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Codex uses the TapKit CLI via Bash and loads skills for app knowledge.

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Setup

Install TapKit skills for Codex: 
npx skills add tapkit

# ? Select skills to install:
#   ✓ tapkit        (core — device control)
#   ✓ hinge         (app — Hinge dating)
#   ✓ telegram      (app — Telegram messaging)
#   ✓ tiktok        (app — TikTok video)
#   ✓ linkedin      (app — LinkedIn professional)
#   ✓ uber-eats     (app — Uber Eats delivery)
#
# Installed 6 skills to .agents/skills/

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Usage

Codex calls TapKit via Bash commands. The skill teaches it the screenshot → look → act → verify workflow: 
you: Take a screenshot of my phone and tell me what app is open

codex: Running: tapkit screenshot --base64
        I can see Twitter is open on the Home feed. The top tweet is from
        @elonmusk about... Would you like me to interact with anything?
The core skill teaches Codex how to use the coordinate system, chain commands, and verify actions — so it knows the workflow without you having to explain it.