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Codex CLI engineering workflows and the Model Context Protocol (MCP) in practice.
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Codex
12 articlesCodex CLI 0.163.0, Explained: Daybreak On by Default, Instant Interrupts, /config Search
The 0.163 preview line closes into a stable release: Daybreak on by default for eligible accounts, instant interrupts by default, /config preference search, a leader key, parallel read-only tools — and the bundled zsh is gone.
Read articleCodex CLI 0.156–0.162, Explained: Voice by Default, GPT-6.1 Sol as Default Model, Worktrees and Command Center
Seven stable releases since our 0.155 coverage: voice on by default, GPT-6 Sol/Luna, GPT-6.1 Sol as default model, MCP OAuth client secrets, Git worktree tools, Command Center pinning — mapped against the official release notes.
Read articleCodex Cloud Setup: Environments, Cloud Tasks, and the codex cloud CLI
Codex Cloud (called Codex Web in the source) is the hosted Codex surface: tasks run in cloud environments organized per GitHub repo, and the codex cloud CLI submits, tracks, and pulls diffs back to your machine.
Read articleCodex CLI config.toml: The Complete Guide to Models, Approvals, MCP and Layered Config
Codex CLI centers on ~/.codex/config.toml: model picks the model, approval_policy gates prompts, sandbox_mode sets boundaries, mcp_servers wires tools, profiles switch scenarios.
Read articleCodex CLI Sandbox Modes: sandbox_mode and approval_policy Explained
Codex CLI sandbox has four levels — read-only, workspace-write, external-sandbox, danger-full-access — plus a separate approval_policy axis. Every value checked against the codex source enums.
Read articleCodex CLI 0.155, Explained: Experimental /voice, Touch ID for MCP Requests, and the 0.155.1 Revert
Codex CLI 0.155.0/0.155.1 back to back: experimental /voice behind /experimental, streaming reasoning summaries, Touch ID for MCP requests, daemon update schedules, Bedrock credentials — plus the 0.155.1 reasoning-summary revert.
Read articleCodex CLI 0.154.0 and SDK 0.154.0: Worktrees, ExternalMessage, and the ultra Reasoning Effort
Codex CLI 0.154.0 (2026-09-09) ships experimental worktrees, inline Q&A, a shared Windows server, and drops the mcp-server entry point; SDK 0.154.0 adds max/ultra efforts and ExternalMessage. Voice is build-side only.
Read articleCodex CLI vs IDE Extension vs Codex Cloud: Choosing a Codex Surface
Codex ships in three surfaces -- local terminal, IDE extension, and cloud. This guide compares execution environment, sandbox and approvals, automation, and scenarios, with a migration view for Cursor users.
Read articleCodex CLI vs Cursor vs Aider vs Claude Code: 2026 AI coding tools compared
Codex CLI / Cursor / Aider / Claude Code side-by-side: positioning, model support, UI/UX, CI fit, cost curve, migration cost. Decision matrix for teams and individual developers.
Read articleCodex CLI in GitHub Actions: production-grade CI integration
Plug Codex CLI into GitHub Actions for automatic PR review / test generation / doc sync. Covers OAuth vs API-key auth, npm caching, worktree concurrency isolation, audit and budget guardrails.
Read articleCodex Team Workflow: worktrees, reviews, and CI integration
How to use Codex CLI in a team without breaking things: independent git worktrees, diff review, CODEOWNERS, CI integration, sensitive-path whitelist, and PR review checklist.
Read articleGetting started with OpenAI Codex CLI: from install to daily use
A practical guide to installing OpenAI's Codex CLI, configuring auth, shipping your first change, and integrating it into daily coding.
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12 articlesCodex CLI MCP Servers: The Full mcp_servers Config Field Guide
Codex CLI wires MCP servers via [mcp_servers] in config.toml: command/args/env for stdio, url/bearer_token/http_headers for remote, plus timeouts, tool filters and OAuth.
Read articleMCP Apps Explained: Interactive UIs Rendered Inside Chat, Standardized as SEP-1865
MCP Apps (SEP-1865, Final): a server declares a ui:// resource, and hosts like Claude or VS Code Copilot render the interactive HTML inside the conversation. Mechanism, security model, SDK code, and host support.
Read articleThe Model Hardware Standard, explained: how MHS lets AI agents safely operate physical devices
A close reading of Anthropic's August 27 research preview of the Model Hardware Standard: standardized drivers, three control mechanisms including MCP, results from six research partners, and eight vendors building support.
Read articleMCP Client Features Today: Elicitation Stays, Roots and Sampling Deprecated (SEP-2577)
The 2026-07-28 spec reshuffled MCP client features: Roots and Sampling deprecated (SEP-2577, retained 12+ months) while Elicitation remains with a new URL mode -- status, deprecation context, and migration paths, clause by clause.
Read articleMCP stdio Transport Deep Dive: Message Framing, Process Lifecycle, and Backward Compatibility (2026-07-28 Spec)
The MCP stdio transport at spec level: newline-delimited JSON-RPC framing, the stdout/stderr boundary, cancellation and shutdown lifecycle rules, crash restarts, and backward-compatibility probing.
Read articleMCP Authorization Explained: How OAuth 2.1 Lands in MCP (2026-07-28 Spec)
The MCP authorization spec clause by clause: role mapping, RFC9728 discovery, three registration mechanisms, the iss validation table, resource parameters, token red lines, and the step-up authorization flow.
Read articleDebugging MCP in Practice: Inspector, Logging Rules, and the Connection Troubleshooting Chain
The official method for debugging MCP integrations: the Inspector UI as first stop, stdio vs Streamable HTTP logging rules (notifications/message deprecated in spec 2026-07-28), startup root causes, and a five-step connection chain.
Read articleMCP Security Guide: The 8 Official Attack Vectors and Their Mitigations
The official MCP security best practices, decoded: eight attack classes from Confused Deputy and Token Passthrough to SSRF and scope minimization, each with the official mitigation requirements.
Read articleMCP server development: protocol, debugging, security, and production deployment
MCP server production essentials: protocol deep-dive (JSON-RPC 2.0 / lifecycle / capabilities negotiation), Inspector debugging, transport selection (stdio / Streamable HTTP / SSE), security modes (prompt injection / OAuth scope / audit).
Read articleDeploy MCP Server to Cloudflare Workers: MCP at the Edge
Deploy MCP Server to Cloudflare Workers: stdio to Streamable HTTP conversion, Edge Runtime limits, KV persistence, wrangler config, and a production checklist.
Read articleBuild Your Own MCP Server: From Zero to Published
Build and ship an MCP Server with @modelcontextprotocol/sdk: project setup, declaring tools, choosing stdio vs Streamable HTTP, local testing, OAuth, and a launch checklist.
Read articleModel Context Protocol: how MCP works and how to build on it
What MCP is, how it standardizes tool calling for LLMs, and how to build an MCP server that exposes your data or APIs to ChatGPT, Claude, and Cursor.
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