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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.

13,770 servers 33% of 42,239 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 2,951 to 3,000 of 13,770

Entries
OfficeAgent.NETio.github.ilia-sokolov/officeagent
Offline Protocolcom.offlineprotocol/cli
Oh My Androidio.github.ateymoori/oh-my-android
Oh My Posh Configuratorio.github.jamesmontemagno/ohmyposh-configurator
Ollama / vLLM Bridgeio.github.setheerwagen/mcp-ollama-vllm
Olostep MCP Serverio.github.olostep/olostep-mcp-server
OmniClip RAGio.github.EllisMorrow/omniclip-rag-mcp
OmniClip RAGio.github.msjsc001/omniclip-rag-mcp
OmniFocusio.github.steveardis/omnifocus
OmniGlyphio.github.aidi1723/omniglyph
OmniScholario.github.luffysolution-svg/omnischolar
On Boardio.github.swisspra/On_Board
On va où ? Routing APIapp.onvaou/itineraires
Onchain Agent Walletsio.github.nirholas/onchain-agent-wallets
One MCP, many parsersio.github.adelaidasofia/parse-mcp
One Person Company OSio.github.living-hi/one-person-company-os
OneSource MCPio.onesource/mcp
Onexur Manager MCPio.github.onexurOSS/manager-mcp
OnlineAfspraken Slotsio.github.RichieB2B/onlineafspraken-slots
Ontology Atlasio.github.wlsdks/ontology-atlas
Onyx MCPio.github.ByWaleed/onyx-mcp
OokCiteio.github.TurtleTech-ehf/ookcite-mcp
Open & Asynccom.open-and-async/mcp
Open Agent Commonsio.github.wd666430-rgb/open-agent-commons
Open Banking (open-banking.io)io.github.open-banking-io/mcp-server
Open Designio.github.feimacode/open-design
Open Food Facts MCP by UnClickio.github.malamutemayhem/openfoodfacts
Open Investment Modelio.github.antikas/openim
Open Legal Chileio.github.elpabloultron/open-legal-chile
Open Libraryio.github.8enSmith/mcp-open-library
Open Library MCP by UnClickio.github.malamutemayhem/openlibrary
Open Marketsio.github.danchev/openmarkets
Open State: Camping - Parks Canadaio.github.JCrossman/open-state-camping
Open-Meteo Weatherio.github.myAI-2025/openmeteo-mcp
Open-Meteo Weather MCP by UnClickio.github.malamutemayhem/openmeteo
OpenAEOdev.openaeo/audit
OpenAI Imageio.github.mindstone/mcp-server-openai-image
OpenAPI Lintio.github.basitalisandhu/mcp-openapi-lint
OpenAPI Servicesio.github.alyiox/mcp-openapix
OpenAQ Air Quality MCP by UnClickio.github.malamutemayhem/openaq
OpenAdapt Agent (openadapt-flow bridge)io.github.OpenAdaptAI/openadapt-agent
OpenBrandio.github.ethanjyx/openbrand
OpenBusDataio.github.AndrewAubury/openbusdata
OpenClaw Agent Instruction Registryio.github.izworskic/openclaw-registry
OpenClaw Consensusio.github.MICONNM/openclaw-consensus-mcp
OpenF1 MCP by UnClickio.github.malamutemayhem/openf1
OpenFate Bazi MCPio.github.openfate-ai/bazi-mcp
OpenFateAI Assistant MCPio.github.openfateaicom-wq/openfateai-mcp
OpenGraph.io MCP Serverio.github.securecoders/opengraph-io-mcp
OpenGrok MCP Serverio.github.IcyHot09/opengrok

All 13,770 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 13,764 of its 13,770 entries with "MCP servers available as a package only" (14,812). 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

13,770
Required secrets declared
no10,889 79 %
yes2,881 21 %

Schema version of the raw record (raw)

13,764
Schema version of the raw record (raw)
https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json12,746 93 %
https://static.modelcontextprotocol.io/schemas/2025-09-29/server.schema.json539 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.json117 0.8 %
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)

13,764
Repository platform (raw)
github13,143 95 %
nothing declared607 4.4 %
gitlab14 0.1 %

not recorded for 6 entries

Repository URL listed

13,770
Repository URL listed
yes13,163 96 %
no607 4.4 %

Icon formats (raw)

13,764
Icon formats (raw)
nothing declared13,205 96 %
image/png404 2.9 %
image/svg+xml102 0.7 %
image/png, image/svg+xml48 0.3 %
image/jpeg3 0.0 %
image/webp2 0.0 %

not recorded for 6 entries

Path argument present

13,770
Path argument present
no13,351 97 %
yes419 3.0 %

Per property, the measured values inside this category. The share refers to the 13,770 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. 13,770 entries at 200 each are 69 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 14,812 entries in this category13,764 shared Locally executed MCP servers 17,143 entries in this category13,770 shared Local MCP servers with a repository URL 16,232 entries in this category13,163 shared Local MCP servers without declared required secrets 13,303 entries in this category10,889 shared MCP servers over stdio, as an npm package only 8,731 entries in this category8,731 shared Local MCP servers as an npm package only 10,137 entries in this category8,731 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=60