Codex Workspace Filter

Patches the OpenAI Codex VS Code extension so thread/list requests are filtered by the current VS Code workspace folders.

This is a smaller replacement for codex-home-autopatch. It does not change CODEX_HOME, split storage, or require session migration.

Behavior

• Workspace open: Recent Tasks and native session picker surfaces show sessions for the current workspace folder or folders.
• No workspace open: Codex keeps showing the normal global ~/.codex history.
• Existing sessions stay in the shared Codex home.
• codex CLI usage is unchanged.

How It Works

Codex already records cwd for sessions, and thread/list already accepts a cwd filter as a string or an array of strings.

This extension patches three thread/list call sites in the OpenAI Codex VS Code extension:

1. Main Codex Recent Tasks webview bridge.
2. Native VS Code ChatSession provider.
3. Conversation preview loader.

The injected filter uses the Codex extension's existing workspace-root helper, so it follows the same path normalization behavior as Codex itself.

On patch, this extension writes an exact backup next to the Codex extension entrypoint:

out/extension.js.codex-workspace-filter.bak

If this extension is disabled or uninstalled, the injected bootstrap restores that backup and restarts the extension host.

Scope

Important: use only global Enable/Disable for this extension. Do not use workspace-specific Enable/Disable. The extension must run in the workspace/remote extension host, but the patch itself affects the installed OpenAI Codex extension in that extension host.

The patch is reapplied after Codex extension updates overwrite out/extension.js.