Persistent memory for AI agents over MCP. Tell it a recalled memory helped or misled, and it re-ranks what comes back next. One key across Claude Code, Cursor, VS Code and ChatGPT.
@mnemoverse/mcp-memory-server is the MIT-licensed MCP server for the hosted Mnemoverse memory engine.
Mnemoverse is a hosted memory engine for AI agents, reached over the Model Context Protocol. Mnemoverse stores what your agents learn — decisions, preferences, lessons — and returns it in any connected tool, so one memory follows you across Claude Code, Cursor, VS Code and ChatGPT with a single API key. Mnemoverse re-ranks recall from outcomes: report that a recalled memory helped and a Rescorla-Wagner update on the prediction error raises it, report that it misled and it sinks — a different mechanism from similarity scoring, usable alongside it.
What is open source here, and what is not. This repository, the MCP server, is MIT, and so is the Python SDK. The memory engine they talk to is a hosted service with a free tier; there is no self-hosted build of the engine.
Most agent memory today lives in one of three places. Per-tool instruction files — CLAUDE.md, .cursorrules, AGENTS.md — are versioned and readable, but each copy belongs to one repo and one tool, and nothing follows you to the next window. A vector store behind RAG retrieves by similarity, and similarity never changes because advice helped or misled. Local-first memory servers win on privacy and latency, and ask you to run and update the infrastructure yourself. Mnemoverse is the managed, cross-tool option in that landscape: nothing to deploy, one key everywhere, and ranking that moves with reported outcomes. If you need memory inside your own perimeter, a local-first server is the better choice — this one is hosted by design.
The consolidation stage of the engine — HDBSCAN clustering with Von Restorff protection, so distinctive memories are not absorbed into the average — is designed in and currently switched off on the hosted service; our docs say so rather than hide it.
⭐ If Mnemoverse saves you from re-explaining context to your agents, star the repo. It helps other builders find it.
Sign up at console.mnemoverse.com — takes 30 seconds, no credit card.
Check the key before you put it in a config. Both forms ask for the key at a masked prompt and never pass it as a command argument, so it lands neither in your shell history nor in the process list.
macOS, Linux, Git Bash:
printf 'Mnemoverse API key: '; read -rs KEY; echo
printf 'X-Api-Key: %s\n' "$KEY" | curl -s -H @- https://core.mnemoverse.com/api/v1/memory/stats; unset KEYWindows PowerShell 5.1 and PowerShell 7:
$k = [Net.NetworkCredential]::new('', (Read-Host 'Mnemoverse API key' -AsSecureString)).Password
try { (Invoke-WebRequest https://core.mnemoverse.com/api/v1/memory/stats -Headers @{ 'X-Api-Key' = $k } -UseBasicParsing).Content }
catch { if ($_.ErrorDetails.Message) { $_.ErrorDetails.Message } else { (New-Object IO.StreamReader($_.Exception.Response.GetResponseStream())).ReadToEnd() } }; Remove-Variable k| The output contains | What it means |
|---|---|
JSON that includes "total_atoms" |
The key works. |
"reason":"placeholder_key" |
That is the example key from these docs. Create a real one at the console. |
"reason":"malformed_key" |
Not the shape of a key: cut short in the paste, wrapped in quotes, or a different token entirely. |
"reason":"invalid_key" |
The shape is right and no such key exists. Copy it again from the console. |
"reason":"revoked_key" |
The key was revoked and will not work again. Create a new one. |
"reason":"missing_key" |
No key reached the API: what you entered was empty. |
In the JSON, reason sits inside the details object (details.reason), next to details.keys_url, the console page where keys are created.
The two canonical setups, Claude Code and Cursor. Each writes the key once, at user scope, covering every project. Avoid a per-project config file for this: it lives inside the repository and can be committed with it, and a key belongs outside:
Claude Code — add via CLI:
claude mcp add mnemoverse -s user \
-e MNEMOVERSE_API_KEY=mk_live_YOUR_KEY \
-e MNEMOVERSE_API_URL=https://core.mnemoverse.com/api/v1 \
-- npx -y @mnemoverse/mcp-memory-server@latestOn Windows (PowerShell), paste the same command as one line — PowerShell does not read the \ line continuations:
claude mcp add mnemoverse -s user -e MNEMOVERSE_API_KEY=mk_live_YOUR_KEY -e MNEMOVERSE_API_URL=https://core.mnemoverse.com/api/v1 -- npx -y @mnemoverse/mcp-memory-server@latestCursor — click to install, or add the JSON below to ~/.cursor/mcp.json, the global config that covers every project. Do not put it in a project-level .cursor/mcp.json: that file lives inside the repository and is committed with it unless you exclude it, and this config holds your key.
The install button carries the placeholder key mk_live_YOUR_KEY, not yours, so the shortest path is to skip the button: add the JSON below to ~/.cursor/mcp.json, merging it with any servers already there, and put your own key in place. Get one at console.mnemoverse.com. If you did click the button, edit the same key in the mcp.json it wrote; Cursor keeps MCP environment values in that file, not in a settings form. Until the key is real the server starts and lists its tools, but every tool call is refused.
{
"mcpServers": {
"mnemoverse": {
"command": "npx",
"args": [
"-y",
"@mnemoverse/mcp-memory-server@latest"
],
"env": {
"MNEMOVERSE_API_KEY": "mk_live_YOUR_KEY",
"MNEMOVERSE_API_URL": "https://core.mnemoverse.com/api/v1"
}
}
}
}All other clients — VS Code, Windsurf, Zed, JetBrains, Cline, Continue
VS Code — the VS Code extension signs in through the browser and needs no key; that's the default path. In VS Code's non-interactive Agent Host mode, servers that prompt for inputs like this one are not started; for unattended use there, put the key in the environment of the process that launches VS Code instead. To wire the MCP server directly instead, add this to .vscode/mcp.json (note: VS Code uses servers, not mcpServers). Never put a literal mk_live_ key in that file — it's committed with the repo. The inputs entry below prompts for the key instead: VS Code masks what you type and stores it in its own secret storage, not in the file:
{
"inputs": [
{
"type": "promptString",
"id": "mnemoverse-api-key",
"description": "Mnemoverse API key (starts with mk_live_). Optional to install and inspect — the server starts and lists its tools without a key; every actual tool call requires one. Get one free in ~30s at https://console.mnemoverse.com",
"password": true
}
],
"servers": {
"mnemoverse": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@mnemoverse/mcp-memory-server@latest"
],
"env": {
"MNEMOVERSE_API_KEY": "${input:mnemoverse-api-key}",
"MNEMOVERSE_API_URL": "https://core.mnemoverse.com/api/v1"
}
}
}
}Windsurf — add to ~/.codeium/windsurf/mcp_config.json:
{
"mcpServers": {
"mnemoverse": {
"command": "npx",
"args": [
"-y",
"@mnemoverse/mcp-memory-server@latest"
],
"env": {
"MNEMOVERSE_API_KEY": "mk_live_YOUR_KEY",
"MNEMOVERSE_API_URL": "https://core.mnemoverse.com/api/v1"
}
}
}
}More MCP clients — same server, different config file:
Zed — add to ~/.config/zed/settings.json (Zed uses context_servers, and "source": "custom" is required):
{
"context_servers": {
"mnemoverse": {
"source": "custom",
"command": "npx",
"args": [
"-y",
"@mnemoverse/mcp-memory-server@latest"
],
"env": {
"MNEMOVERSE_API_KEY": "mk_live_YOUR_KEY",
"MNEMOVERSE_API_URL": "https://core.mnemoverse.com/api/v1"
}
}
}
}JetBrains (AI Assistant) — Settings → Tools → AI Assistant → Model Context Protocol (MCP), then paste:
{
"mcpServers": {
"mnemoverse": {
"command": "npx",
"args": [
"-y",
"@mnemoverse/mcp-memory-server@latest"
],
"env": {
"MNEMOVERSE_API_KEY": "mk_live_YOUR_KEY",
"MNEMOVERSE_API_URL": "https://core.mnemoverse.com/api/v1"
}
}
}
}Cline — MCP Servers → Configure (or edit cline_mcp_settings.json). Cline reads env values literally, so paste your real key — not a ${VAR} reference:
{
"mcpServers": {
"mnemoverse": {
"command": "npx",
"args": [
"-y",
"@mnemoverse/mcp-memory-server@latest"
],
"env": {
"MNEMOVERSE_API_KEY": "mk_live_YOUR_KEY",
"MNEMOVERSE_API_URL": "https://core.mnemoverse.com/api/v1"
}
}
}
}Continue — add ~/.continue/mcpServers/mnemoverse.yaml (Continue uses YAML):
mcpServers:
- name: mnemoverse
command: npx
args:
- "-y"
- "@mnemoverse/mcp-memory-server@latest"
env:
MNEMOVERSE_API_KEY: "mk_live_YOUR_KEY"
MNEMOVERSE_API_URL: "https://core.mnemoverse.com/api/v1"Why
@latest? Barenpx @mnemoverse/mcp-memory-serveris cached indefinitely by npm and stops re-checking the registry. The@latestsuffix forces a metadata lookup on every Claude Code / Cursor / VS Code session start (~100-300ms), so you always pick up new releases.
⚠️ Restart your AI client after editing the config. MCP servers are only picked up on client startup.
Paste this in your AI chat:
"Remember that my favourite TypeScript framework is Hono, and please call
memory_writeto save it."
Your agent should call memory_write and confirm the memory was stored.
Then open a new chat / new session (this is the whole point — memory survives restarts), and ask:
"What's my favourite TypeScript framework?"
Your agent should call memory_read, find the entry, and answer "Hono". If it does — you're wired up. Write whatever you want next.
If it doesn't remember: check that the client was fully restarted and the config has your real mk_live_... key, not the placeholder.
⭐ If the second session remembered, star the repo. It helps other builders find it.
| Tool | What it does |
|---|---|
memory_write |
Store a memory — insight, preference, lesson learned |
memory_read |
Search memories by natural language query (optional recency ordering, time bounds, author exclusion) |
memory_list_recent |
List newest memories first — no query; since/until bounds (inclusive) + cursor paging |
memory_feedback |
Rate memories as helpful or not (improves future recall) |
memory_stats |
Check how many memories stored, which domains exist |
memory_create_room |
Create a shared memory room; its address works as a domain on write/read |
memory_invite_to_room |
Mint an invite (code + link) for a room you own; single-use unless max_uses allows more |
memory_join_room |
Join a shared room with an invite code (mnvr_...) |
memory_list_rooms |
List rooms you own or joined, with each room's address to use as domain |
vault_list |
List Vault secrets by alias and purpose — the secret value is never returned |
Three named shortcuts for clients that show MCP prompts as commands (Claude Code as /mcp__mnemoverse__<name>). Each one only asks the model to use the tools above; none of them calls the API itself.
| Prompt | Arguments | What it asks for |
|---|---|---|
recall |
topic |
Search memory for a topic with memory_read and summarize only what comes back |
save_insight |
insight, optional domain |
Store an insight with memory_write and confirm what was stored |
what_do_you_know |
subject |
A briefing from memory_read that flags what is not stored |
memory://item/{memory_id} opens one saved memory by its id (the id: line of a memory_read result) for clients that attach MCP resources. It returns the memory's memory_id, content and domain as JSON. It reads your own store only: a memory read from a shared room cannot be opened by id.
tools/list is frozen per released version, so a client can save the list it
saw and diff it against what the server serves today, by version.
- Within a PATCH (x.y.Z): tool names, argument schemas and the
annotationsobject of every tool (title,readOnlyHint,destructiveHint,idempotentHint,openWorldHint) do not change. Only text may: descriptions and what a tool returns, as the CHANGELOG rules state. - Within a MINOR (x.Y.0): tools and annotation fields may be added, never removed or renamed, and no declared annotation field disappears or flips silently. Every addition has a line in the CHANGELOG under that version.
- Removing or renaming a tool or a tool's input parameter, or dropping or
renaming a declared annotation field, is announced one MINOR ahead: the
tool (or parameter) stays, its description says
deprecated since x.y, removed in x.z, and the change lands only in the announced version, with its CHANGELOG line. A renamed parameter is accepted under both names until then (0.11:memory_feedback'satom_idsbecamememory_ids). A rename is announced by naming both the old and the new name; the version pair alone does not say what a client should look for. Because a MINOR may add a field but not remove one, a renamed annotation field is declared under both names until the announced version. - Any difference between two servers of the same version is a bug. Report it
with both
tools/listoutputs.
The list above is the 0.10 surface: ten tools, each declaring all four hints.
The hosted connector at mcp.mnemoverse.com/mcp serves the same ten.
If the hosted connector stops answering in a session. A client can keep showing the connector as connected while every call in that session fails with "not connected". Reconnecting it on claude.ai does not revive a session that is already stuck; reconnect from inside the session instead (in Claude Code, /mcp, then sign in again). Meanwhile this local server, set up with an API key from the same account as in the Quick Start, reaches the same memory and does not depend on that session's sign-in.
The pattern that pays off first is cross-tool continuity: a decision made while pairing in Claude Code is there when you open Cursor an hour later, and the preference you stated in VS Code holds in a ChatGPT session that evening. Teams use shared rooms the same way — one place where an agent's lessons about a codebase accumulate instead of being re-taught per seat. And because recall re-ranks from feedback, the memories that keep proving useful surface first, which matters once a store grows past what anyone curates by hand.
Concrete things worth writing:
- User preferences: "I use dark mode", "I prefer Tailwind over CSS modules"
- Project context: "This project uses PostgreSQL + Prisma", "Deploy to Railway"
- Lessons learned: "Always run tests before push on this repo"
- Decisions made: "We chose REST over GraphQL because of caching simplicity"
- People & roles: "Alice is the designer, Bob owns the API"
- Past mistakes: "Don't deploy on Fridays — learned this the hard way"
The same API key works across all tools. Write a memory in Claude Code — read it in Cursor. Learn something in VS Code — your GPT Custom Action knows it too.
┌── Claude Code (this MCP server)
├── Cursor (this MCP server)
Mnemoverse API ──├── VS Code (this MCP server)
(one memory) ├── GPT (Custom Actions)
├── Python SDK (pip install mnemoverse)
└── REST API (curl)
| Env Variable | Required | Default |
|---|---|---|
MNEMOVERSE_API_KEY |
For every tool call — the server starts and lists its tools without one | — |
MNEMOVERSE_API_URL |
No | https://core.mnemoverse.com/api/v1 |
The retrieval model is published: arXiv:2603.08965, accepted at the GRAAI workshop at IEEE WCCI 2026 — it establishes the abstraction-discovery method the memory model builds on. No benchmark figures appear in this README, ours or anyone's: numbers will come with a reproducible run to stand behind, not before.
Setup and reference
- Documentation
- Cursor · VS Code · Claude Code · ChatGPT
- Python SDK
- API Reference
- Console (get API key)
Background reading
- Memory MCP servers compared — thirteen shipping options, with pricing and registry presence
- How to choose a memory MCP server — the five questions that narrow the field
- What AI agent memory is — the category explained
- Is this a vector database? — what makes a memory layer different
- Shared memory for multi-agent systems — how Rooms work and when to use them
Other ways to install it
The same memory, packaged for hosts that prefer a plugin or an extension over an MCP config block. How each one connects and authenticates differs, so the line below says which is which rather than claiming one flow for all of them.
- Claude Code plugin — remote endpoint over MCP with an OAuth sign-in, no key to paste. Bundles the
agent-memory-disciplineskillclaude plugin marketplace add mnemoverse/claude-plugin claude plugin install mnemoverse@mnemoverse - Cursor plugin — same remote endpoint, same sign-in
- Gemini CLI extension — same remote endpoint.
gemini extensions install https://github.com/mnemoverse/gemini-extension - VS Code extension — signs in through the browser, with pasting a key kept as a fallback command
- Desktop extension:
manifest.jsonin this repository is an MCPB manifest. This one is different from the four above: it runs the server as a localnodeprocess and readsMNEMOVERSE_API_KEYfrom the extension settings rather than calling the hosted endpoint. The packaged.mcpbships with each release
Standing rules, separate from this server
- agent-memory-discipline — when an agent should recall before acting and save afterward. CC0, backend-neutral, works against any memory store rather than this one. It carries its own marketplace manifest under
.claude-plugin/. - awesome-agent-memory — a curated index of the category, CC0, including the servers this one competes with
Project
This server sends to the Mnemoverse API (core.mnemoverse.com), authenticated with your API key, what a tool call carries — and nothing else it can see. It does not read your AI client's conversation history, your local files, or anything you don't pass to a memory_* / vault_* tool. Stored memories live under your account; Mnemoverse never sells them and never shares them on its own. The one sharing path is the one you create yourself: inviting someone to a shared room grants their assistant access to that room's memories, bounded by the invite's scope.
What each tool sends:
| Tool | Data sent |
|---|---|
memory_write |
the content, concepts, and domain you pass |
memory_read |
the query, plus any filters: domain, since/until, exclude_author, top_k, order_by |
memory_list_recent |
the feed filters: domain, since/until, exclude_author, limit, cursor |
memory_feedback |
the memory_ids being rated (sent to the API as atom_ids), the outcome score, and the domain when you pass one (a shared room's address) |
memory_create_room |
the room name and description |
memory_invite_to_room |
the room_id, invite scope, and expiry |
memory_join_room |
the invite code |
memory_stats / memory_list_rooms / vault_list |
no request body — authenticated GETs |
One thing goes out that you did not explicitly request: since 0.8.1, when a search or feed comes back empty, the server sends one or two authenticated read-only GET probes (/memory/rooms and/or /memory/stats) so the empty answer can say what it did not cover. The probes carry your API key and nothing else, change no stored state, and are disclosed in the CHANGELOG.
| Privacy Policy | https://mnemoverse.com/privacy |
| Retention & deletion | correct a wrong or stale memory by writing a fresh one; deletion is an administrative operation on the REST API, not exposed through this MCP server |
| Contact | hello@mnemoverse.com |
MIT © Mnemoverse