Agent skill

Deprecate Env Var

by blockscout in blockscout/frontend

Checklist for deprecating a NEXTPUBLIC environment variable — immediate removal, or a grace period before a later removal.

Custom licenceAuto-check: notesDevOps & Cloud

Install Deprecate Env Var

skills CLI
$ npx skills add blockscout/frontend --skill deprecate-env-var -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install blockscout/frontend deprecate-env-var --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/blockscout/frontend.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/deprecate-env-var .claude/skills/deprecate-env-var && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
deprecate-env-var
GitHub stars
307
Token cost
~2.6k tokens
SKILL.md length
1,319 words
Files
1
Skills in repo
24
Repo updated
First seen
Licence
Custom licence

At a glance

Checklist for deprecating a NEXTPUBLIC environment variable — immediate removal, or a grace period before a later removal.

  • Replacing a runtime env var
  • SKILL.md covers How removal is enforced, Step 0 — Find the current…, Branch A — Immediate removal and Branch B — Grace period (two…, plus 1 more section
  • Calls gh and pnpm; needs NEXT_PUBLIC_RE_CAPTCHA_V3_APP_SITE_KEY and NEXT_PUBLIC_RE_CAPTCHA_APP_SITE_KEY
  • Tasks that involve Secrets management

What it does

Deprecate Env Var is an agent skill from blockscout/frontend. Checklist for deprecating a NEXTPUBLIC environment variable — immediate removal, or a grace period before a later removal. Use when removing, renaming, or replacing a runtime env var.

Its SKILL.md is about 2.6k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in DevOps & Cloud, covering Secrets management. The repository describes itself as: Front-end application for Blockscout chain explorer.

When your agent uses it

  • Replacing a runtime env var
  • Tasks that involve Secrets management

Example prompts

  • “/deprecate-env-var”

Requirements

  • A credential in NEXT_PUBLIC_RE_CAPTCHA_V3_APP_SITE_KEY
  • A credential in NEXT_PUBLIC_RE_CAPTCHA_APP_SITE_KEY

What it can do on your machine

Read from SKILL.md and the folder at commit 56ff467. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • gh
    • pnpm

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use gh and pnpm, which can reach the network depending on how they are called.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names these keys or tokens, usually read from environment variables:

    • NEXT_PUBLIC_RE_CAPTCHA_V3_APP_SITE_KEY
    • NEXT_PUBLIC_RE_CAPTCHA_APP_SITE_KEY

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Deprecate Env Var loads about 2.6k tokens when it runs. Until then it costs about 51 tokens; SKILL.md has 1,319 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~51
When it runs · the whole SKILL.md, loaded when a task matches
~2.6k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

  • NoteMentions a .env fileSKILL.md:22
    `.env.registry`, which `collect_envs.sh` generates by scanning

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 1,319 words (~2,552 tokens).

“This is the reverse of the add-env-var skill. Read .agents/rules/env-vars.md first for background: how runtime delivery works, how the config object is structured, the three value types, and where validation lives.”

— opening of SKILL.md by blockscout, Custom licence
name
deprecate-env-var

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .agents/skills/deprecate-env-var of blockscout/frontend.

Open the folder on GitHubat commit 56ff467

Compare with similar skills

Deprecate Env Var next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Deprecate Env Var compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Deprecate Env Var this skillblockscout/frontend307—~2.6kAutomated safety check: NotesCustom licence
Iron Proxy Gateway for NanoClawnanocoai/nanoclaw31k—~4.6kAutomated safety check: NotesMIT
LangBot Deployment Guidelangbot-app/LangBot18k—~1.2kAutomated safety check: NotesApache-2.0
Env Var Conventionssgl-project/sglang37k2 repos~2.9kAutomated safety check: PassApache-2.0
Mac Fleet Maintenancesteipete/agent-scripts7.3k—~4.8kAutomated safety check: PassMIT
Add Config Env Varbaserow/baserow6.1k—~1.1kAutomated safety check: PassCustom licence

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  • Env Var Conventions

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All 24 skills in this repo
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  • Add Env Var

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    Step-by-step checklist for adding a new NEXTPUBLIC environment variable.

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  • Add New Page

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  • Create Issue

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  • Publish Beta Types

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    Publish a beta version of a @blockscout/-types npm package and pin it here.

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  • Resolve API URL

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    Resolve the real request URL of an API resource on a live Blockscout instance (service:name + instance → full URL).

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Categories

Questions about Deprecate Env Var

What does Deprecate Env Var do?

Checklist for deprecating a NEXTPUBLIC environment variable — immediate removal, or a grace period before a later removal. Deprecate Env Var is an agent skill from blockscout/frontend. Checklist for deprecating a NEXTPUBLIC environment variable — immediate removal, or a grace period before a later removal.

When should I use Deprecate Env Var?

Deprecate Env Var fits situations like: replacing a runtime env var; tasks that involve Secrets management.

How do I install Deprecate Env Var in Claude Code?

Run `npx skills add blockscout/frontend --skill deprecate-env-var -a claude-code`. Or copy the skill folder (.agents/skills/deprecate-env-var in blockscout/frontend) into .claude/skills/deprecate-env-var in your project. Claude Code loads it when a task matches its description.

How do I install Deprecate Env Var in Codex?

Run `npx skills add blockscout/frontend --skill deprecate-env-var -a codex`. Or copy the skill folder (.agents/skills/deprecate-env-var in blockscout/frontend) into .agents/skills/deprecate-env-var in your project. Codex loads it when a task matches its description.

Can I use Deprecate Env Var in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add blockscout/frontend --skill deprecate-env-var -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/deprecate-env-var, .gemini/skills/deprecate-env-var, .github/skills/deprecate-env-var and .opencode/skills/deprecate-env-var in your project.

What does Deprecate Env Var need to run?

Going by SKILL.md and its folder, Deprecate Env Var needs the command-line tools its instructions call (gh and pnpm) and credentials named NEXT_PUBLIC_RE_CAPTCHA_V3_APP_SITE_KEY and NEXT_PUBLIC_RE_CAPTCHA_APP_SITE_KEY. Our summary lists: A credential in NEXT_PUBLIC_RE_CAPTCHA_V3_APP_SITE_KEY; A credential in NEXT_PUBLIC_RE_CAPTCHA_APP_SITE_KEY.

Does Deprecate Env Var access the network?

SKILL.md contains no URLs. Its commands use gh, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Deprecate Env Var safe to install?

Our automated static check of SKILL.md found notes only (mentions a .env file), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Deprecate Env Var use?

Deprecate Env Var has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Deprecate Env Var use?

About 2.6k tokens (SKILL.md is roughly 10k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Deprecate Env Var?

Skills that share tags, products or a category with Deprecate Env Var: Iron Proxy Gateway for NanoClaw (nanocoai/nanoclaw, 31k stars), LangBot Deployment Guide (langbot-app/LangBot, 18k stars), Env Var Conventions (sgl-project/sglang, 37k stars) and Mac Fleet Maintenance (steipete/agent-scripts, 7.3k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Deprecate Env Var?

blockscout (a GitHub organization) maintains it in blockscout/frontend, which has 307 GitHub stars. The repository holds 24 skills in this directory. The repository was last updated on October 9, 2026.

Source: blockscout/frontend on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.