Codex Knowledge Base
Codex: an agentic software engineering knowledge base
A continuously updated knowledge base for Codex, covering agentic software engineering workflows, configuration and real-world integration. New articles publish as the tool evolves.
This knowledge base complements the book Codex CLI: Agentic Engineering from First Principles. The map above is the book's framework — every article here goes deeper on a piece of it.
Get the bookOvereager Coding Agents: What 7,500 Benign Runs Reveal About Unauthorised Scope Expansion — and How Codex CLI's Approval and Sandbox Architecture Stops It
Overeager Coding Agents: What 7,500 Benign Runs Reveal About Unauthorised Scope Expansion — and How Codex CLI’s Approval and Sandbox Architecture Stops It
Mixed-Model Agent Teams: What AgentCARD Reveals About Role Bottlenecks — and How to Wire Heterogeneous Workflows in Codex CLI
AgentCARD's Shapley diagnostics show heterogeneous agent teams beat homogeneous setups by up to 44% accuracy or 12× lower cost. Here is how to replicate that advantage with Codex CLI named...
Correct Code, Vulnerable Dependencies: Why Your LLM Pins Dangerous Library Versions — and How Codex CLI's Hook and Governance Stack Stops Them Shipping
Correct Code, Vulnerable Dependencies: Why Your LLM Pins Dangerous Library Versions — and How Codex CLI’s Hook and Governance Stack Stops Them Shipping
Token Budget Overruns: What 63 Production Incidents Reveal About Runaway Agent Costs — and How Codex CLI's Rollout Budget Stops the Bleed
Token Budget Overruns: What 63 Production Incidents Reveal About Runaway Agent Costs — and How Codex CLI’s Rollout Budget Stops the Bleed
Structural Codebase Indexing: Why grep Is Not Enough — and How to Wire a Knowledge-Graph MCP Server into Codex CLI
Structural Codebase Indexing: Why grep Is Not Enough — and How to Wire a Knowledge-Graph MCP Server into Codex CLI
Sleeper Attacks on LLM Agents: What Plant-Persist-Trigger Reveals About Persistent State Poisoning — and How Codex CLI's Sandbox, Hook, and Memory Isolation Architecture Defends Against It
Sleeper Attacks on LLM Agents: What Plant-Persist-Trigger Reveals About Persistent State Poisoning — and How Codex CLI’s Sandbox, Hook, and Memory Isolation Architecture Defends Against It
Record and Replay: Programming by Demonstration Comes to Codex — and What It Means for the Open Agent Skills Standard
Record and Replay: Programming by Demonstration Comes to Codex — and What It Means for the Open Agent Skills Standard
Reasoning Effort, Not Tool Access, Buys First-Try Reliability: What 90 Agent Runs Reveal — and How to Configure Codex CLI's Reasoning Levels
Reasoning Effort, Not Tool Access, Buys First-Try Reliability: What 90 Agent Runs Reveal — and How to Configure Codex CLI’s Reasoning Levels
Prompt-Layer Complexity: What Hecate's 52 Metrics Reveal About the Maintenance Burden Traditional Tools Miss — and How to Measure Your Codex CLI Configuration Stack
Prompt-Layer Complexity: What Hecate’s 52 Metrics Reveal About the Maintenance Burden Traditional Tools Miss — and How to Measure Your Codex CLI Configuration Stack
Performance-Optimisation Benchmarks Are Unreliable: What a 740-Task Audit Reveals About Measurement Noise — and How to Build Trustworthy Profiling Workflows in Codex CLI
Performance-Optimisation Benchmarks Are Unreliable: What a 740-Task Audit Reveals About Measurement Noise — and How to Build Trustworthy Profiling Workflows in Codex CLI