Codex and Claude Code can be part of one workflow, but their native hooks do not, by themselves, make one agent wake and prompt the other. A hook runs at a defined point in its own agent’s lifecycle; turning that event into a real handoff requires an additional mechanism that starts or messages the receiving process and passes it usable context.
That distinction matters: a desktop alert, an agent lifecycle callback, a cross-process invocation, and a background task are different things. The official documentation describes each product’s automation options, but does not establish a built-in Codex-to-Claude Code or Claude Code-to-Codex wake-up. So a claim that the agents collaborated through a specific setup needs to identify the actual trigger, handoff, receiver, and result—not just the hook.
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What “collaboration” needs to mean
For a cross-agent workflow to count as a handoff, one agent’s work must cause the other to receive a task or message, along with enough context to act. A notification that tells a person an agent needs attention is useful, but it is not an agent-to-agent handoff. Likewise, a hook firing proves that lifecycle logic ran; it does not prove that a second interactive session was started or resumed.
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A concrete workflow can be described as a sequence:
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- Event: name the lifecycle event or external condition that starts the action.
- Hook or trigger: identify the callback or mechanism that detects it.
- Handoff: state what invokes the other process or delivers the message.
- Recipient: explain where the receiving agent runs and what happens if it is unavailable.
- Context and result: specify what task information crosses the boundary and what the receiver does with it.
Without the handoff and recipient steps, the accurate description is automation or notification—not verified cross-agent collaboration.
What Claude Code hooks do—and do not do
Anthropic describes Claude Code hooks as a way to run deterministic logic at points in the agent lifecycle. Its documented examples include SessionStart for loading context, PreToolUse for logging, PostToolUse for actions such as formatting after edits, PermissionRequest for routing permission requests, Stop for checks or nudges, and PostCompact for re-injecting instructions. See Anthropic’s Claude Code power-user tips and its Claude Code FAQ.
The FAQ describes hooks as shell scripts triggered by events, including when Claude is waiting for input. A Notification hook can ping the desktop when Claude needs input. That is an alert for a person; it does not establish that Codex receives a prompt, that another Claude Code session starts, or that either agent can resume the other’s interactive session.
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What Codex hooks and background work cover
Codex can load lifecycle hooks from plugins as well as from user, project, and managed configuration. The hook scripts must exist in the environment where Codex executes; installing a plugin on the web does not deploy its scripts into that environment. Plugin-bundled hooks also are not automatically trusted: Codex skips them until the user reviews and trusts the current definition. The details are in OpenAI’s plugin packaging documentation.
OpenAI separately documents multi-agent tools in the Codex CLI, which let agents open, read, or fork other tasks. Codex Cloud tasks run on OpenAI-managed computers and can continue while the user’s computer is asleep. Those capabilities have different execution models: CLI task coordination is not the same thing as a Claude Code session receiving a prompt, and cloud execution is not a cross-product wake-up. Cloud access and plan eligibility can vary, so check the current workspace and plan before relying on it. See OpenAI’s Codex plan and usage information.
A shared plugin is not a messaging bridge
OpenAI documents an OpenAI Developers plugin that can be used with both Codex and Claude Code. Its Claude Code adaptation includes portable developer skills and the public OpenAI Docs MCP server; it does not include the Codex-specific Platform connector. This is a shared way to access OpenAI developer resources, not evidence of general session-to-session messaging or a built-in wake-up path. See the OpenAI Developers plugin documentation.
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- A person should take over: use a notification to tell the person that input is needed. Do not treat the alert as delivery to another agent.
- Repeatable work should run at a lifecycle point: use a hook for deterministic automation within the process and environment where it is configured.
- One agent must assign work to the other: use an actual invocation or messaging layer that can reach the recipient and pass the task and relevant context. The cited product documentation does not specify a native cross-agent wake-up between Codex and Claude Code.
- Work must continue when a local machine is unavailable: consider the documented cloud task options, while checking which product, workspace, and plan provide access. A background task is not automatically a handoff to the other agent.
For any implementation, make the boundary explicit: where the trigger runs, what it invokes, what state it passes, what permissions are needed, and what happens if the receiving process is closed or the action fires more than once. These are implementation questions, not guarantees supplied by a lifecycle hook.
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