Codex Knowledge Base
Google Agents CLI vs Codex CLI: Two Visions of Agent Development from the Terminal
This comparison hinges on a single architectural insight: Codex CLI IS the coding agent; Google Agents CLI builds agents ON Google Cloud. They occupy.
Secure MCP Tunnel: Connecting Codex CLI to Private MCP Servers Without Opening Inbound Ports
Enterprise teams running internal MCP servers — wrapping proprietary databases, CI systems, or compliance tools — face a persistent tension.
Red-Teaming Codex CLI Agents with Promptfoo: Adversarial Security Testing for Coding Agent Workflows
Most teams running Codex CLI in production have evals. Fewer have adversarial evals. The distinction matters: standard evals verify that the agent produces.
The Post-Google I/O Coding Agent Landscape: Codex CLI vs Antigravity 2.0 vs Jules V2 vs Claude Code vs Grok Build
Google I/O 2026 landed on 19 May and reshaped the terminal coding agent market overnight. Antigravity 2.0 replaced Gemini CLI, Jules V2 (Project Jitro).
Managed Agents in the Gemini API vs Codex Cloud Tasks: Agent-as-a-Service Showdown
At Google I/O 2026, Ali Çevik introduced Managed Agents in the Gemini API — a single API call that provisions an ephemeral Linux sandbox, drops in an agent.
GitHub Copilot CLI Agent vs Codex CLI: Same Model, Different Harness — Two Terminal Agents Compared
On 17 May 2026, GitHub quietly switched the default model for Copilot Business and Enterprise users to GPT-5.3-Codex — the same model that powers OpenAI's.
Gemini 3.5 Flash vs GPT-5.5 and codex-mini: Coding Model Benchmark Comparison After Google I/O 2026
Google I/O 2026 dropped Gemini 3.5 Flash on 19 May with a bold claim: it beats Gemini 3.1 Pro on coding benchmarks whilst running four times faster than.
Detached Subagent Patterns for Codex CLI: Context-Free Orchestration Beyond Built-in Fork Semantics
Codex CLI's built-in subagent system uses fork semantics: child agents inherit the parent's context window, sandbox policy, and runtime overrides .
codex doctor: The Diagnostics Command That Replaces Manual Log Archaeology
Before Codex CLI v0.131.0, diagnosing a broken installation meant spelunking through ~/.codex/log/codex-tui.log, manually inspecting auth.json token expiry.
Codex CLI v0.132.0 Release Guide: Python SDK Authentication, exec resume --output-schema, and Performance Gains
Codex CLI v0.132.0 shipped on 20 May 2026 with a release that prioritises two themes: making the Python SDK a proper first-class citizen for programmatic.