Codex Knowledge Base
Agent Identity in Codex CLI: The use_agent_identity Feature Flag, Biscuit Tokens, and Verified Multi-Agent Trust
Multi-agent architectures have an attribution problem. When three subagents collaborate on a pull request.
Evaluating Codex CLI Agents with Promptfoo: Trajectory Assertions, Cost Guards, and Structured Grading
Standard LLM evals check whether a model returns the right text. Agent evals are a different beast entirely: two agents can produce identical final outputs.
The Three-CLI Toolkit: Running Codex CLI, Claude Code, and Gemini CLI as a Unified Development Stack
The terminal AI coding agent market has consolidated around three big-lab native tools: OpenAIs Codex CLI, Anthropics Claude Code.
Karpathy's LLM Knowledge Bases: The Same Flywheel We've Been Running for Six Weeks
On April 11, 2026, Andrej Karpathy posted a detailed description of his workflow for building personal knowledge bases with LLMs. He described raw data.
Legacy Model Retirement: Migration Guide for the April 14 Deadline
On April 7, OpenAI removed six legacy models from the Codex model picker. On April 14, these models will be fully removed for ChatGPT sign-in users.
MCP Maturation in Codex CLI: Resource Reads, OutputSchema, Elicitations, and the Full Tool Surface
When Codex CLI first shipped MCP support, it was a tools-only affair — connect a server, call its tools, move on. Resources were ignored or caused outright.
The Codex CLI Ecosystem Map: Navigating 245+ Community Tools, Skills and Subagents
Twelve months ago, Codex CLI was a single binary with a handful of configuration options. Today, a curated list on the official OpenAI Codex GitHub.
The codex-core Crate Extraction: How v0.119.0 Modularised the Rust Heart of Codex CLI
When OpenAI released Codex CLI v0.119.0 on 10 April 2026, the headline features were WebRTC voice sessions, expanded MCP Apps support, and the experimental.
Background Agent Streaming: From Fire-and-Forget to Observable Multi-Agent UX
Until v0.120.0, Codex CLI's multi-agent delegation followed a fire-and-forget pattern.
MCP Tool Namespacing and Wall Time Tracking in Codex CLI
Update (April 15): PR #17404 (tool namespacing) has now merged (April 15, 13:03 UTC). All MCP tools are registered with consistent namespace format.