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HippoDid MCP Server

Official registry AI and agents

Persistent, structured cloud memory for AI agents. BYOK — bring your own AI key.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

MCPB package https://github.com/SameThoughts/hippodid-mcp-server/releases/download/v1.1.0/hippodid-mcp-server-1.1.0.jar

Environment variables

  • HIPPODID_API_KEY Your HippoDid API key. Get one at https://app.hippodid.com/settings/api-keys
  • HIPPODID_CHARACTER_ID Default character UUID for background sync
  • HIPPODID_BASE_URL API base URL (default: https://api.hippodid.com)

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. HippoDid MCP Server
  2. What is HippoDid?
  3. Quick Start
  4. MCP Tools
  5. Environment Variables
  6. Architecture
  7. Building from Source
  8. Versioning
  9. License

HippoDid MCP Server

Persistent, portable memory for AI agents. Your AI forgets everything between sessions. HippoDid remembers.

HippoDid MCP Server

MCP (Model Context Protocol) server for HippoDid — connects Claude Code, Claude Desktop, ChatGPT, Gemini CLI, Codex CLI, Cursor, and any MCP-compatible client to persistent AI character memory.

What is HippoDid?

HippoDid is a cloud memory infrastructure for AI agents. It stores structured memories (preferences, decisions, skills, relationships) in a searchable database and retrieves them across sessions, tools, and AI providers. Write a memory in Claude Code, recall it in ChatGPT. Switch from Cursor to Gemini — your agent's memory travels with it.

Key features:

  • Cross-platform memory — same memories accessible from any MCP client or ChatGPT via OAuth
  • Structured extraction — raw text is automatically parsed into categorized facts with salience scores
  • Temporal decay — memories fade naturally by category (skills are evergreen, events fade in 14 days)
  • Character scoping — each agent/project gets its own memory namespace
  • BYOK AI — bring your own OpenAI, Anthropic, or Gemini key for extraction

Quick Start

1. Get an API Key

Sign up at hippodid.com and create an API key from your dashboard.

2. Download the JAR

Download the latest release from GitHub Releases.

3. Configure Claude Desktop

Add to your Claude Desktop config (~/Library/Application Support/Claude/claude_desktop_config.json on macOS):

{
  "mcpServers": {
    "hippodid": {
      "command": "java",
      "args": ["-jar", "/path/to/hippodid-mcp-server-1.1.0.jar"],
      "env": {
        "HIPPODID_API_KEY": "hd_key_your_key_here",
        "HIPPODID_CHARACTER_ID": "your-character-uuid"
      }
    }
  }
}
4. Start Using

Ask Claude to remember things, search memories, sync files, and more.

MCP Tools

ToolDescription
create_characterCreate a new character to store memories for
list_charactersList all characters accessible to you
add_memoryAdd a memory via the AUDN pipeline (rule-based salience + dedup)
add_memory_directWrite a memory directly, bypassing AUDN pipeline (Starter+ tier)
search_memoriesHybrid semantic + keyword search across memories
sync_fileSync a local file to the HippoDid cloud
import_documentImport a document and extract memories (Starter+ tier)
list_synced_filesList files synced to the cloud for a character
get_sync_statusGet sync status summary for a character
export_characterExport all memories for a character as Markdown
add_watch_pathSync a file and register the path for background tracking
list_watch_pathsList all watched file paths in this session
force_syncForce an immediate sync of all watched paths
configure_aiConfigure tenant BYOK AI providers
test_ai_configTest connectivity of saved AI provider configuration

Environment Variables

VariableRequiredDefaultDescription
HIPPODID_API_KEYYes—Your HippoDid API key
HIPPODID_CHARACTER_IDNo—Default character UUID for background sync
HIPPODID_BASE_URLNohttps://api.hippodid.comAPI base URL
MCP_SYNC_INTERVALNo300Background sync interval in seconds
MCP_AUTO_CAPTURENofalseDisable background watcher (AI handles sync)
MCP_AUTO_RECALLNofalseDisable background hydration (AI handles download)
MCP_RECALL_CACHE_TTLNo120Search result cache TTL in seconds

Architecture

Claude Desktop → stdio (JSON-RPC) → McpServerRunner → HippoDidClient → HTTP → HippoDid REST API

The MCP server uses the hippodid-spring-boot-starter to communicate with the HippoDid REST API over HTTP. All authentication and tenant isolation is handled server-side via Bearer tokens.

Building from Source

Requires Java 21+ and Maven 3.8+.

mvn clean package -DskipTests
java -jar target/hippodid-mcp-server-1.1.0.jar

Versioning

The MCP server version matches the hippodid-spring-boot-starter version. Both must be at the same version for compatibility.

License

Apache License 2.0 — see LICENSE.

Frequently asked questions

What is HippoDid MCP Server?

Persistent, structured cloud memory for AI agents. BYOK — bring your own AI key.

How do I install HippoDid MCP Server?

Follow the installation steps in its documentation, shown on this page and in its repository.

Does HippoDid MCP Server need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is HippoDid MCP Server open source?

Yes. Its code is on GitHub under the Apache-2.0 license.

Who maintains HippoDid MCP Server?

It is published by SameThoughts. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.