What is ciel-mode?
ciel-mode is a Claude Code mod by ruihe774. ciel-mode (Call-in-CEL mode) for Claude Code: the model writes a small sandboxed CEL program that calls MCP and read-only tools, filters and joins their results, and returns only what it. It is listed under Security and has 1 GitHub stars.
| Type | Claude code mod |
|---|---|
| Author | ruihe774 |
| Repository | ruihe774/cc-ciel-mode |
| Popularity | 1 GitHub stars |
| Category | Security |
| Security | Low risk (80/100) |
| Rank | #2,280 of 5,272 Claude Code mods; #270 in Security |
| License | Unlicense |
| Last commit | 2026-10-09 |
| Hooks | 5 events |
| Sees | /"^mcp__"/ calls, mcp__ciel-mode__run calls, mcp__ciel-mode__tools calls |
| Draws on | nothing |
Is ciel-mode safe to install?
ciel-mode scores 80/100 on the MCPMods security check: Low risk. Things to review: reads environment variables. It passed 5 of 8 checks.
Mod footprints come from claude plugin validate, which lists every event a mod hooks and every API call it makes without running it.
| Check | Result |
|---|---|
| No network access | Pass |
| Starts no processes | Pass |
| Writes no files or config | Pass |
| Reads environment variables | Review |
| Only sees the events it hooks | Pass |
| Drives Claude (model calls, prompts) | Note |
| Validator reported problems | Note |
| Has an open-source license | Pass |
API calls in its code
| Call | What it means |
|---|---|
$.command.register | |
$.env.get | reads env vars |
$.fs.read | reads files |
$.session.id | |
$.tool.call | drives Claude |
$.tool.check | |
$.tool.list | |
$.tool.register | drives Claude |
$.ui.ask | draws interface |
How do I install ciel-mode?
- Check your Claude Code version. Mods need Claude Code 2.1.287 or later and are on by default.
claude --version
- Read its footprint. This lists every event it hooks and every API call it makes, without running it.
git clone https://github.com/ruihe774/cc-ciel-mode claude plugin validate ./cc-ciel-mode/.
- Install it. Run this in your terminal, then /reload-plugins in an open session.
git clone https://github.com/ruihe774/cc-ciel-mode && claude --plugin-dir ./cc-ciel-mode/.
Or ask Claude to set it up
Paste this into Claude Code and it installs ciel-mode for you:
Install the "ciel-mode" Claude Code mod from https://github.com/ruihe774/cc-ciel-mode. Run claude plugin validate on it first and show me what it can access before you enable it.