Context7
Feeds AI the latest docs for libraries and frameworks before it answers, so code it writes does not use outdated, removed functions.
Computer or cloud
Cairn.ink Memory
What it does
Cross-session memory for AI agents with a Source Receipt for every memory, over MCP.
- Connects Runs in the cloud
- Account or key Needs Authorization
- Category Search & AI memory
Install
Pick the AI app you use, then copy the settings.
Passed 4/4 checks · What you ask goes through the maker’s server (cairn.ink) · ✓ Commands checked Nov 13, 2026
First: which AI do you use?
Pick your app and the steps appear below.
Works with Claude · about 5 min
You need a Cairn.ink Memory key (create it on the maker’s site) · Set it up once on claude.ai or the desktop app, then use it in chat · free accounts can add 1 · on Team/Enterprise an Owner adds it
Sign up and create a Cairn.ink Memory key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
Open Claude’s Connectors page
CustomizeConnectors
Click “Add” → “Custom” → “Web” and fill in these 2 fields
Copy each value into the field with the same name in Claude, then click Continue
Name · NameCairn.ink MemoryRemote MCP server URL · Addresshttps://cairn.ink/api/mcpUnder Request headers, add this name and value
Header nameAuthorizationValueBearer <paste your key here>Paste the key only into the app’s field, never into a chat or to anyone
Click Continue past the sign-in settings Claude detected · under Authentication choose what the maker says (Sign in now, Sign in when needed or No sign in), then click Add
Turn it on in a chat
+ConnectorsCairn.ink Memory
Try it
Use Cairn.ink Memory and tell me what you can do for me, then show me one thing✓ If Claude says it is using Cairn.ink Memory or shows a Cairn.ink Memory tool in the answer, you are connected
Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version
ChatGPT cannot connect Cairn.ink Memory yet
Cairn.ink Memory needs your own key to connect, but OpenAI’s help page only describes OAuth sign-in; there is no key option we could verify
What you can do instead
A · Use an app that can connect Cairn.ink Memory
- You need a Cairn.ink Memory key (create it on the maker’s site) · Set it up once on claude.ai or the desktop app, then use it in chat · free accounts can add 1 · on Team/Enterprise an Owner adds it
- You need a Cairn.ink Memory key (create it on the maker’s site)
- You need a Cairn.ink Memory key (create it on the maker’s site)
- You need a Cairn.ink Memory key (create it on the maker’s site)
Works with Claude Code · about 5 min
You need a Cairn.ink Memory key (create it on the maker’s site)
Sign up and create a Cairn.ink Memory key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
Open Terminal
Mac: press Command+Space and type Terminal · Windows: open PowerShell
Paste this command and press Enter
claude mcp add --transport http --scope user memory https://cairn.ink/api/mcp --header 'Authorization: Bearer your-value'Replace “your-value” with your key before pressing Enter
Paste the key only into the app’s field, never into a chat or to anyone
Type /mcp in Claude Code
You should see Cairn.ink Memory listed as connected
Try it
Use Cairn.ink Memory and tell me what you can do for me, then show me one thing✓ If Claude Code says it is using Cairn.ink Memory or shows a Cairn.ink Memory tool in the answer, you are connected
Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version
Works with Cursor · about 5 min
You need a Cairn.ink Memory key (create it on the maker’s site)
Sign up and create a Cairn.ink Memory key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
Fill in your key
In the Cairn.ink Memory settings, Authorization is empty; add your key and save
Paste the key only into the app’s field, never into a chat or to anyone
Open the AI chat in Cursor in Agent mode
Try it
Use Cairn.ink Memory and tell me what you can do for me, then show me one thing✓ If Cursor says it is using Cairn.ink Memory or shows a Cairn.ink Memory tool in the answer, you are connected
Menu names checked against Cursor’s help page on Nov 11, 2026 · your screen may differ slightly by app version
Works with VS Code · about 5 min
You need a Cairn.ink Memory key (create it on the maker’s site)
Sign up and create a Cairn.ink Memory key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
Fill in your key
In the Cairn.ink Memory settings, Authorization is empty; add your key and save
Paste the key only into the app’s field, never into a chat or to anyone
Open the AI chat in VS Code in Agent mode
Try it
Use Cairn.ink Memory and tell me what you can do for me, then show me one thing✓ If VS Code says it is using Cairn.ink Memory or shows a Cairn.ink Memory tool in the answer, you are connected
Menu names checked against VS Code’s help page on Nov 11, 2026 · your screen may differ slightly by app version
Other apps that use MCP, such as Windsurf, Zed or Gemini CLI, each add servers differently. See how in the app list.
Address for apps that connect over the web
Address
https://cairn.ink/api/mcpJSON settings are under “For developers” below
For developers: Terminal commands and JSON settings
Over the web
Claude Code
claude mcp add --transport http --scope user memory https://cairn.ink/api/mcp --header 'Authorization: Bearer your-value'Cursor (~/.cursor/mcp.json)
{
"mcpServers": {
"memory": {
"url": "https://cairn.ink/api/mcp",
"headers": {
"Authorization": "Bearer your-value"
}
}
}
}VS Code (mcp.json)
{
"servers": {
"memory": {
"type": "http",
"url": "https://cairn.ink/api/mcp",
"headers": {
"Authorization": "Bearer your-value"
}
}
}
}Values you fill in
- Optional. Bearer from https://cairn.ink/settings/tokens. Clients that support OAuth discover authentication automatically and can omit this header.
Descriptions are as written by the maker.
These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.
At a glance
Which apps can use it
Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.
Connect over the internet in
ClaudeGooseLM StudioMsty StudioCherry StudioCursorVS Code + GitHub CopilotVisual StudioWindsurf (Devin Desktop)ZedKiroClineContinueJetBrains AI AssistantClaude CodeCodex CLIGemini CLIOpenCodenodecodeWarpLibreChatOpen WebUIRaycast
Related guides
What it can do
The server asks you to sign in before it lists its tools.
Basic checksi
We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 14, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified against the domain cairn.ink (the registry checks domain ownership)
- ✓ Pass
Still maintained
Code last changed today
- – Not applicable
Has a licence
Not applicable: a cloud server run by the owner of cairn.ink; you don't run code from the repo
- ✓ Pass
Endpoint responds
Responded in 153 ms (HTTP 401)
- ✓ Pass
Sign-in with OAuth
Declares OAuth sign-in, so your AI app can take you to log in
- … Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint
Discussion
Ask, share a tip or report that it does not work. Sorted by what people marked helpful.
No posts yet. Be the first to ask or share.
Posts here are written by users, not the PopNx team.
User reviews
No reviews yet
Compared with others in Search & AI memoryi
- More stars than 96% of the other 6099 servers in this category
- Published to the registry more recently than 44% of the other 6099 servers in this category
- Basic checks equal to or better than 100% of the other 6099 servers in this category
Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.
Common questions
Is Cairn.ink Memory safe?
It passed 4 of 4 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.
What keys or codes does it need?
You need to fill in: Authorization
Does it run on my computer or in the cloud?
It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.
Is it still maintained?
The GitHub repo last changed today, and the latest version (0.1.0) reached the registry 2 months ago.
Which apps can use it?
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT on the web (full MCP on Business and above; Pro read-only).
What can I use instead?
In the same category: Context7, Codebase Memory, OpenSEO
Others in the same category
Servers in the same category from other makers, sorted by stars.
Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
Codebase Memory
Codebase knowledge graph for AI agents — 162 languages, sub-ms queries, 99% fewer tokens.
Runs on your computer
OpenSEO
Keyword research, site audits, rank tracking and AI visibility for your AI agent.
Runs in the cloud✓ everyapp.com
README from the maker
Open the README
Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.
Cairn Memory
Keep important context between AI sessions. Change it when things change.
English · 繁體中文
See an example · Where to start · Local setup · Hosted setup · Limitations · Privacy
Cairn Memory is Cairn.ink's open-source AI memory toolkit for Claude Code and Codex, with local MCP tools or cloud automatic memory. Visit Cairn.ink, install @cairn-ink/memory on npm, or view the Cairn Memory GitHub repository.
Starting a new AI session often means repeating your preferences and project decisions. Cairn provides memory tools to save that context between sessions, inspect the submitted text behind each memory, and update it when things change.
A preference changes
Suppose you save “Keep my reports short.” Later, you decide you need detailed reports. You can inspect the old memory and its source text, correct the saved preference, or forget it so it is no longer available for active recall.
This is an illustrated explicit-tool example, not a chat-client screenshot. The local preview uses tools to save, inspect, correct and forget; it does not automatically read your conversations.
- Inspect the source. Read the source text stored with a memory. A receipt does not prove that the memory is true or correctly interpreted.
- Correct what changed. Update the memory at the revision you inspected.
- Forget what should go. Remove a memory from active recall. Deletion and backup boundaries apply.
A Source Receipt is the submitted text attached to a memory. It helps you check what was supplied when the memory was saved or corrected. It is not a verified transcript of the whole conversation or proof of human intent.
Cairn Memory and Cairn
Cairn Memory is the open-source toolkit in this repository for saving, inspecting and changing AI memory. [Cairn](https://cairn.ink) is the hosted shared memory map for people and AI, where people organize, review and share knowledge.
This repository includes local memory tools and connectors to the hosted Cairn service. Each path has its own setup and feature boundaries. Local use does not require a Cairn account; hosted connections require a compatible service and authentication.
Choose your starting point
| You want to… | Start here | What you need |
|---|---|---|
| Understand the idea before installing | 繁體中文 or the recorded walkthrough | No installation or account |
| Try the open-source tools on your computer | Local preview setup or Windows guide | Terminal setup; Linux x64 and a bounded native Windows x64 check; no Cairn account |
| Use the documented hosted Claude Code or Codex connection | Hosted setup | A compatible hosted service and authentication; separate from local-preview client support |
| Build on the memory layer | Architecture and MCP tools | JavaScript or MCP integration work |
If you use Claude or Codex but do not usually install tools from a terminal, start with the example and recorded walkthrough. This preview requires setup; check the tested client paths before connecting your AI tool.
Current preview
Cairn's open-source memory layer stores memories in your own SQLite file and exposes them through MCP or JavaScript. No Cairn account is needed for local use.
Developer preview. Installed persistence and a narrow real-model memory loop have retained evidence. Default extraction still fails our source-support bar; see known limitations. Save, inspect, correct and forget work without a model key. Semantic recall requires your OpenAI key and sends selected context to that provider.
Watch the recorded walkthrough
Watch the 36-second model-free demo (MP4). This records the memory tools running, rather than a conversation in Claude or Codex. “Model-free” means no AI model is called during the walkthrough.
For long-conversation results, see the four-case real-model pilot. It is an opt-in diagnostic with one failed Cairn answer, not a measurement of long-term default-client recall reliability. Known limitations
Open the recorded tool walkthrough (GIF)
The demo below records the model-free loop: save, restart, inspect, correct and forget. Its recall step reports model_not_configured.
Recorded responses and regeneration instructions · Verified capabilities and client support
Install
For Claude Code and Codex, run the one-command installer:
npx @cairn-ink/memory setupA fresh interactive install asks once: local MCP memory tools on this computer, or cloud automatic memory with cairn.ink sign-in; choose directly with setup --local or setup --cloud. Fresh non-interactive runs need --local or --cloud; local mode has no automatic capture or recall in 0.6.3.
Installer 0.6.3, with Codex 0.164.0–0.166.0 format requalification, was published on 2026-11-03, so npx @cairn-ink/memory setup uses it; a checkout can also run node packages/setup/bin/memory.mjs setup. The plugin is 0.3.3. Requires Node ≥22.16 and at least one CLI on PATH. Cloud setup asks about new tools, updates connected tools, and uses one browser sign-in when connecting both. The default server is cairn.ink. Conflicting servers or memory IDs present a choice; non-interactive conflicts change nothing. Codex must pass format qualification before automatic memory is enabled. Automated codex exec runs skip capture and prompt recall by default; opt in with npx @cairn-ink/memory config --codex-capture-exec on.
Choose the mode that fits your workflow:
- [Local preview](#try-the-local-memory-layer): your SQLite database, explicit MCP memory tools, no Cairn account. Start here to try the open-source memory layer. Semantic recall uses your OpenAI key.
- [Hosted integration](#existing-hosted-integration): memory on cairn.ink, with automatic capture and recall through the Claude Code plugin. Requires a Cairn account, token and compatible service. Explicit hosted MCP is also available.
Try the local memory layer
Prerequisites: Git, Node >=22.16, npm and `tar`. Recorded checks cover Linux x64 and a bounded native Windows x64 installation. On Windows, use the [PowerShell setup and walkthrough](docs/windows-install.md); the commands below use Linux/WSL paths. Other platforms are unverified. Install from this repository: the unscoped npm and PyPI packages named cairn-memory are unrelated projects. The local archive is not published to npm yet.
1. Install into a new directory. Replace the path below with a new absolute directory beneath an existing parent you control.
git clone https://github.com/Cairn-ink/cairn-memory.gitcd cairn-memory npm run install:preview -- --directory /absolute/new/cairn-local --owner local-user
The installer builds this checkout and downloads pinned public npm dependencies without install scripts. It creates app/, data/ and a private installation-receipt.json containing the executable path and MCP settings. It makes no model calls. Keep the receipt private: it contains local paths and identity. Installation details, recovery and backup
2. Run the model-free check. From the source checkout, use the same installation path. No chat-client setup or model key is needed.
npm ci --prefix adapters/mcpnode adapters/mcp/walkthrough.mjs --executable /absolute/new/cairn-local/app/node_modules/.bin/cairn-memory
Expect status: "passed". The check uses a fresh synthetic database and verifies the five tools, receipts, process-restart persistence, correction and forgetting. It strips the model key from the child process; model_not_configured is the expected recall result. Steps and expected results
3. Connect a client. Copy stdio.command and stdio.args from your private installation receipt into the client's local MCP configuration. Keep the same database, owner and project across sessions. See the tested client matrix.
For semantic recall, explicitly supply OPENAI_API_KEY through the MCP process's secret environment. The walkthrough's optional --with-recall path sends synthetic context to OpenAI and incurs model charges; it has no built-in dollar cap. A fully local model path is not yet verified.
For the Hermes native provider, follow its separate setup guide. It uses a profile-local database and owner, plus CAIRN_MEMORY_OPENAI_API_KEY, rather than the generic MCP settings above.
| Tool | Purpose |
|---|---|
remember_memory | Explicitly save one memory and its receipt |
recall_memory | Model-guided retrieval of current memories and receipts |
inspect_memory | List memories, or inspect an ID, revision and receipts |
correct_memory | Replace content at the revision you inspected |
forget_memory | Logically delete at the revision you inspected |
The default local server exposes explicit tools. For opt-in submitted-message capture, project scope and configuration checks, see the installed preview guide. The full evidence and limitations cover extraction failures, long-history retrieval and the boundaries of individual client tests.
Local privacy and control
- Memory, receipts and organization persist in your selected SQLite database. No Cairn account, hosted service or hidden core telemetry is required.
- MCP does not read transcripts or save whole conversations automatically. Receipt text records a tool assertion; it is not proof of authenticated human intent.
- Model processing is cloud processing when configured. Redaction is best-effort, not a guarantee that all secrets are removed. Retrieved text is untrusted data, never instructions to follow.
- Forgetting prevents active recall and exact normalized re-admission; paraphrases can still be