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MCP servers over stdio only

MCP servers whose manifest declares stdio as its only transport. They run as a local process and communicate over standard input and output.

13,862 servers 32% of 42,727 in the directory

This category in numbers

The most frequent value per property, counted across the entries of this category. The full distribution is further down.

Entries

Filter further

Entries 4,501 to 4,550 of 13,862

Entries
US Macroio.github.hgus107/us-macro-mcp
US Places, Thenio.github.ianderso/us-places-mcp
USASpending.govio.github.1102tools/usaspending-gov-mcp
USASpending.govcom.1102tools/usaspending-gov-mcp
USGS Earthquakes MCP by UnClickio.github.malamutemayhem/usgs
USGS Water Services MCP Serverio.github.mansurjisan/usgs-mcp
USGS Water Services MCP Serverio.github.oceanmodeling/usgs-mcp
USRCP — User Context Protocolio.github.frank-bot07/usrcp
UVC PTZ Cameraio.github.AbhijatSaxena/uvc-ptz-camera-mcp
Ui.Vision MCPio.github.A9T9/uivision-mcp
Uindowio.github.uindow/uindow
Uipathio.github.asklokesh/uipath-mcp-server
Ukrainian Language Reference (vitalinguist)io.github.vitalinguist/ukr-vitalinguist-mcp
Ultimate Gemini MCPio.github.nikships/ultimate-image-gen-mcp
Ultralytics Platform MCPio.github.amanharshx/ultralytics-mcp
Umami Compassio.github.webcredo/umami-compass
Umbraio.github.elberacasa/umbra
Umbra open SAR archiveio.github.reesehammer/umbra-mcp
Un-Defaultio.github.NomadBuilder/un-default
UnClickio.github.malamutemayhem/unclick-mcp-server
UnCorreoTemporalio.github.francofuji/uncorreotemporal-mcp-server
Unchore Defendio.github.smilemino/unchore-defend
Understand Anything - MCPio.github.uamcp/ua-mcp
UniFi Access MCPio.github.sirkirby/unifi-access-mcp
UniFi MCPio.github.Servosity/unifi-network-mcp
UniFi Network MCPio.github.sirkirby/unifi-network-mcp
UniFi Protect MCPio.github.sirkirby/unifi-protect-mcp
UniFi RMCPai.dinglebear/runifi
UniFi RMCPai.dinglebear/unifi-rmcp
UniProt MCPio.github.josefdc/uniprot-mcp
UniProt MCPio.github.smaniches/uniprot-mcp
Unicode Logic Kitio.github.fvossel/unicode-logic-kit
Unicode-LEio.github.nolindnaidoo/unicode-le
Unified AI System MCP Gatewayio.github.happy520ai/unified-ai-system
Unitrends Backupio.github.wyre-technology/unitrends-mcp
Unitrends Backupio.github.WYRE-AI/unitrends-mcp
Units-LEio.github.nolindnaidoo/units-le
Unity API Documentationio.github.Codeturion/unity-api-mcp
Unity MCPdev.shiranui-isuzu/unity-mcp
Unity MCPio.github.isuzu-shiranui/unity-mcp
Unity MCP Serverio.github.rachitkumarrastogi/unity-mcp-server
Universal Brute Workpackio.github.haoyun18881-beep/universal-brute-workpack
Universal DB (read-only)io.github.alghanim/universal-db-mcp
Universal File Opener CLIio.github.krauqllc/ufo-cli
Universal Screenshot MCPio.github.sethbang/screenshot-server
UnlimitedTTScom.unlimitedtts/tts
Unofficial Apple Music for macOSio.github.jaminben/secure-applemusic-mcp-for-osx
Unofficial MCP Server for USWDSio.github.bibekpdl/uswds-mcp
Unraid MCPai.dinglebear/unraid-mcp
Unraid MCPtv.tootie/unraid-mcp

All 13,862 entries in the list, with filters and pagination

What this category selects

What this category selects
Transports (raw)stdio
measured directly

A derived value carries its original data beside it; the derivation rule is published, with a version, on the methodology page.

Caveats, distribution and query

What this category does not say

  • Transports (raw) is the complete, sorted enumeration of what a manifest declares. So "stdio" means exactly that and nothing else: an entry that also declares something different is not in this category.
  • This category shares 13,856 of its 13,862 entries with "MCP servers available as a package only" (14,911). Both are measured from different original data; that they hit almost the same set is a finding, not a rule.

What is measured is what a manifest declares, not what a piece of software does. This registry fetches no repository URL, no endpoint and no package index; nothing here is verified. Which value comes from which source, and by which rule it was formed, is set out in the Methodology.

Every sentence here follows from the condition above, not from an assessment.

How this category is distributed

Required secrets declared

13,862
Required secrets declared
no10,965 79 %
yes2,897 21 %

Schema version of the raw record (raw)

13,856
Schema version of the raw record (raw)
https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json12,829 93 %
https://static.modelcontextprotocol.io/schemas/2025-09-29/server.schema.json542 3.9 %
https://static.modelcontextprotocol.io/schemas/2025-10-17/server.schema.json322 2.3 %
https://static.modelcontextprotocol.io/schemas/2025-07-09/server.schema.json123 0.9 %
https://static.modelcontextprotocol.io/schemas/2025-09-16/server.schema.json37 0.3 %
https://static.modelcontextprotocol.org/schemas/2025-12-11/server.schema.json2 0.0 %

and 1 more values · not recorded for 6 entries

Repository platform (raw)

13,856
Repository platform (raw)
github13,234 95 %
nothing declared608 4.4 %
gitlab14 0.1 %

not recorded for 6 entries

Repository URL listed

13,862
Repository URL listed
yes13,254 96 %
no608 4.4 %

Icon formats (raw)

13,856
Icon formats (raw)
nothing declared13,293 96 %
image/png405 2.9 %
image/svg+xml102 0.7 %
image/png, image/svg+xml51 0.4 %
image/jpeg3 0.0 %
image/webp2 0.0 %

not recorded for 6 entries

Path argument present

13,862
Path argument present
no13,434 97 %
yes428 3.1 %

Per property, the measured values inside this category. The share refers to the 13,862 entries of the category, not to the registry.

The same category through the interface

curl -s "https://api.tracevero.com/v1/eintraege?art=mcp_server&roh_transportarten=stdio&grenze=200"

The command carries exactly the condition of this page. 13,862 entries at 200 each are 70 requests; the total is in the X-Gesamt header.

Changes to these entries

https://tracevero.com/aenderungen.atom?thema=transport-stdio

Both addresses narrow the change stream to exactly the entries in this category. The feed carries an identifier of its own, so a feed reader keeps it apart from the full stream.

Categories sharing entries with this one

MCP servers available as a package only 14,911 entries in this category13,856 shared Locally executed MCP servers 17,251 entries in this category13,862 shared Local MCP servers with a repository URL 16,336 entries in this category13,254 shared Local MCP servers without declared required secrets 13,393 entries in this category10,965 shared MCP servers over stdio, as an npm package only 8,771 entries in this category8,771 shared Local MCP servers as an npm package only 10,184 entries in this category8,771 shared

Per neighbour its own size and the counted number of shared entries. A category without a single shared entry is not listed here.

tracevero · https://tracevero.com/themen/transport-stdio?seite=91