentials.

It lets workers obtain API keys and other sensitive settings from encrypted storage instead of plain-text configuration.

output-credentials-env-vars — Skill for Claude Code by growthxai

Install

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.

Any agent

npx skills add growthxai/output --skill output-credentials-env-vars

Clone the repo

git clone --depth 1 https://github.com/growthxai/output

Made for: Claude Code.

Or install outputai, the plugin that ships this one along with the rest of its 50 skills, 5 agents, 1 hook.

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/growthxai/output/output-credentials-env-vars/github.svg)](https://agentmods.dev/skills/growthxai/output/output-credentials-env-vars)

Your own site

<a href="https://agentmods.dev/skills/growthxai/output/output-credentials-env-vars"><img src="https://agentmods.dev/badge/skills/growthxai/output/output-credentials-env-vars/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/growthxai/output/output-credentials-env-vars"><img src="https://agentmods.dev/badge/skills/growthxai/output/output-credentials-env-vars.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 50 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,148 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. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 5 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 27
Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.

Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
high Privilege Escalation · line 36
Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.

Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
high Privilege Escalation · line 139
Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.

Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
medium MCP Rug Pull · line 102
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]
medium MCP Rug Pull · line 103
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]

How audits are shown

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	$0.00050	$0.01148
Opus 5	$0.00025	$0.00574
Sonnet 5	$0.00010	$0.00230
Haiku 4.5	$0.00005	$0.00115

Measured 10d ago against content hash f4e1da55785b, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

output-credentials-env-vars 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 10d 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.

coding_assistants/claude/plugins/outputai/skills/output-credentials-env-vars/SKILL.md · 150 lines

How it starts

The opening of the file, as written. The whole thing — 150 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Credentials as Environment Variables

When to Use This Skill

Setting up ANTHROPIC_API_KEY or OPENAI_API_KEY from encrypted credentials
Wiring any credential path to a process.env variable automatically
Migrating from plaintext .env secrets to encrypted credentials
Understanding why an env var is being resolved at worker startup

The `credential:` Convention

Any env var whose value starts with credential: is resolved from encrypted credentials at worker startup. The format is:

ENV_VAR_NAME=credential:<dot.path>

Example `.env`

# These are resolved automatically from config/credentials.yml.enc
ANTHROPIC_API_KEY=credential:anthropic.api_key
OPENAI_API_KEY=credential:openai.api_key

# Any credential path works
MY_SERVICE_TOKEN=credential:my_service.token
DATABASE_URL=credential:postgres.url

Encrypted credentials (`config/credentials.yml.enc`)

anthropic:
  api_key: sk-ant-...        # → resolves ANTHROPIC_API_KEY

openai:
  api_key: sk-...            # → resolves OPENAI_API_KEY

my_service:
  token: tok_live_...        # → resolves MY_SERVICE_TOKEN

postgres:
  url: postgres://...        # → resolves DATABASE_URL

How It Works

Worker loads .env via dotenv — ANTHROPIC_API_KEY = "credential:anthropic.api_key"
Worker loads all workflow activity files (importing @outputai/credentials)
Worker calls runStartupHooks() — resolveCredentialRefs() runs
resolveCredentialRefs() scans process.env for credential: prefix values
Each matching var is replaced with the actual decrypted credential value
ANTHROPIC_API_KEY is now "sk-ant-..." in process.env
LLM SDK reads it normally when the first workflow activity runs

The `_env` Section in Credentials YAML

The credentials file can also declare the mapping directly in an _env section. New projects scaffold with this pre-configured:

anthropic:
  api_key: sk-ant-...
openai:
  api_key: sk-...

_env:
  ANTHROPIC_API_KEY: anthropic.api_key
  OPENAI_API_KEY: openai.api_key

Read the full file on GitHub · 150 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.

10d ago First seen · 150 lines · 50 tokens per session scan A f4e1da55785b

Subscribe to this mod's changes

output-credentials-env-vars is a skill published in the GitHub repository growthxai/output (435 stars, last pushed today), licensed Apache-2.0. It adds 50 tokens to every session and 1,148 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 2026-08-30.

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