Claude Code mod

session-guard

同じ作業ディレクトリで動く別の Claude Code セッションを検出し、workspace への移行を促す function hook

Guard & safety mods Plugin marketplaceValidates on Claude Code 2.1.316 Source

Install

Inside Claude Code

/plugin marketplace add UtakataKyosui/utakata-cc-mod
/plugin install session-guard@utakata-cc-mod

Mods install like plugins. Run /reload-plugins or start a new session to load it.

What it can access

Reach: L2Writes or runs: runs processes, reads files
Sees: classic hooks
Hooks: classic.SessionStart

From a static scan of the mod's code by awesome-claude-code-mods. It shows what the code asks for, not a security review.

How Claude Code mods work

A mod is a plugin with a JavaScript or TypeScript module that runs inside Claude Code (version 2.1.287 or later). It can draw panes beside the transcript, a band above the prompt, buttons and toasts, restyle the spinner and tool rows, and watch or rewrite tool calls and prompts.
It installs like any plugin: add its marketplace with /plugin marketplace add owner/repo, then /plugin install name@marketplace.
Check what a mod can reach before installing: it runs with your permissions. Reach goes from drawing only, to reading files, to writing files or running processes, to the network. Run claude plugin validate on a clone to list its hooks and calls without running it.
Turn one off from the Installed tab in /plugin, or start Claude Code with --safe-mode to skip every customization for a session.

Claude Code docs

Details

Repository: UtakataKyosui/utakata-cc-mod
Folder: plugins/session-guard
Marketplace: utakata-cc-mod
Author: UtakataKyosui
Type: Guard & safety mods
License: MIT
Last updated: 25 October 2026
Listed in: awesome-claude-code-mods

FAQ

What is session-guard?

同じ作業ディレクトリで動く別の Claude Code セッションを検出し、workspace への移行を促す function hook It is a mod for Claude Code, from UtakataKyosui/utakata-cc-mod on GitHub.

What can the session-guard mod access?

Its widest reach is "writes or runs" (runs processes, reads files). It sees classic hooks. Like any mod, it runs with your permissions.

How do I install session-guard?

Inside Claude Code (v2.1.287 or later), run /plugin marketplace add UtakataKyosui/utakata-cc-mod and then /plugin install session-guard@utakata-cc-mod.

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