building-with-eas

building-with-eas is a skill for Claude Code from rahulkeerthi/expo-toolkit. It costs 37 tokens per session (2,757 once invoked), scanned A, original, MIT.

A guide to Expo Application Services (EAS), the cloud service for building and submitting iOS and Android apps.

In plain words
What is it for?
Use it to set up build profiles, manage Apple and Android signing credentials, create development or production builds, submit them, and check build status.
Why use it?
It helps avoid configuration, credential, version, and failed-build problems when preparing an Expo app for testing or release.

Skill for Claude Code

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

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is node tools/check-version.js /path/to/your/app.

Part of the expo-toolkit plugin — 6 skills, 7 commands, 5 agents shipped together

Good fit Use it to set up build profiles, manage Apple and Android signing credentials, create development or production builds, submit them, and check build status.

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/rahulkeerthi/expo-toolkit
agentmods
npx agentmods add skills/rahulkeerthi/expo-toolkit/building-with-eas

Made for: Claude Code.

Or install expo-toolkit, the plugin that ships this one along with the rest of its 6 skills, 7 commands, 5 agents.

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 building-with-eas

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

Your own site · 80×15
<a href="https://agentmods.dev/skills/rahulkeerthi/expo-toolkit/building-with-eas"><img src="https://agentmods.dev/badge/skills/rahulkeerthi/expo-toolkit/building-with-eas.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 37 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,757 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 $0.00037 $0.02757
Opus 5 $0.00018 $0.01378
Sonnet 5 $0.00007 $0.00551
Haiku 4.5 $0.00004 $0.00276

Measured 12d ago against content hash b7504a2f4ae9, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

building-with-eas 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 12d 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.

skills/building-with-eas/SKILL.md · 486 lines

How it starts

The opening of the file, as written. The whole thing — 486 lines — stays where its author put it; the contents beside it link to each section on GitHub.

EAS Build & Submit Reference

Plugin Tools

Before production builds, verify your version hasn't already been released:

# Check version against EAS build history and store releases
cd /path/to/expo-toolkit && npm run check-version -- /path/to/your/app

# Or directly
node tools/check-version.js /path/to/your/app
node tools/check-version.js /path/to/your/app --json

This checks:

  • Current version in app.config.js
  • Recent EAS builds and their submission status
  • autoIncrement settings in eas.json
  • Provides guidance if version bump is needed

Essential Commands

# Initialize EAS in project
eas init

# Configure build profiles
eas build:configure

# Check/manage credentials
eas credentials
eas credentials --platform ios
eas credentials --platform android

# Build commands
eas build --platform ios --profile development
eas build --platform android --profile preview
eas build --platform all --profile production

# Build with auto-submit
eas build --platform ios --profile production --auto-submit
eas build --platform android --profile production --auto-submit

# Check build status
eas build:list

eas.json Configuration

Standard Build Profiles

The eas.json file defines build profiles. A well-configured file looks like:

{
  "cli": {
    "version": ">= 16.18.0",
    "appVersionSource": "remote"
  },
  "build": {
    "base": {
      "env": {
        "APP_VARIANT": "production"
      }
    },
    "development": {
      "extends": "base",
      "developmentClient": true,
      "distribution": "internal",
      "env": {
        "APP_VARIANT": "development"
      },
      "ios": {
        "simulator": false
      },
      "android": {
        "buildType": "apk",
        "gradleCommand": ":app:assembleDebug"
      }
    },
    "development-simulator": {
      "extends": "development",
      "ios": {
        "simulator": true
      },
      "android": {
        "buildType": "apk"
      }
    },
    "preview": {
      "extends": "base",
      "distribution": "internal",
      "env": {
        "APP_VARIANT": "preview"
      },
      "android": {
        "buildType": "apk"
      }
    },
    "production": {
      "extends": "base",
      "autoIncrement": true,
      "env": {
        "APP_VARIANT": "production"
      }
    }
  },
  "submit": {
    "production": {
      "ios": {
        "appleId": "[email protected]",
        "ascAppId": "1234567890"
      },
      "android": {
        "serviceAccountKeyPath": "./play-store-credentials.json",
        "track": "internal"
      }
    }
  }
}

Read the full file on GitHub · 486 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. 12d ago First seen · 486 lines · 37 tokens per session scan A b7504a2f4ae9

Subscribe to this mod's changes

building-with-eas is a skill published in the GitHub repository rahulkeerthi/expo-toolkit (5 stars, last pushed 4mo ago), licensed MIT. It adds 37 tokens to every session and 2,757 once invoked, about $0.0002 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 2026-08-31.

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