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The Codex Changelog · August 29 · 6 min

Codex 0.151.0: Subagent Budgets and MCP Middleware

We break down Codex 0.151.0’s biggest agent-safety upgrades, including root-level token budgeting for subagents and middleware that can inspect, sanitize, or replace MCP tool output before it reaches the model. The episode also covers sandbox hardening fixes, permission profile preservation, Guardian cache invalidation, and startup grace period improvements.

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We break down Codex 0.151.0’s biggest agent-safety upgrades, including root-level token budgeting for subagents and middleware that can inspect, sanitize, or replace MCP tool output before it reaches the model. The episode also covers sandbox hardening fixes, permission profile preservation, Guardian cache invalidation, and startup grace period improvements.

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