Here is a complete, pasteable baseline for `~/.codex/config.toml`. It preserves maximum root-agent reasoning while preventing inherited Ultra behavior and strongly discouraging FullHistory forks. # ~/.codex/config.toml # Root-agent defaults. model = "gpt-5.6-sol" model_reasoning_effort = "max" # Keep planning capable without enabling Ultra orchestration. plan_mode_reasoning_effort = "high" model_reasoning_summary = "auto" model_verbosity = "medium" # Conservative execution defaults. Preserve your existing values if preferred; # these settings do not affect context hydration. approval_policy = "on-request" sandbox_mode = "workspace-write" # There is currently no hard config option for the default fork_turns value. # These instructions therefore make explicit, isolated forks the policy. developer_instructions = """ Multi-agent delegation policy: - Do not spawn subagents unless the task contains at least two independent workstreams and delegation materially improves the outcome. - Every spawn_agent call must set fork_turns explicitly; never rely on its default. - Use fork_turns: "none" by default. - Use a small positive fork_turns value only when the child needs specific recent decisions. - Use fork_turns: "all" only when the full retained conversation is essential to completing the delegated task. - Never select reasoning_effort: "ultra" for a subagent. - Subagents must not spawn further subagents unless the user explicitly requests recursive delegation. - Reuse an existing subagent for follow-up work instead of spawning a replacement when practical. """ [agents] enabled = true # Keeps child quality equivalent to the root without inheriting Ultra's # proactive delegation behavior. default_subagent_model = "gpt-5.6-sol" default_subagent_reasoning_effort = "max" # At most two spawned-agent threads may be open concurrently. # This excludes the primary/root thread. max_concurrent_threads_per_session = 2 # Preserve visible interruption records. interrupt_message = true The important hard controls are `default_subagent_reasoning_effort = "max"` and the concurrency cap; explicit spawn arguments can still override the child default. The `fork_turns` rules are advisory because Codex currently has no configuration key that changes its FullHistory default. These keys are documented in the official Codex configuration reference and implemented in config_toml.rs. If you intentionally want an Ultra root while preventing Ultra children, change only: model_reasoning_effort = "ultra" Keep: default_subagent_reasoning_effort = "max" That produces: Ultra root → proactive orchestration Max children → maximum reasoning, no inherited proactive mode For a cheaper child tier, change these two lines: default_subagent_model = "gpt-5.6-terra" default_subagent_reasoning_effort = "high" GPT-5.6’s official guidance recommends reserving `max` for the hardest quality-first workloads and comparing it against lower efforts for cost and latency. OpenAI model guidance For the absolute off switch: [agents] enabled = false [features] multi_agent_v2 = false Merge the baseline into your existing file instead of replacing it if you already have MCP servers, plugins, project trust entries, or permission profiles. Restart Codex and begin a new thread afterward; an existing resumed thread may retain its conversation-level Ultra selection.

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This is the initial 0.01 kernel as found on various history sites. Fun facts: - kernel/Makefile still calls it the FREAX kernel - this was in a more innocent age, when the only copyright notic...