Architect-Loop: A cross-vendor AI agent loop combining Claude Code and GPT Codex for automated development
By
DanMcInerney
Pulled from the oven just right. Trustworthy, fact-dense, deeply satisfying.
Summary
A GitHub repository (architect-loop) that implements a cross-vendor AI agent loop using Claude Code (as the architect/planner) and GPT-5.5 Codex (as the builder/researcher). The system splits development work between two AI models: one designs and validates, the other executes engineering and research tasks in parallel. It runs on existing flat-rate subscriptions without requiring API keys or per-token billing. The tool installs in 30 seconds and uses two commands (/architect and /builder) to orchestrate the workflow.
Key quotes
· 3 pulledClaude Fable is the architect — it designs every slice, freezes the acceptance gates, and judges the results.
GPT-5.5 Codex is the builder and researcher — it does all the engineering and all the web research, in parallel, unattended, for hours.
Two Claude Code skills that run this cross-vendor loop on the flat-rate subscriptions you already have — no API keys, no token bills.
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