Effect vs Holiday Calendar
Effect is an MCP server published by tim-smart. Marketplaces we read that list it: 1 (Docker MCP Catalog). Holiday Calendar is an MCP server published by modernmustardseed.com. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-28. 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 |   Effect |   Holiday Calendar |
|---|---|---|
| Docker MCP Catalog | Listed Version: sha256:a0e077abc890 Forks (GitHub): 13 Pulls (Docker Hub): 13 188 Stars (Docker Hub): 0 Stars (GitHub): 239 Not marked · First seen |
Not listed |
| Official MCP Registry | Not listed | Listed Version: 1.0.1 Forks (GitHub): 0 Stars (GitHub): 0 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 | Effect | Holiday Calendar |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 239 (better) | 0 (worse) |
| Pulls (Docker Hub) (differs) | 13 188 | No figure on Docker Hub |
| Forks (GitHub) (differs) | 13 (better) | 0 (worse) |
| Last release (differs) | Not published | 2026-10-12 |
| Where it runs (differs) | On your machine (mcp/effect-mcp) | Remote server (starter.modernmustardseed.com/holidays) |
| Transport (differs) | stdio | Streamable HTTP |
| Tools it declares (differs) | 2 | Not published |
| Environment variables it asks for | Not published | Not published |
| Licence (differs) | MIT | Not stated |
| Repository (differs) | github.com/tim-smart/effect-mcp | github.com/modernmustardseed/small-business-mcp-starter |
| Changes in the last 7 days | 0 | 0 |
| First seen (differs) | 2026-10-11 | 2026-10-12 |
| Endpoint at the last check (differs) | no remote endpoint we check | Responded 10 h ago |
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
Effect
Tools and resources for writing Effect code in Typescript.
Holiday Calendar
U.S. federal holidays with observed dates and business-day math. Example from an open-source kit.
How to run each
Effect As a local MCP server: Docker image
claude mcp add --transport stdio effect-mcp -- docker run -i --rm mcp/effect-mcpHoliday Calendar As a remote MCP server
claude mcp add --transport http holiday-calendar https://starter.modernmustardseed.com/holidaysCommands built only from what the marketplaces declare; the full set for every client is on each card.
Only Holiday Calendar has a remote endpoint we check. How we check endpoints
Tools each declares
Only Effect has
effect_docs_searchget_effect_doc
Only Holiday Calendar has
add_business_dayscheck_business_daycount_business_dayslist_federal_holidaysnext_federal_holidays
Both have
None
Tool names as the marketplaces declare them and as Ext Ops observed them on the endpoints (Holiday Calendar as of 2026-10-15). More tools is not better in itself: compare what each needs for the job.
Settings each asks for
Neither one's marketplaces publish the settings it asks for.
What it can do: Effect · What it can do: Holiday Calendar · 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.