OpenAI · 2026-09-01 · notable
Codex CLI 0.152.0 — the planning tool is now off by default
Codex CLI 0.152.0 disables the update_plan planning tool by default; you switch it back on with tools.update_plan.enabled = true. The release also adds search inside drafts in Vim mode and per-tool output limits for MCP servers.
Codex CLI 0.152.0 turns the planning tool off by default and tightens how MCP tools return output.
What is it?
The planning tool is disabled by default in Codex CLI 0.152.0, released September 1, 2026. Anyone who relied on the agent writing plans has to opt back in by setting `tools.update_plan.enabled = true`. Vim mode also picks up `/` and `?` search inside drafts, with highlighted matches and `n` / `N` to step through them.
How does it work?
A per-tool `output_token_limit` setting now caps what an individual MCP tool can return, and the same truncation is applied when a session resumes. MCP server names accept `:`, `@`, `/` and `.`, so package-style names work across CLI commands and authentication. App-server clients can set `thread/shellCommand` timeouts, including deadlines longer than an hour.
Why does it matter?
Long agent runs get the practical fixes in this release: cloud task requests reject untrusted backend URLs and refuse redirects, which protects saved credentials, and automatic approval reviews keep user instructions, answers and valid authorizations across history compaction. Rate-limit banners now offer direct actions for checking usage, managing credits and resetting limits.
Who is it for?
developers using the Codex terminal agent