MCP · Model Context Protocol · AI Memory

MantleDB for AI

Give your AI assistant persistent memory — no accounts, no setup. Connect any MCP-compatible client to MantleDB in one line of config.

SSE (Claude Desktop): https://mcp.mantledb.sh/sse
Streamable HTTP (Claude.ai, newer clients): https://mcp.mantledb.sh/
No auth required to connect.

Setup

Add MantleDB to your MCP client config. No install, no API keys — just the URL.

Claude Desktop

claude_desktop_config.json

Cursor

Settings → MCP

Windsurf

MCP Settings

Any MCP client

SSE or Streamable HTTP

Claude Desktop — claude_desktop_config.json

{
  "mcpServers": {
    "mantledb": {
      "url": "https://mcp.mantledb.sh/sse"
    }
  }
}

Tools

The AI can call these tools directly. All tools take namespace as a required parameter. key is only needed for claimed (write-protected) namespaces.

write Store a JSON object or array at a path

namespace path data ttl? key?

read Retrieve an entry

namespace path key?

patch Merge fields into an existing entry (RFC 7396)

namespace path patch key?

list List all paths in a namespace

namespace key?

delete Remove an entry

namespace path key?

increment Atomically increment a numeric field in an entry

namespace path field by? key?

claim Claim a namespace and get a secret write key

namespace email?

Usage

Each tool call includes the namespace and optional key directly — the MCP server is stateless. Different conversations, projects, or users can all use their own namespaces independently.

Example — write and read back

// AI calls write:
namespace: "alice-project"
path:      "preferences"
data:      { "tone": "concise", "lang": "en" }
key:       "sk_abc123"

// AI calls read:
namespace: "alice-project"
path:      "preferences"
key:       "sk_abc123"
// → { "tone": "concise", "lang": "en" }

Persistent Memory

The most common use case: give your AI assistant memory that persists across conversations. Add this to your system prompt:

System prompt

You have access to MantleDB via MCP tools.
Use namespace "alice" with key "sk_abc123" to persist
information across our conversations.

- Before answering, check if relevant context is stored.
- After learning something useful about me, save it.
- Use clear path names like "preferences", "projects/x", "notes/2024".

The AI will then autonomously decide what to save and when — preferences, project context, facts about you — and recall them in future sessions without being asked.

Namespaces & Keys

Namespaces require no sign-up. Pick any name and start writing immediately.

Unclaimed — anyone with the namespace name can read and write. Good for quick, non-sensitive data.

Claimed — locked with a secret key. Use the claim tool or GET /v2/claim/:namespace via the HTTP API. The key is shown once — save it in your system prompt.

Unclaimed namespaces inactive for 30 days are purged automatically. Claimed namespaces are retained for 90 days of inactivity. See Pro for extended retention.