What is jev-eval-observer?
jev-eval-observer is a Claude Code mod by tamaratran that pass-through evaluation instrumentation; never changes tool results. It is listed under Interface and has 164 GitHub stars.
| Type | Claude code mod |
|---|---|
| Author | tamaratran |
| Repository | tamaratran/jev-pruner |
| Popularity | 164 GitHub stars |
| Category | Interface |
| Security | Low risk (84/100) |
| Rank | #100 of 5,272 Claude Code mods; #23 in Interface |
| License | MIT |
| Last commit | 2026-09-30 |
| Stars this week | +3 |
| Hooks | 5 events |
| Sees | Bash calls |
| Draws on | nothing |
Is jev-eval-observer safe to install?
jev-eval-observer scores 84/100 on the MCPMods security check: Low risk. Things to review: writes files or config. It passed 6 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 files or config | Review |
| Doesn't read environment variables | Pass |
| Only sees the events it hooks | Pass |
| Doesn't drive Claude | Pass |
| Validator reported problems | Note |
| Has an open-source license | Pass |
API calls in its code
| Call | What it means |
|---|---|
$.fs.write | writes files |
How do I install jev-eval-observer?
- 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/tamaratran/jev-pruner claude plugin validate ./jev-pruner/evals/observer
- Install it. Run this in your terminal, then /reload-plugins in an open session.
git clone https://github.com/tamaratran/jev-pruner && claude --plugin-dir ./jev-pruner/evals/observer
Or ask Claude to set it up
Paste this into Claude Code and it installs jev-eval-observer for you:
Install the "jev-eval-observer" Claude Code mod from https://github.com/tamaratran/jev-pruner/tree/main/evals/observer. Run claude plugin validate on it first and show me what it can access before you enable it.
More from tamaratran/jev-pruner
This repository has 2 Claude Code mods on MCPMods.
- fast-jev-output: Trim long Bash output with Jev before the model sees it (Claude Code plugin) (Review before installing)