OpenAI Codex Adds Subagents And Custom Agents
OpenAI Codex announced general availability of subagents and custom agents on March 16, 2026, after a preview period behind a feature flag. The release includes default subagents named explorer, worker, and default, and supports custom TOML agent definitions in ~/.codex/agents/ that can bind to specific models including gpt-5.3-codex-spark. The feature formalizes modular, parallel coding workflows and aligns Codex with similar subagent architectures across other platforms.
Key Points
- 1Announces GA of subagents for Codex with default explorer, worker, and default roles
- 2Enables modular task delegation and parallel execution, supporting many small tasks in coding workflows
- 3Allows developers to assign model-specific agents (e.g., gpt-5.3-codex-spark) for faster code automation
Scoring Rationale
Official GA delivers practical agent workflows and model binding, but analysis is shallow and default-role differences remain unclear.
Sources
Public references used for this report.
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