expo-eas-build

expo-eas-build is a skill for Claude Code from fatihkan/badi. It costs 75 tokens per session (1,575 once invoked), scanned A, original, MIT.

A guide to building Expo React Native apps with EAS Build, Expo's cloud build service. It covers build profiles, iOS and Android signing credentials, secrets, hooks, and monorepos, which are repositories containing several related projects.

In plain words
What is it for?
Use it to configure eas.json, manage Apple and Android signing files, store secrets, configure build hooks, and build apps from workspace-based repositories.
Why use it?
It replaces ad hoc build settings and helps keep development, testing, and production builds consistent. It also explains the credentials and environment values required to create installable apps.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: mentions Claude Code.

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is "eas-build-on-success": "node ./scripts/notify-slack.js".

Part of the badi plugin — 81 skills, 86 commands, 30 agents, 7 hooks shipped together

Good fit Use it to configure eas.json, manage Apple and Android signing files, store secrets, configure build hooks, and build apps from workspace-based repositories.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/fatihkan/badi
agentmods
npx agentmods add skills/fatihkan/badi/expo-eas-build

Made for: Claude Code.

Or install badi, the plugin that ships this one along with the rest of its 81 skills, 86 commands, 30 agents, 7 hooks.

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 expo-eas-build

README.md
[![agentmods](https://agentmods.dev/badge/skills/fatihkan/badi/expo-eas-build/github.svg)](https://agentmods.dev/skills/fatihkan/badi/expo-eas-build)
Your own site
<a href="https://agentmods.dev/skills/fatihkan/badi/expo-eas-build"><img src="https://agentmods.dev/badge/skills/fatihkan/badi/expo-eas-build/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.

agentmods 80×15 button for expo-eas-build

Your own site · 80×15
<a href="https://agentmods.dev/skills/fatihkan/badi/expo-eas-build"><img src="https://agentmods.dev/badge/skills/fatihkan/badi/expo-eas-build.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 75 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,575 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 pass 7 Sept 2026
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00075 $0.01575
Opus 5 $0.00037 $0.00788
Sonnet 5 $0.00015 $0.00315
Haiku 4.5 $0.00007 $0.00158

Measured 4d ago against content hash 0d7e889aa4ac, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

expo-eas-build 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 4d 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.

.claude/skills-vault/expo-eas-build/SKILL.md · 223 lines

How it starts

The opening of the file, as written. The whole thing — 223 lines — stays where its author put it; the contents beside it link to each section on GitHub.

expo-eas-build

A guide to profile discipline, credentials management, and the build process for EAS Build. Scoped to eas.json configuration, iOS provisioning + push cert, Android keystore + service account, secrets, and monorepo support. Store-submit DETAIL lives in expo-eas-submit.

What It Does

  • eas.json profile architecture (development / preview / production)
  • iOS credentials: provisioning profile, distribution cert, push cert
  • Android credentials: keystore, upload key, FCM service account
  • Build cache, environment variables, EAS Secrets
  • Build hooks (eas-build-pre-install, eas-build-on-success)
  • Monorepo (pnpm / yarn workspaces / turborepo) support

Setup

npm install -g eas-cli
eas login
eas whoami
eas init                  # assigns the project ID
eas build:configure       # eas.json starter

eas.json Template

{
  "cli": { "version": ">= 7.0.0", "appVersionSource": "remote" },
  "build": {
    "base": {
      "node": "20.11.0",
      "env": { "EXPO_PUBLIC_APP_ENV": "base" }
    },
    "development": {
      "extends": "base",
      "developmentClient": true,
      "distribution": "internal",
      "ios": { "simulator": true },
      "channel": "development"
    },
    "preview": {
      "extends": "base",
      "distribution": "internal",
      "android": { "buildType": "apk" },
      "channel": "preview",
      "env": { "EXPO_PUBLIC_APP_ENV": "preview" }
    },
    "production": {
      "extends": "base",
      "autoIncrement": true,
      "channel": "production",
      "env": { "EXPO_PUBLIC_APP_ENV": "production" }
    }
  },
  "submit": { "production": {} }
}

Profile Strategy

Profile Distribution Purpose Device
development internal Dev client, JS debug, hot reload Device/sim
preview internal QA/stakeholder test (IPA/APK) Device
production store App Store / Play Store Device

iOS Credentials

eas credentials                    # interactive menu
eas credentials -p ios             # iOS only

Read the full file on GitHub · 223 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.

  1. 4d ago First seen · 223 lines · 75 tokens per session scan A 0d7e889aa4ac

Subscribe to this mod's changes

expo-eas-build is a skill published in the GitHub repository fatihkan/badi (7 stars, last pushed 3d ago), licensed MIT. It adds 75 tokens to every session and 1,575 once invoked, about $0.0004 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 2026-09-06.

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