muster

MCP server · GitHub · ★ 40 · graded 2026-10-19Source linked

Aggregating MCP server: one authenticated endpoint for every MCP server a platform runs, with meta-tool discovery, toolsets, OAuth 2.1 and SSO through Dex, and Kubernetes custom resources

No outside reports on file

muster runs shell or system commands and requires API keys or tokens; restrict its folder reach, network access, and credentials before installing.

Based on public adoption and transparency signals as of Oct 19, 2026. Our opinion, not a code audit or security guarantee.

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What it can access

Local filesNo local folder access notedLOW
Command executionRuns shell or system commandsREVIEW
Network reachLocal or standard API callsLOW
CredentialsRequires API key or tokenREVIEW
Package sourceGitHub (giantswarm/muster)PUBLIC

Inferred from this listing’s public package details and description. Check the project’s source before installing.

Install

No npm or PyPI package is listed. Install from source: github.com/giantswarm/muster ↗

All setup options ↓

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About Muster

Muster is an MCP server focused on Developer tools and Cloud & infrastructure: Aggregating MCP server: one authenticated endpoint for every MCP server a platform runs, with meta-tool discovery, toolsets, OAuth 2.1 and SSO through Dex, and Kubernetes custom resources.

It is hosted on GitHub at giantswarm/muster (40 GitHub stars). Based on its public metadata, its operational scope includes: runs shell or system commands, requires api key or token.

Setup

These use the package this listing points to. Check the project’s own instructions before running anything.

No npm or PyPI package is listed for this MCP server. Source code and setup steps: github.com/giantswarm/muster.

Why this grade

DD — High risk signals

Signal-based grade (1/7 points): public source code. This reflects adoption and transparency, not a code review.

Popularity and upkeep

19/100

GitHub stars: 40
Listing last refreshed: 2026-10-29

These are public popularity signals, not a maintenance check. Look at the repository’s commit history and open issues.

Security reports

No reports found for this package in our research (last checked 2026-10-29).

Check a specific version →

Risks to watch for

Command execution reach: Public metadata indicates shell, terminal, or container command execution. Run inside an isolated container or VM and require human approval before executing commands.
Credential & token exposure: Requires API keys or secrets in configuration. Store credentials in environment variables with read-only or minimum required scopes and rotate them regularly.
Dependency & version pinning: Distributed via GitHub (giantswarm/muster). Pin an exact release version or commit SHA rather than floating tags so upstream updates are reviewed first.

How to lower the risk

Least-privilege permissions

Give it access only to the specific folders, accounts or projects it needs, never your whole drive or admin account.
Use a separate, limited API key or login just for this tool so you can switch it off without affecting anything else.

Network isolation

Run it on a work computer or sandbox account, not one holding personal or company-sensitive data.
If your IT team can, limit which websites and services it is allowed to contact.

Monitoring

Check its activity history or logs weekly at first, and look at what it changed or sent.
Turn on alerts for new logins or unusual usage on any account it connects to.

Red flags to watch for

It asks for more access than its job requires, or prompts you to paste passwords.
It suddenly updates with new owners, or starts contacting unfamiliar websites.

Questions

How do I install Muster?

Muster does not publish a standalone npm or PyPI package. Clone or follow the setup instructions in its source repository at github.com/giantswarm/muster.

Are there security reports about Muster?

No reports found for this package in our research (last checked 2026-10-29). Muster currently holds Grade D (High risk signals) based on public adoption and transparency signals. Review the permissions and source repository before granting access to local files, shell commands, or API keys.

Is Muster actively maintained?

Muster has 40 GitHub stars. Our directory data was last refreshed on 2026-10-29. Check recent commit activity, release tags, and open issues at github.com/giantswarm/muster before pinning it in production.

What are alternatives to Muster?

You can compare Muster side by side with other Kubernetes MCP servers in the Related tools section on this page, or use the Compare tool on AgentArmorHQ.

Maintain or use Muster? Show its live grade in your GitHub README, docs site, or run a check from the terminal before you install.

GitHub README Markdown:

markdown

[![AgentArmorHQ Risk Grade for Muster](https://agentarmorhq.com/api/badge/giantswarm-muster)](https://agentarmorhq.com/skills/giantswarm-muster)

HTML embed:

html

<a href="https://agentarmorhq.com/skills/giantswarm-muster"><img src="https://agentarmorhq.com/api/badge/giantswarm-muster" alt="AgentArmorHQ Risk Grade for Muster" height="20" /></a>

Terminal check:

terminal

curl -fsSL https://agentarmorhq.com/api/cli | node --input-type=module - check "giantswarm-muster"

Share with your security lead

Need sign-off to use muster? Copy this note for Slack, a ticket or a pull request.

### AgentArmorHQ Security Review Memo: muster
- **Listing URL:** https://agentarmorhq.com/skills/giantswarm-muster
- **Type:** App connector
- **Risk Grade:** Grade D (High risk signals)
- **Outside Security Advisories on File:** 0
- **Public Adoption:** 40 GitHub stars

#### Permission & Blast-Radius Signals
- **Local files:** No local folder access noted
- **Command execution:** Runs shell or system commands
- **Network reach:** Local or standard API calls
- **Credentials:** Requires API key or token
- **Package source:** GitHub (giantswarm/muster)

#### Recommended Hardened Setup
- **Source Repo:** https://github.com/giantswarm/muster
- **Controls:** Pin an exact version in `.mcp.json`, scope access to a single workspace folder, and use a least-privilege read-only token where supported.

_Based on public adoption and transparency signals as of Oct 19, 2026. Our opinion, not a code audit or security guarantee._

Key facts

Type: App connector
Publisher: giantswarm
Source code: github.com/giantswarm/muster
Est. context load: ~900 tokens / turn (~5 tool schemas, 0.45% of 200k context)
Popularity: 40 GitHub stars
Last updated: 2026-10-29
Last graded: 2026-10-19

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