diff-env

diff-env is a command for Claude Code from rohitg00/awesome-claude-code-toolkit. It costs 0 tokens per session (301 once invoked), scanned A, original, Apache-2.0.

An environment-variable comparison command that checks configuration such as URLs, ports, and feature flags across two environments without revealing secret values.

In plain words
What is it for?
Use it to compare development, staging, and production configuration and produce a masked difference report.
Why use it?
It finds missing variables, mismatched settings, placeholders, and unsafe plaintext secrets before they cause deployment or security problems.

Command for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the env-sync plugin — 2 commands shipped together

Good fit Use it to compare development, staging, and production configuration and produce a masked difference report.

Compare 6 commands from other repositories ↓
Install with agentmods
npx agentmods add commands/rohitg00/awesome-claude-code-toolkit/diff-env
About the project

Awesome Claude Code Toolkit is a curated collection of extensions and configuration for Claude Code, including agents, skills, commands, plugins, hooks, rules, templates, MCP configurations, and companion apps. It is for Claude Code users who want ready-made workflows and integrations for different development tasks. The catalogue add-ons are selected components from this toolkit.

rohitg00/awesome-claude-code-toolkit · 2,598 stars · on GitHub

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.

Clone the repo
git clone --depth 1 https://github.com/rohitg00/awesome-claude-code-toolkit

Made for: Claude Code.

Or install env-sync, the plugin that ships this one along with the rest of its 2 commands.

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 diff-env

README.md
[![agentmods](https://agentmods.dev/badge/commands/rohitg00/awesome-claude-code-toolkit/diff-env.svg)](https://agentmods.dev/commands/rohitg00/awesome-claude-code-toolkit/diff-env)
Your own site
<a href="https://agentmods.dev/commands/rohitg00/awesome-claude-code-toolkit/diff-env"><img src="https://agentmods.dev/badge/commands/rohitg00/awesome-claude-code-toolkit/diff-env.svg" alt="Measured on agentmods" height="20"></a>
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 301 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 $0.00000 $0.00301
Opus 5 $0.00000 $0.00151
Sonnet 5 $0.00000 $0.00060
Haiku 4.5 $0.00000 $0.00030

Measured 5d ago against content hash 6cee41a88e7e, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

diff-env 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 5d 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.

plugins/env-sync/commands/diff-env.md · 29 lines

What it actually says

/diff-env - Diff Environment Variables

Compare environment variables between two environments.

Steps

  1. Ask the user for the two environments to compare (e.g., dev vs staging)
  2. Load environment variables from both sources (.env files, vault, cloud config)
  3. Create a unified list of all variables across both environments
  4. Categorize each variable: present in both, only in source, only in target
  5. For variables present in both, compare values (without showing secret values)
  6. Identify value mismatches: different URLs, ports, feature flags
  7. Flag variables that are empty or have placeholder values
  8. Check for variables that should differ (DATABASE_URL) vs should match (API_VERSION)
  9. Generate a diff table: variable name, source value, target value, status
  10. Highlight security concerns: secrets in plaintext, default credentials
  11. Suggest which missing variables need to be added to which environment
  12. Save the diff report for reference

Rules

  • Never display the actual values of secret variables (mask with ****)
  • Identify secrets by naming patterns: *_KEY, *_SECRET, *_PASSWORD, *_TOKEN
  • Show whether values match without revealing the actual values for sensitive vars
  • Flag environment-specific variables that accidentally have the same value
  • Detect URL differences that indicate wrong environment configuration
  • Report variables that exist in code but are missing from both environments
  • Include the diff timestamp and environments compared in the report
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. 5d ago First seen · 29 lines · 0 tokens per session scan A 6cee41a88e7e

Subscribe to this mod's changes

diff-env is a command published in the GitHub repository rohitg00/awesome-claude-code-toolkit (2,598 stars, last pushed 3mo ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 301 tokens. 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 2026-09-03.