Codex Knowledge Base
TDAD and Graph-Based Test Impact Analysis: Cutting Codex CLI Regressions by 70%
Autonomous coding agents resolve issues faster than most developers expect. What they also do — with uncomfortable regularity — is break things that already.
Memory Lifecycle Management: Create, Consolidate, Clean, Delete in Codex CLI
Since v0.100.0, Codex CLI has shipped a persistent memory system that retains facts, preferences, and project context across sessions.
MCP Tool Namespace Unification: Fixing the Silent Tool-Not-Found Bug
If you ran a multi-server MCP configuration in Codex CLI prior to v0.121.0, you may have encountered a particularly frustrating class of bug: the model.
Language Doesn't Matter Anymore: What Kent Beck's Shift Means for Coding Agents
Kent Beck — creator of Extreme Programming, co-author of the Agile Manifesto, pioneer of Test-Driven Development.
GitHub Agent HQ Model Selection: Choosing GPT-5.4 vs GPT-5.3-Codex, Custom Agents, and the Multi-Agent GitHub Workflow
GitHub's Agent HQ — the platform that lets developers assign coding tasks to Copilot, Claude, and Codex directly from issues, pull requests, and the Agents.
Codex CLI as a Unix Citizen: Prompt-Plus-Stdin, Shell Pipelines, and Composable Agent Workflows
The Unix philosophy — small tools, text streams, composable pipelines — has survived every paradigm shift in computing for half a century.
Codex CLI at One Year: From Research Preview to 3 Million Weekly Active Users
On 16 April 2025, OpenAI quietly released an open-source terminal coding agent called Codex CLI.
Agent Identity Stack Complete: Cryptographic Attribution for Multi-Agent Audit Trails
Codex CLI v0.121.0, released today, ships two PRs that introduce a use_agent_identity feature flag and the ability to register agent identities behind it .
Gemini CLI Subagents: Multi-Agent Orchestration Arrives
Source: Google Developers Blog Author: Google Published: 2026-04-15 Content age: Current — announced April 15, 2026 Tags: gemini-cli, subagents,.
Codex CLI Hooks: Complete Guide to Events, Policy Engines and Production Patterns
The definitive reference for Codex CLI hooks -- architecture, all five hook event types (SessionStart, PreToolUse, PostToolUse, UserPromptSubmit, Stop), the JSON wire protocol, policy-engine patterns, production examples for gates, auditing,...