Claude Code mod
eval-kernel
A persistent JavaScript kernel the model drives with one `eval` tool: state survives between cells, and cells call Claude Code tools, models and subagents.
Install
/plugin marketplace add kzarzycki/claude-mods
/plugin install eval-kernel@claude-modsMods install like plugins. Run /reload-plugins or start a new session to load it.
What it can access
- Reach
- L3Network: network, runs processes, drives Claude, draws, other: $.decision.ask
- Sees
- mcp__eval-kernel__eval calls, every tool call, every prompt
- Hooks
session.starttool.callprompt.submitturn.completecommand.run
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.
Details
- Repository
- kzarzycki/claude-mods
- Folder
plugins/eval-kernel- Marketplace
claude-mods- Type
- Workflow mods
- License
- NOASSERTION
- Last updated
- 28 October 2026
- Listed in
- awesome-claude-code-mods
FAQ
What is eval-kernel?
A persistent JavaScript kernel the model drives with one `eval` tool: state survives between cells, and cells call Claude Code tools, models and subagents. It is a mod for Claude Code, from kzarzycki/claude-mods on GitHub.
What can the eval-kernel mod access?
Its widest reach is "network" (network, runs processes, drives Claude, draws, other: $.decision.ask). It sees mcp__eval-kernel__eval calls, every tool call, every prompt. Like any mod, it runs with your permissions.
How do I install eval-kernel?
Inside Claude Code (v2.1.287 or later), run /plugin marketplace add kzarzycki/claude-mods and then /plugin install eval-kernel@claude-mods.
Is eval-kernel popular?
kzarzycki/claude-mods has 1 GitHub stars and 0 forks, and is included in 1 curated Claude Code list. It was last updated on 28 October 2026.
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