Polar Signals vs io.github.rhel-lightspeed/linux-mcp-server
Polar Signals is an MCP server published by docker. Marketplaces we read that list it: 1 (Docker MCP Catalog). io.github.rhel-lightspeed/linux-mcp-server is an MCP server published by rhel-lightspeed. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-23. This pair was picked by a reader, not by our comparison rule, so search engines are asked not to index the page.
Where each is published
| Marketplace |  Polar Signals |  io.github.rhel-lightspeed/linux-mcp-server |
|---|---|---|
| Docker MCP Catalog | Listed Version: not stated No figure published Not marked · First seen |
Not listed |
| Official MCP Registry | Not listed | Listed Version: 1.4.0 Downloads/month (PyPI): 2 837 Downloads/week (PyPI): 663 Forks (GitHub): 66 Stars (GitHub): 315 Not marked · First seen |
Each figure is the marketplace's own and is never added up across marketplaces. A marketplace that publishes no figure shows none: no number is not zero.
The facts side by side
| Fact | Polar Signals | io.github.rhel-lightspeed/linux-mcp-server |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | No figure on GitHub | 315 |
| Forks (GitHub) (differs) | No figure on GitHub | 66 |
| Last release | Not published | Not published |
| Where it runs (differs) | Remote server (api.polarsignals.com/api/mcp) | On your machine (linux-mcp-server) |
| Transport (differs) | Streamable HTTP | stdio |
| Tools it declares | Not published | Not published |
| Environment variables it asks for (differs) | 1, secrets among them: 1 | 11, secrets among them: 1 |
| Licence (differs) | Apache-2.0 | Not stated |
| Repository (differs) | Not stated | github.com/rhel-lightspeed/linux-mcp-server |
| Changes in the last 7 days | 0 | 0 |
| First seen | 2026-10-11 | 2026-10-11 |
| Endpoint at the last check (differs) | Responded 32 h ago | no remote endpoint we check |
Lines where the two differ have a tinted background and bold values. Where the data itself says which value is better (more marketplaces, a larger figure of the same marketplace, a fresher release, a verified mark on a marketplace that lists both), the better one is also marked green with ▲ and the worse one red with ▼. Where it runs, the transport, the tools, the settings, hooks, the bundle's parts, the licence and the week's changes are marked only as different: more or fewer is not better in itself.
What each says it does
Polar Signals
MCP server for Polar Signals Cloud continuous profiling platform, enabling AI assistants to analyze CPU performance, memory usage, and identify optimization opportunities in production systems.
io.github.rhel-lightspeed/linux-mcp-server
MCP server for read-only Linux system administration, diagnostics, and troubleshooting
How to run each
Polar Signals As a remote MCP server
claude mcp add --transport http polar-signals https://api.polarsignals.com/api/mcp/Requires: POLAR_SIGNALS_API_KEY (secret)
io.github.rhel-lightspeed/linux-mcp-server As a local MCP server: PyPI package
claude mcp add --env "LINUX_MCP_KEY_PASSPHRASE=<YOUR_LINUX_MCP_KEY_PASSPHRASE>" --transport stdio linux-mcp-server -- uvx linux-mcp-serverRequires: LINUX_MCP_KEY_PASSPHRASE (secret)
Commands built only from what the marketplaces declare; the full set for every client is on each card.
Only Polar Signals has a remote endpoint we check. How we check endpoints
Tools each declares
Neither one's marketplaces publish a list of tools, so there is nothing to compare.
Settings each asks for
Only Polar Signals asks for
POLAR_SIGNALS_API_KEY (secret)
Only io.github.rhel-lightspeed/linux-mcp-server asks for
LINUX_MCP_ALLOWED_LOG_PATHSLINUX_MCP_COMMAND_TIMEOUTLINUX_MCP_KEY_PASSPHRASE (secret)LINUX_MCP_KNOWN_HOSTS_PATHLINUX_MCP_LOG_DIRLINUX_MCP_LOG_LEVELLINUX_MCP_LOG_RETENTION_DAYSLINUX_MCP_SEARCH_FOR_SSH_KEYLINUX_MCP_SSH_KEY_PATHLINUX_MCP_USERLINUX_MCP_VERIFY_HOST_KEYS
Settings as each marketplace publishes them. Asking for fewer is not better in itself.
What it can do: Polar Signals · What it can do: io.github.rhel-lightspeed/linux-mcp-server · Compare two other plugins
Data comes from the Docker MCP Catalog (desktop.docker.com/mcp/catalog) and Docker Hub. Data comes from the Official MCP Registry (registry.modelcontextprotocol.io), CC0 1.0. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.