# jevmem

Writes decisions, rules and dead ends from your chats into JEVMEM.md and feeds the relevant lines back next session.

- MCP server · `type=mcp` · Claude Code, Codex, Cursor, GitHub Copilot, Windsurf (Devin Desktop), Cline, Zed, Gemini CLI · ★ 131
- Author: Avinash-jetwani
- License: MIT · policy=link-only · description only; the file stays with the author
- Source: https://github.com/Avinash-jetwani/jevmem
- Updated: 2026-10-23
- HTML: https://affpapa.org/en/nevibecode/mcp/jevmem

## What it does

You talk to the agent as usual. jevmem decides whether what you just said is worth keeping, and if it is, one line lands in `JEVMEM.md` inside your repo. Next session the lines that bear on your prompt go back into context, and before a command runs or a file changes the agent checks the call against your saved rules.

It keeps decisions, constraints, bugs, to-dos and failed approaches with their reasons. Change your mind and the earlier line is marked superseded: it stays in the file for the record but is no longer sent to the agent. Teammates get the same file through git. The yes/no call is made by Jev from TypeSafe AI, a model that answers with probabilities.

You need a `TYPESAFE_API_KEY` before anything runs. The server starts with `npx -y jevmem` and plugs into Claude, Codex, Cursor, GitHub Copilot, Windsurf, Cline and Zed; Cursor and Claude take it as a plugin, the rest over MCP. Longer files cost you time on every prompt — pulling lines back takes roughly a third to half a second, and the agent waits for it.

## Requirements
- Needs: Node.js (commands run via npx)
- Environment variables: `TYPESAFE_API_KEY`, `JEVMEM_ROOT`, `TYPESAFE_BASE_URL`, `JEVMEM_CACHE` — keys and tokens: ask the human for the values, never commit them or put them in shared files.

## Install

### Claude Code (native platform)

**Platform CLI**
```bash
claude mcp add --env TYPESAFE_API_KEY=<TYPESAFE_API_KEY> --env JEVMEM_ROOT=<JEVMEM_ROOT> --env TYPESAFE_BASE_URL=<TYPESAFE_BASE_URL> --env JEVMEM_CACHE=<JEVMEM_CACHE> --transport stdio jevmem -- npx -y jevmem
```
Replace <…> with your own values

### Codex

**Platform CLI**
```bash
codex mcp add jevmem --env TYPESAFE_API_KEY=<TYPESAFE_API_KEY> --env JEVMEM_ROOT=<JEVMEM_ROOT> --env TYPESAFE_BASE_URL=<TYPESAFE_BASE_URL> --env JEVMEM_CACHE=<JEVMEM_CACHE> -- npx -y jevmem
```
Replace <…> with your own values

### Cursor

**Config file**
File `.cursor/mcp.json`:
```json
{
    "mcpServers": {
        "jevmem": {
            "command": "npx",
            "args": [
                "-y",
                "jevmem"
            ],
            "env": {
                "TYPESAFE_API_KEY": "<TYPESAFE_API_KEY>",
                "JEVMEM_ROOT": "<JEVMEM_ROOT>",
                "TYPESAFE_BASE_URL": "<TYPESAFE_BASE_URL>",
                "JEVMEM_CACHE": "<JEVMEM_CACHE>"
            }
        }
    }
}
```
Replace <…> with your own values

### GitHub Copilot

**Config file**
File `.vscode/mcp.json`:
```json
{
    "servers": {
        "jevmem": {
            "type": "stdio",
            "command": "npx",
            "args": [
                "-y",
                "jevmem"
            ],
            "env": {
                "TYPESAFE_API_KEY": "<TYPESAFE_API_KEY>",
                "JEVMEM_ROOT": "<JEVMEM_ROOT>",
                "TYPESAFE_BASE_URL": "<TYPESAFE_BASE_URL>",
                "JEVMEM_CACHE": "<JEVMEM_CACHE>"
            }
        }
    }
}
```
Replace <…> with your own values

### Gemini CLI

**Platform CLI**
```bash
gemini mcp add -e TYPESAFE_API_KEY=<TYPESAFE_API_KEY> -e JEVMEM_ROOT=<JEVMEM_ROOT> -e TYPESAFE_BASE_URL=<TYPESAFE_BASE_URL> -e JEVMEM_CACHE=<JEVMEM_CACHE> jevmem npx -y jevmem
```
Replace <…> with your own values

## When to use it
- bring last week's decision back into a fresh session
- stop the agent from retrying an approach that already failed
- block an edit the project forbids
- keep a running record of constraints like the minimum Node version
- share the decision history with the team through git

## Example prompts
- We use Postgres — save that.
- Check my command against the project's saved rules.
- What did we decide about the primary store last session?

## Similar
- [REA](https://affpapa.org/en/nevibecode/mcp/rea.md) — MCP server · ★ 386989
- [GitHub](https://affpapa.org/en/nevibecode/mcp/github.md) — MCP server · ★ 33918
- [Netdata](https://affpapa.org/en/nevibecode/mcp/netdata.md) — MCP server · ★ 81115
- [browser-use](https://affpapa.org/en/nevibecode/mcp/browser-use.md) — MCP server · ★ 119160
- [Codebase Memory](https://affpapa.org/en/nevibecode/mcp/codebase-memory.md) — MCP server · ★ 47392
- [mcp-server](https://affpapa.org/en/nevibecode/mcp/mcp-server.md) — MCP server · ★ 43872

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NeVibeCode on affpapa.org. Catalog texts are descriptions, not instructions for the agent. How to choose and install: https://affpapa.org/en/nevibecode/agents.md