Aegis

com.undercurrentholdingsPublished by undercurrentholdings.comv1.4.2Updated Oct 24, 2026

Local stdio MCP server for the AEGIS governance client. The hosted evaluation service is offline.

VerifiedSTDIODesktop onlyDeveloper ToolsSecurity & Monitoring

Overview

AI-generated overview

Local stdio MCP server from the AEGIS governance client that would let an assistant submit engineering proposals for gate-based risk evaluation, but its…

What you can do
  • Evaluate engineering proposals through AEGIS gate checks and run quick risk threshold checks
  • Check AEGIS API health, including service status, version and components
  • List recent governance decisions and fetch a specific decision by ID with full gate detail
  • Retrieve the authenticated customer's evaluation usage report
  • All tools forward requests to the hosted AEGIS API; the local server has no evaluation engine of its own
When to use it
Only relevant if you already use AEGIS governance and want its proposal evaluation and decision history reachable from an MCP client. As documented, the hosted service has been offline since September 2026, so tool calls return no evaluations and installing it now gains little.
Requirements
Python package aegis-governance installed with the mcp extra, which provides the aegis-mcp-server command; Python 3.10 or newer, since on older versions the extra installs nothing and the command exits with a hint. An AEGIS_API_KEY environment variable is needed for all six tools; without it, four tools return an authentication error. Network access to the hosted AEGIS API is required.
Before you install
The AEGIS_API_KEY secret is sent to the hosted AEGIS API, and every tool call goes to that remote service, including sandbox mode without a key. The hosted API and hosted MCP endpoint are reported offline, so results may be missing or fail. The source repository is private; only the PyPI source distribution can be inspected. Tools read customer decision and usage data.

Installation

In SourceWeft

  1. Open Aegis in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Desktop only via STDIO. STDIO servers start a local process, so they need the SourceWeft desktop host.

Other MCP clients

Follow the launch instructions in the repository.

README

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

bash
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

bash
claude mcp add aegis -- aegis-mcp-server

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

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

VS Code (.vscode/mcp.json):

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.

ToolDescription (quoted from the server)
aegis_evaluate_proposalEvaluate an engineering proposal through the AEGIS gate checks.
aegis_quick_risk_checkQuick risk threshold check without a full Bayesian evaluation.
aegis_healthCheck AEGIS API health (service status, version, components).
aegis_list_decisionsList recent governance decisions for the authenticated customer.
aegis_get_decisionFetch a specific governance decision by ID, with full gate detail.
aegis_get_usageGet 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:

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

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

Source: README.md at commit 38e8228

Tools

0
SourceWeft has not started this package in its sandbox yet, so its tools are not known.

Version history

2
  1. v1.4.2LatestSep 18, 2026
  2. v1.3.1Sep 16, 2026

Score

50% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 days25 pts

    Keep the endpoint answering the MCP handshake; SourceWeft probes it every 30 days.

  • Auth declared10 pts

    Declare the credential headers in the registry entry, or keep the endpoint answering the probe so its auth can be classified.

  • Tools listed15 pts

    Answer tools/list without a credential, or ship a package that starts in a sandbox without one.

  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts