Althea MCP

A direct line from your coding agent to your Althea.
Shared research memory and a consent-first network of verified ML researchers.

Give Codex, Claude Code, and other coding agents a direct line to your personal Althea. They can hand her questions, code, and context from the repository in front of them. Althea brings your shared research memory and, when useful, can ask a consent-first network of verified ML researchers for help.

• Agents that can talk to each other. Pass questions, code, experiment results, and repository context between your coding agent and Althea.
• Your Althea, with your context. MCP uses your existing account, profile, and long-term research memory.
• A route into the researcher network. Althea can ask verified ML researchers for help, with consent before private context is shared.
• Client-specific conversations. Codex and Claude stay separate when you give them distinct thread keys, while Althea keeps your shared context.
• Work asynchronously. Wait for a reply, leave a message for longer work, or read the thread later.

Setup · Connect a client · First conversation · Tools · Security and privacy · Development

Setup

You need access to Althea and uv. Install Althea MCP from PyPI, then sign in with an emailed verification code:

uv tool install althea-mcp
althea-mcp setup

If the install succeeds but the command is not found, run uv tool update-shell and open a new terminal.

Run setup yourself in an interactive terminal. Enter your email and verification code there, not in an AI chat.

Connect your personal Althea
-----------------------------
Email: you@example.com
A verification code was sent to you@example.com.
Verification code:

Althea MCP is ready.
Credentials saved to ~/.config/althea-mcp/credentials.json

Setup follows the same account journey as the Althea web app:

• Existing accounts receive a verification code by email.
• Eligible new accounts are asked for a name, then receive a verification code.
• Accounts that still need access are sent to the Althea application. Complete it, then run setup again.

The installed server starts without fetching code on every launch. Its tools still need a network connection to Althea. Upgrade the package later with:

uv tool upgrade althea-mcp

Connect an MCP client

Complete setup once, then add the local stdio server. Give each client a different thread key.

[!CAUTION] This server can read private Althea history and send real messages. Register it only in clients and projects you trust.

Codex

codex mcp add althea \
  --env ALTHEA_THREAD_KEY=codex \
  -- althea-mcp
codex mcp list

codex mcp add writes to your user configuration. Equivalent ~/.codex/config.toml:

[mcp_servers.althea]
command = "althea-mcp"

[mcp_servers.althea.env]
ALTHEA_THREAD_KEY = "codex"

Claude Code

claude mcp add althea \
  -e ALTHEA_THREAD_KEY=claude-code \
  -- althea-mcp
claude mcp list

That command uses Claude Code's project-local scope. Add --scope user immediately before althea only if you want the server available in every project you open.

A user-wide manual entry under the top-level mcpServers object in ~/.claude.json looks like this:

{
  "mcpServers": {
    "althea": {
      "type": "stdio",
      "command": "althea-mcp",
      "env": {
        "ALTHEA_THREAD_KEY": "claude-code"
      }
    }
  }
}

Claude Desktop and other local clients

Find the installed command:

command -v althea-mcp

On Windows PowerShell:

(Get-Command althea-mcp).Source

GUI applications sometimes receive a smaller PATH than your terminal. If althea-mcp is not found, use the absolute path returned above:

{
  "mcpServers": {
    "althea": {
      "command": "/absolute/path/to/althea-mcp",
      "env": {
        "ALTHEA_THREAD_KEY": "claude-desktop"
      }
    }
  }
}

Restart the client after changing its MCP configuration.

Start a conversation

Try one of these prompts in your MCP client:

Ask my Althea whether anyone in the researcher network has worked on this
failure mode. Share only the sanitized summary below:
[summary]

Send this context to my Althea without waiting for a reply:
The latest experiment rules out the data-loader hypothesis. The remaining
failure starts after gradient accumulation.

Check whether my Althea has replied in the MCP thread.

Messages continue the configured thread. They are real messages to your personal Althea and may cause her to begin work.

Tools

The two send tools are marked as state-changing. Conversation search and message retrieval are read-only. The current tool surface is text-only. It does not expose attachments or other Althea artifacts.

How it works

Codex / Claude Code / another coding agent
                    │ local stdio
                    ▼
               Althea MCP
                    │ HTTPS
                    ▼
              your Althea
                    │
                    ├── your profile and long-term research memory
                    ├── a persisted conversation for this thread key
                    └── a consent-first network of verified ML researchers

Althea MCP is a small public adapter. The frontend authenticates the user, resolves their canonical Althea, sends messages, and stores the resulting conversation. The package polls those persisted messages when a caller waits for a reply. The coding agent talks to Althea, and Althea coordinates with the researcher network when a request would benefit from outside expertise.

Sign-in and sessions

Setup creates a normal Althea usage session:

• The access session lasts 7 days.
• Its rotating refresh-token family lasts 14 days from sign-in.
• Access tokens refresh automatically before expiry.
• A cross-process lock lets several local MCP clients share the credential file without racing refresh-token rotation.
• When the session expires or is revoked, run althea-mcp setup again in a separate terminal. Running MCP processes reload the replacement credentials.
• Signing in again rotates credentials only. It does not replace conversation history when the Althea account and ALTHEA_THREAD_KEY stay the same.

Credentials are stored as plaintext JSON at ~/.config/althea-mcp/credentials.json. On operating systems that support Unix file modes, the credential file is set to 0600. A parent directory created by Althea MCP is requested as 0700; check the permissions yourself when using a pre-existing custom directory.

Security and privacy