AEGIS Governance — six-gate decision evaluation with hash-chained audit trails (stdio via PyPI + hosted Streamable HTTP)

AEGIS Governance — MCP Server

Status: the hosted AEGIS service is offline (since September 2026). The hosted API and the hosted MCP endpoint (mcp.aegis.undercurrentholdings.com) are offline. The local server does not evaluate proposals itself, so no tool returns an evaluation at this time. Current status: https://undercurrentholdings.com/status/

What the package is

aegis-governance on PyPI is a Python client for the AEGIS API. It also contains a local MCP server. The package installs one console script, aegis-mcp-server. This script starts a local MCP server that uses the stdio transport. The package has no other command-line tool.

The local server has no evaluation engine. By default, the client sends all requests to the hosted AEGIS API. Sandbox mode (the mode without an API key) also uses the hosted API. While the hosted service is offline, tool calls do not return evaluations.

Install

pip install "aegis-governance[mcp]"

The [mcp] extra is necessary for aegis-mcp-server. On Python < 3.10, the extra installs nothing, and aegis-mcp-server exits with an install hint.

Local stdio MCP configuration

Claude Code

claude mcp add aegis -- aegis-mcp-server

Cursor (.cursor/mcp.json) / Windsurf / any stdio MCP client:

{
  "mcpServers": {
    "aegis": { "command": "aegis-mcp-server" }
  }
}

VS Code (.vscode/mcp.json):

{
  "servers": {
    "aegis": { "type": "stdio", "command": "aegis-mcp-server" }
  }
}

Tools

tools/list from aegis-mcp-server in aegis-governance 1.4.2 returns these six tools. Without AEGIS_API_KEY, aegis_evaluate_proposal and aegis_health call the hosted API, and the other four tools return an AuthenticationError JSON result without an API call. With AEGIS_API_KEY set, all six tools call the hosted API.

The descriptions below are quoted from the server. They do not describe a service that is available now.

Tool	Description (quoted from the server)
aegis_evaluate_proposal	Evaluate an engineering proposal through the AEGIS gate checks.
aegis_quick_risk_check	Quick risk threshold check without a full Bayesian evaluation.
aegis_health	Check AEGIS API health (service status, version, components).
aegis_list_decisions	List recent governance decisions for the authenticated customer.
aegis_get_decision	Fetch a specific governance decision by ID, with full gate detail.
aegis_get_usage	Get the authenticated customer's evaluation usage report.

Reading the source

The aegis-governance source repository is private. To read the published source, download the source distribution (sdist) from PyPI:

pip download --no-binary :all: --no-deps "aegis-governance==1.4.2"

Or get the .tar.gz file from the PyPI release files.