Observed Signal · May 6, 2026 · Technical Guide · Source: DEV Community · Impact: 2/5 · Sentiment: Positive
Spec-Driven Codex Setup for Reliable Code Agents
This technical guide describes a spec-driven workflow the author uses to run Codex as a disciplined, predictable development teammate. The core rule is "No approved spec, no code changes." The setup includes repository files (CODEX.md, AGENTS.md), executable workflow definitions (.codex/WORKFLOW.md, .codex/STRATEGY.md), agent topology files (.codex/agents/*.toml) with pinned model and reasoning effort, a strict spec template (TASK-YYYY-MM-DD-###.spec.md) and enforced git hooks (.codex/hooks/workflow-guard.sh). Completed specs produce evidence files under .codex/evidence/agent-chain/<spec-id>.json recording agent name, model, chain step, timestamp and success status. Day-to-day flow: spec-architect drafts, human approval, agent-router dispatches specialist, specialist implements only in scope_in, run npm run verify, commit with spec deletion + evidence, then full-branch PR review. The author reports fewer accidental repo-wide edits, faster reviews, and improved handoffs.
Practical developer-level guidance for governing LLM-based code agents; useful for engineering teams adopting agent workflows but not a major industry announcement.
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Key Takeaways & Evidence Grounding
- Primary policy: "No approved spec, no code changes."
- Repository uses CODEX.md and AGENTS.md as canonical contract and loader.
- Core agents defined: spec-architect, agent-router, domain specialists, and pr-reviewer; agent files pin model and model_reasoning_effort.
- Spec tasks use strict template TASK-YYYY-MM-DD-###.spec.md with front matter (goal, scope_in, scope_out, constraints, validation, status).
- Workflow enforces checks via .codex/hooks/workflow-guard.sh and records evidence at .codex/evidence/agent-chain/<spec-id>.json; validation step uses npm run verify.
Connected Companies & Entities
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