Env Doctor

Env Doctor

Diagnose your .env file before deployment. Catches the configuration bugs that only show up in production at 2 AM.

What it does

• Compares .env against .env.example — finds missing vars
• Detects placeholder values never replaced (..., your-key-here, sk-ant-XXXX)
• Flags secrets that look wrong (wrong prefix, wrong length, wrong format)
• Checks for common mistakes: trailing spaces, Windows line endings, BOM markers
• Warns about vars that exist in .env but not in .env.example (undocumented secrets)
• Validates known API key formats (Anthropic, OpenAI, Stripe, Polygon, Telegram)

Usage

Run env doctor on this project.
Compare .env against .env.example.
Check for: missing vars, placeholder values, format issues, undocumented secrets.

Example Output

Env Doctor — 2026-05-13

MISSING VARS (in .env.example but not in .env)
  POLYGON_API_KEY          — required for options scanner
  NAVER_CLIENT_SECRET      — required for Korean news feed

PLACEHOLDER VALUES (never replaced)
  TWITTER_BEARER_TOKEN = "..."        — still default
  TWITTER_API_KEY = "..."             — still default

FORMAT WARNINGS
  ANTHROPIC_API_KEY = "sk-ant-api03-..."
    OK: correct prefix, length looks right

  TELEGRAM_BOT_TOKEN = "1234567890:ABC..."
    OK: correct format (number:hash)

  POLYGON_API_KEY = ""
    WARN: empty string — key exists but has no value

UNDOCUMENTED SECRETS (in .env but not in .env.example)
  DEVTO_API_KEY            — consider adding to .env.example with placeholder

ENCODING ISSUES
  None found (UTF-8, Unix line endings)

SUMMARY
  2 missing required vars
  2 placeholder vars not replaced
  1 undocumented secret
  0 encoding issues

Run: cp .env.example .env.local and fill in missing values

Validated API key formats

| Service | Expected format | Example | |---------|----------------|---------| | Anthropic | sk-ant-api03-... | 50+ chars | | OpenAI | sk-proj-... or sk-... | 51 chars | | Stripe | sk_live_... or sk_test_... | 32+ chars | | Polygon.io | alphanumeric, 32 chars | | | Telegram Bot | {number}:{hash} | 1234567890:ABC... | | dev.to | alphanumeric, 20 chars | |

Configuration

Run env doctor:
Files: .env vs .env.example
Check format: ANTHROPIC_API_KEY, TELEGRAM_BOT_TOKEN, POLYGON_API_KEY
Required vars: ANTHROPIC_API_KEY, TELEGRAM_BOT_TOKEN, TELEGRAM_CHANNEL_ID
Warn if any var contains: "...", "your-", "xxx", "test", "placeholder"

Common catches

The classic: ANTHROPIC_API_KEY=sk-ant-XXXX — copied from docs, never replaced

The silent fail: DATABASE_URL= — trailing space means the var is a single space, not empty. Some parsers treat this as set.

The Windows trap: .env edited on Windows has \r\n line endings. Some Node.js dotenv parsers include the \r in the value. "mypassword\r" is not "mypassword".

The gitignore miss: .env.production not in .gitignore. Happens when someone adds a new env file variant.

Requirements

• Read tool access (reads .env and .env.example)
• No API keys needed — pure text analysis

Free

Fully free and open source.

→ https://github.com/tellmefrankie/news-engine

Author

Built after a production deploy failed because TELEGRAM_BOT_TOKEN was still "..." in the production .env. The env doctor would have caught it in 2 seconds.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: tellmefrankie
• Source: tellmefrankie/ai-investment-skills
• License: MIT
• Homepage: https://jaehyunpark.gumroad.com/l/tcyahy

Install and usage instructions live in the source repository linked above.