Codex Knowledge Base
Codex CLI Plugin Ecosystem: Building, Distributing, and Managing Marketplace Plugins
Since v0.117.0 landed on 26 March 2026, Codex CLI has treated plugins as a first-class workflow primitive . What previously required separate MCP server.
Codex CLI Multi-Provider Resilience: Failover Chains, Account Pooling, and the Art of Uninterrupted Agent Sessions
Rate limits are the silent killer of deep-focus agent sessions. You are forty minutes into a complex refactoring loop, the model has built up a rich.
Codex CLI Model Catalogue Architecture: Providers, Discovery, and Debugging Model Resolution
When Codex CLI launches a session, it must resolve which model to use, where to send inference requests, and what capabilities that model supports — context.
Codex CLI MCP Sandbox-State Metadata: Building Context-Aware Tool Servers
MCP servers connected to Codex CLI traditionally operate without knowledge of their execution context. A database migration tool behaves identically whether.
MCP Parallel Tool Calls in Codex CLI: Unlocking Concurrent Execution with supports_parallel_tool_calls
Since v0.121.0, Codex CLI has shipped a quietly powerful configuration flag for MCP servers: supports_parallel_tool_calls. When enabled, it allows tools.
Codex CLI Config Lockfiles: Reproducible Agent Sessions with Export, Replay, and Drift Detection
Every senior engineer has encountered the it worked on my machine problem with build tools.
The Goblin Incident: What Reward Signal Leakage in GPT-5.5 Teaches Codex CLI Practitioners
On 28 April 2026, Google engineer Barron Roth noticed something odd in his Codex CLI sessions: the model kept inserting the word goblin into code.
WebSocket Mode in Codex CLI: How Persistent Connections to the Responses API Cut Agent Loop Latency by 40%
Every Codex CLI session is, at its core, a tight loop: send context to the Responses API, receive a model response, execute any requested tool calls, feed.
Codex CLI Sandbox Internals: How Seatbelt, Bubblewrap, Landlock and Windows DACL Keep Agent Commands in Check
When Codex CLI runs a shell command on your behalf, it does not simply call exec and hope for the best. Every command executes inside a platform-native.
Codex CLI Non-Interactive Pipelines: Production Automation with exec, resume, and Structured Output
The interactive TUI gets all the attention, but codex exec is where Codex CLI earns its keep in production.