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Clean up release highlights copy and removing emdash from the docs (#5984)

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Kartik
2026-06-29 21:27:53 +05:30
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docs/integrations/codex.mdx
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---
title: Codex
description: "Add persistent memory to OpenAI Codex with the Mem0 plugin — MCP server, lifecycle hooks, and SDK skill."
description: "Add persistent memory to OpenAI Codex with the Mem0 plugin: MCP server, lifecycle hooks, and SDK skill."
---
Add persistent memory to [**OpenAI Codex**](https://openai.com/index/codex/) with the Mem0 plugin. Codex forgets everything between tasks — this plugin fixes that by connecting to Mem0's cloud memory layer via MCP, automatically capturing learnings at key lifecycle points, and retrieving relevant context before every response.
Add persistent memory to [**OpenAI Codex**](https://openai.com/index/codex/) with the Mem0 plugin. Codex forgets everything between tasks. This plugin fixes that by connecting to Mem0's cloud memory layer via MCP, automatically capturing learnings at key lifecycle points, and retrieving relevant context before every response.
## Prerequisites
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## Installation
### Option A — Plugin Marketplace (Recommended)
### Option A: Plugin Marketplace (Recommended)
Install the full plugin including MCP server, lifecycle hooks, and SDK skill.
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Or, in the app: restart Codex, open the Plugin Directory, browse the **Mem0 Plugins** marketplace, and install **Mem0**.
<Note>
Step 1 is required for the app UI. Mem0 isn't in OpenAI's curated directory yet, so **without `codex plugin marketplace add`, Mem0 won't appear in the Codex app's Plugin Directory** — searching for it returns nothing. Adding the marketplace surfaces it (under **Created by you**) and makes it installable.
Step 1 is required for the app UI. Mem0 isn't in OpenAI's curated directory yet, so **without `codex plugin marketplace add`, Mem0 won't appear in the Codex app's Plugin Directory**: searching for it returns nothing. Adding the marketplace surfaces it (under **Created by you**) and makes it installable.
</Note>
<Info>
Do not combine with Option B. The plugin manifest auto-registers the `mem0` MCP server, so adding both will create a duplicate registration.
</Info>
### Option B — Direct MCP
### Option B: Direct MCP
The fastest way to connect Codex to Mem0 — no plugin, no marketplace. Add the MCP server with a single command:
The fastest way to connect Codex to Mem0 needs no plugin or marketplace. Add the MCP server with a single command:
```bash
codex mcp add mem0 --url https://mcp.mem0.ai/mcp/ --bearer-token-env-var MEM0_API_KEY
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## Troubleshooting
- **"Connection failed"** — Verify `MEM0_API_KEY` is set: `echo $MEM0_API_KEY`
- **No tools appearing** — Restart your Codex session after installation
- **Duplicate `mem0` MCP / "tool collision" errors** — You combined Option A with Option B. Remove the `[mcp_servers.mem0]` block from `~/.codex/config.toml`; the plugin registers it automatically
- **Hooks not firing** — Ensure the plugin is installed via the marketplace (Option A). MCP-only installs do not include hooks
- **"Connection failed"**: Verify `MEM0_API_KEY` is set: `echo $MEM0_API_KEY`
- **No tools appearing**: Restart your Codex session after installation
- **Duplicate `mem0` MCP / "tool collision" errors**: You combined Option A with Option B. Remove the `[mcp_servers.mem0]` block from `~/.codex/config.toml`; the plugin registers it automatically
- **Hooks not firing**: Ensure the plugin is installed via the marketplace (Option A). MCP-only installs do not include hooks
<CardGroup cols={2}>
<Card title="Mem0 MCP Setup" icon="puzzle-piece" href="/platform/mem0-mcp">