{"slug":"openai-codex","name":"Codex","summary":"OpenAI coding agent / CLI. Another day-one harness on the Leyline install grid.","kind":"runtime","homepage":"https://openai.com/codex","publisher":"OpenAI","license":"proprietary","hasMcp":true,"hasApi":true,"costRange":"seat","composabilityRationale":"CLI and IDE hooks. MCP support varies by surface. Treat Codex as a harness slice, not an inference gateway.","functions":["code","reason","tool-call","connect"],"slices":[{"functionId":"code","label":"Codex CLI","note":"Local coding agent","cost":"ChatGPT / API seat"},{"functionId":"reason","label":"Reason","note":"OpenAI coding agent / CLI. Another day-one harness on the Leyline install grid.","cost":"seat"},{"functionId":"tool-call","label":"Tool-call","note":"OpenAI coding agent / CLI. Another day-one harness on the Leyline install grid.","cost":"seat"},{"functionId":"connect","label":"Connect","note":"OpenAI coding agent / CLI. 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