# ContextStream (MCP server)

> ContextStream is an MCP server that adds developer tools to AI assistants such as Claude Desktop, Claude Code and Cursor. Persistent memory and cross-session learning for AI coding assistants (hosted remote MCP). It has 44 GitHub stars, is released under the MIT license and runs locally with npx -y @contextstream/mcp-server.

Persistent memory. Millisecond code search. Connect your code, docs, and conversations so your agents can find the right files, recall saved decisions, and build on past work across sessions and tools.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/contextstream/mcp-server |
| GitHub stars | 44 |
| License | MIT |
| Language | Rust |
| Transport | stdio, streamable-http |
| Packages | npm: @contextstream/mcp-server |
| Remote URL | https://mcp.contextstream.io/mcp?default_context_mode=fast&src=registry, https://mcp.contextstream.io/mcp |
| Needs API key | yes |
| Official | yes |
| Works with | Claude Desktop, Claude Code, Cursor, VS Code, Claude.ai, ChatGPT |
| Category | Developer tools |
| Latest release | v1.0.17 (Oct 6, 2026) |
| Last commit | Oct 6, 2026 |
| MCP registry name | io.contextstream/mcp |

## Install

### Claude Desktop (claude_desktop_config.json)

```json
{
  "mcpServers": {
    "contextstream": {
      "command": "npx",
      "args": [
        "-y",
        "@contextstream/mcp-server"
      ],
      "env": {
        "CONTEXTSTREAM_API_KEY": "your-value"
      }
    }
  }
}
```

Settings > Developer > Edit Config. macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\. Restart Claude Desktop afterwards.

### Claude Code

```sh
claude mcp add --env CONTEXTSTREAM_API_KEY=your-value --transport stdio contextstream -- npx -y @contextstream/mcp-server
```

### Cursor (.cursor/mcp.json)

```json
{
  "mcpServers": {
    "contextstream": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@contextstream/mcp-server"
      ],
      "env": {
        "CONTEXTSTREAM_API_KEY": "your-value"
      }
    }
  }
}
```

Project file; use ~/.cursor/mcp.json to enable it in every project.

### VS Code (.vscode/mcp.json)

```json
{
  "inputs": [
    {
      "type": "promptString",
      "id": "contextstream_api_key",
      "description": "CONTEXTSTREAM_API_KEY",
      "password": true
    }
  ],
  "servers": {
    "contextstream": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@contextstream/mcp-server"
      ],
      "env": {
        "CONTEXTSTREAM_API_KEY": "${input:contextstream_api_key}"
      }
    }
  }
}
```

### Claude Code (remote)

```sh
claude mcp add --transport http contextstream "https://mcp.contextstream.io/mcp?default_context_mode=fast&src=registry"
```

The same server is also hosted as a remote MCP endpoint, so nothing runs on your machine.

Config formats checked against the official docs on 2026-10-07.

## Environment variables

- `CONTEXTSTREAM_API_KEY` (secret) (required): ContextStream API key
- `CONTEXTSTREAM_API_URL`: ContextStream API base URL

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---

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