Eas Workflows Agent Skill

EAS service (paid). Helps understand and write EAS workflow YAML files for Expo projects. Use this skill when the user asks about CI/CD or workflows in an Expo or EAS context, mentions .eas/workflows/, or wants help with EAS build pipelines or deployment automation.

2k tokens

context cost

the whole folder, loaded on every use

files

ships runnable scripts

copies elsewhere

how many repositories repackaged it

2356

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/expo/skills --skill eas-workflows

What comes with it

5 691 bytes besides the instruction

agents/openai.yaml

scripts/fetch.js

scripts/package.json

scripts/validate.js

What it tells the agent to use

found in the instruction text

Bash runs shell commands — read the instruction before connecting

The instruction itself

9 sections, as written by the author

EAS Workflows Skill

> EAS service - costs apply. EAS Workflows run on Expo Application Services, a paid product with free-tier limits. Each workflow job consumes your plan's build/compute minutes, and jobs that build or submit also need paid Apple Developer and Google Play accounts. Review https://expo.dev/pricing before triggering runs.

Help developers write and edit EAS CI/CD workflow YAML files.

Reference Documentation

Fetch these resources before generating or validating workflow files. First resolve this skill's directory, then use the fetch script in its scripts/ directory. It is implemented using Node.js and caches responses using ETags for efficiency:

# Fetch resources
node <skill-dir>/scripts/fetch.js <url>

JSON Schema — https://api.expo.dev/v2/workflows/schema
It is NECESSARY to fetch this schema
Source of truth for validation
All job types and their required/optional parameters
Trigger types and configurations
Runner types, VM images, and all enums

Syntax Documentation — https://raw.githubusercontent.com/expo/expo/refs/heads/main/docs/pages/eas/workflows/syntax.mdx
Overview of workflow YAML syntax
Examples and English explanations
Expression syntax and contexts

Pre-packaged Jobs — https://raw.githubusercontent.com/expo/expo/refs/heads/main/docs/pages/eas/workflows/pre-packaged-jobs.mdx
Documentation for supported pre-packaged job types
Job-specific parameters and outputs

Do not rely on memorized values; these resources evolve as new features are added.

Workflow File Location

Workflows live in .eas/workflows/*.yml (or .yaml).

Top-Level Structure

A workflow file has these top-level keys:

name — Display name for the workflow
on — Triggers that start the workflow (at least one required)
jobs — Job definitions (required)
defaults — Shared defaults for all jobs
concurrency — Control parallel workflow runs

Consult the schema for the full specification of each section.

Expressions

Use ${{ }} syntax for dynamic values. The schema defines available contexts:

github.* — GitHub repository and event information
inputs.* — Values from workflow_dispatch inputs
needs.* — Outputs and status from dependent jobs
jobs.* — Job outputs (alternative syntax)
steps.* — Step outputs within custom jobs
workflow.* — Workflow metadata

Generating Workflows

When generating or editing workflows:

Fetch the schema to get current job types, parameters, and allowed values
Validate that required fields are present for each job type
Verify job references in needs and after exist in the workflow
Check that expressions reference valid contexts and outputs
Ensure if conditions respect the schema's length constraints

Validation

After generating or editing a workflow file, validate it against the schema:

# Install dependencies if missing
[ -d "<skill-dir>/scripts/node_modules" ] || npm install --prefix <skill-dir>/scripts

node <skill-dir>/scripts/validate.js <workflow.yml> [workflow2.yml ...]

The validator fetches the latest schema and checks the YAML structure. Fix any reported errors before considering the workflow complete.

Answering Questions

When users ask about available options (job types, triggers, runner types, etc.), fetch the schema and derive the answer from it rather than relying on potentially outdated information.

Submitting Feedback

If you encounter errors, misleading or outdated information in this skill, report it so Expo can improve:

npx --yes submit-expo-feedback@latest --category skills --subject "eas-workflows" "<actionable feedback>"

Only submit when you have something specific and actionable to report. Include as much relevant context as possible.

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17k tokens

How to use it

Copy the folder

Take expo/eas-workflows from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.

Install what it needs

The instructions reference npm, npx. Without those the skill loads but fails at the first command.