Aegis

Six-gate governance for AI agents: PROCEED/PAUSE/HALT decisions with hash-chained audit trails.

Quick Install

Automated & IDE Setup

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Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

{
  "mcpServers": {
    "aegis": {
      "command": "uvx",
      "args": [
        "aegis-governance"
      ]
    }
  }
}

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Capabilities & Tool Schemas (6)Self-reported

Inspect callable tools, capabilities, and parameters exposed to AI agents by Aegis.

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.

Documentation Overview

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

Terminal

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

Terminal

claude mcp add aegis -- aegis-mcp-server

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

config.json

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

VS Code (.vscode/mcp.json):

config.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:

Terminal

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

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

Read the full README →View source on GitHub →

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Adoption & maintenance

Factual signals from GitHub, npm, and our automated checks — not a rating.

Last commit

6d ago

Most recent push to the default branch.

Tools exposed

Callable tools this server registers over MCP.

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Frequently Asked Questions about Aegis

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "aegis": { "command": "uvx", "args": ["aegis-governance"] } }

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Technical Specs & Signals

CategorySecurity

11/12 checks healthy over the last 46d

52Quality signal: Good · 52/100How this signal is calculated ▾

Server availabilityNot measured

Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership10/20

Documentation & tools25/30

Adoption & activity4/15

Community engagement0/10

A guidance signal from public completeness & health data — not a user rating. New listings start lower and rise as they add docs, get verified, and grow adoption. Signals we can't observe for a listing are skipped, not counted against it.

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Scanned 3d ago via OSV.dev · aegis-governance (PyPI)

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Documentation Overview

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

Install

Terminal

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

Terminal

claude mcp add aegis -- aegis-mcp-server

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

config.json

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

VS Code (.vscode/mcp.json):

config.json

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

Tools

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:

Terminal

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

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