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1. Clone the Skills repo

git clone https://github.com/ArraysData/arrays-skills.git

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2. Include Skills as Codex instructions

When configuring your Codex agent, include the relevant SKILL.md files as part of the instruction set. Codex’s markdown context format is directly compatible. 
# Example: load equity fundamentals skill into agent
codex agent create my-finance-agent \
  --instructions ./arrays-skills/skills/arrays-data-api-equity-fundamentals/SKILL.md \
  --env ARRAYS_API_KEY=$ARRAYS_API_KEY
For agents that handle many domains, concatenate multiple SKILL.md files together, or use a meta-instruction that references the whole skills/ directory.

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3. Test it

Ask your Codex agent: 
Give me the top 10 holdings of SPY and their weight.
The agent should pull from the arrays-data-api-etf-fundamentals Skill.

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Notes

  • Codex doesn’t yet support automatic Skill selection across multiple SKILL.md files — you may need to specify which Skill is active per agent.
  • For multi-domain agents, see the arrays-skill-creator template to compose custom Skills.