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MCP servers over stdio

An MCP server is something you connect an agent to. The registry will tell you a server's name, its version and how to reach it — but not what it can do, which is the only thing you actually want to know. We read that off the repository.

31,279 servers, 76,670 tool names across 6,537 of them, last read 11 September 2026.

A server's tools are not in the registry. We read them from the repository README, which means a list here is what the README documented and an absence is usually silence rather than a server with nothing to offer: 20.9% of servers have a list, and filtering on tools narrows to those. Where a list exists, the page for the server says which part of the README it came from.

  1. mcpio.github.refgrow · 18 tools
  2. lightning-enable-mcpio.github.refined-element · 26 tools
  3. syncbridge-mcpio.github.rehmansherazi
  4. mockpostio.github.reiarseni
  5. squireio.github.reidgoodbar
  6. postmd-mcp-serverio.github.reinlainer · 23 tools
  7. sonovaultio.github.rekordcloud · 15 tools
  8. relay-mcpio.github.relayprotocol
  9. multi-mcpio.github.religa
  10. remembraio.github.remembra-ai
  11. appstore-screenshotsio.github.remoas
  12. swiss-health-mcpio.github.remoprinz · 4 tools
  13. custom-mcp-databaseio.github.renanlido · 4 tools
  14. agentic-task-systemio.github.renezander030
  15. graphiti-localio.github.renezander030
  16. meshimize-mcpio.github.renl · 21 tools
  17. rentahumanio.github.rentahuman-ai
  18. qsys-mcpio.github.reowens
  19. rephrasy-mcpio.github.rephrasyai · 2 tools
  20. replenio.github.replenhq
  21. mcpio.github.replynodes · 17 tools
  22. relay-mcpio.github.reservoirprotocol
  23. outage-mcpio.github.reshadat · 5 tools
  24. tmcra-mcp-serverio.github.reshuibuduo · 9 tools
  25. tool-filter-mcpio.github.respawn-app
  26. daleads-mcpio.github.resuly
  27. mcp-serverio.github.retain-so · 7 tools
  28. zetesisio.github.reutavidan
  29. prediction-market-mcpio.github.reviewmyemails
  30. opportunity-mcpio.github.revolutionarybukhari · 6 tools
  31. psx-mcpio.github.revolutionarybukhari
  32. promptrejectormcpio.github.revsmoke
  33. rancher-mcpio.github.rex
  34. insightsentry_mcpio.github.rezmeplxrf
  35. pvpc-mcp-serverio.github.rfdez · 1 tools
  36. docbot-mcpio.github.rflukerii-dev
  37. linux-filesystemio.github.rghsoftware
  38. reportcraftio.github.rharper105
  39. agoragenticio.github.rhein1
  40. linux-mcp-serverio.github.rhel-lightspeed
  41. agy-headless-bridgeio.github.rhishi99
  42. etapa-mcpio.github.rhoneybul
  43. rule-driftio.github.ri7in
  44. volanteio.github.ribato22
  45. docsonario.github.ribhav-jain
  46. mcp-awaitio.github.ricardo-hdrn · 8 tools
  47. netwrightio.github.ricfanin
  48. smart-webio.github.rich-jojo
  49. web-task-apiio.github.rich-jojo
  50. popup-mcpio.github.richard-kim-79
  51. ai2human-mcpio.github.richard7463
  52. cadloop-openscadio.github.richardofortune
  53. cadloop-slicerio.github.richardofortune
  54. tyrekickio.github.richardofortune
  55. statlyteio.github.richardwilkinson9
  56. yapsio.github.richawo
  57. isitdisposable-mcpio.github.richelo · 3 tools
  58. cochlea-mcpio.github.richer-richard
  59. fenestra-mcpio.github.richer-richard
  60. supernote-mcpio.github.ridget · 5 tools
  61. ridvay-mcpio.github.ridvay-ai · 10 tools
  62. rigourio.github.rigour-labs
  63. alertlogic-mcpio.github.rijul170
  64. falcon-mcpio.github.rijul170
  65. qualys-mcpio.github.rijul170
  66. sophos-central-mcpio.github.rijul170
  67. prolog-reasonerio.github.rikarazome · 4 tools
  68. regulatory-signalsio.github.rikocr8orh8
  69. oracle-feeds-mcpio.github.rileybuilds
  70. rillio.github.rillcoin
  71. standupbotio.github.rimysore · 3 tools
  72. projectmemio.github.riponcm
  73. audio-sonic-mcpio.github.ripunjay-kashyap
  74. prompt-compassio.github.rishabhmpc · 1 tools
  75. claude-prompt-optimizerio.github.rishiatlan
  76. ida-pro-mcp-fusionio.github.rison1337
  77. x64dbg-mcpio.github.rison1337
  78. packwright-mcpio.github.rithwikbabu
  79. areacode-mcpio.github.riv-lc · 8 tools
  80. rival-regulatory-toolkitio.github.rival-intelligence
  81. recite-mcpio.github.rivradev
  82. arca-agroio.github.rje1974
  83. interbankingio.github.rje1974
  84. sports-card-agentio.github.rjexile · 9 tools
  85. mcp-yoloio.github.rjn32s · 2 tools
  86. osint-mcpio.github.rjn32s
  87. local-skills-mcpio.github.rkdpa
  88. cosmergonio.github.rkocosmergon
  89. green-mcpio.github.rlawogh1005
  90. outlookio.github.rlrghb
  91. groundtruthio.github.rm-rf-prod
  92. catalyst-edge-mcpio.github.rm0nroe
  93. losbeto-mcpio.github.rmartins1451
  94. ios-sim-mcpio.github.rmathew1973 · 34 tools
  95. ardupilot-mavlink-mcpio.github.rmeadomavic · 9 tools
  96. addsign-mcpio.github.rmindgh
  97. qseow-mcpio.github.rmterenzi
  98. rn-devtools-hubio.github.rn-devtools-hub
  99. wp-mcpio.github.rnaga
  100. mcp-serverio.github.roamzy-io · 12 tools
  101. claude-armyio.github.robbhimself-1337 · 6 tools
  102. mcp-lintio.github.robert19001-cmyk
  103. nooxus-mcpio.github.robertglools
  104. webmcp-todayio.github.robertn702
  105. konidio.github.robertnowell
  106. mcp-ordali-memoryio.github.robin-deruyck
  107. simconnect-mcpio.github.robin24
  108. stripe-mcpio.github.robinafaruqia · 8 tools
  109. cap-shieldio.github.robinlidberg-dot · 6 tools
  110. f5xc-terraform-mcpio.github.robinmordasiewicz
  111. routerio.github.robot-resources
  112. scraperio.github.robot-resources
  113. robo-cortexio.github.robotel-limited
  114. ros-mcp-serverio.github.robotmcp
  115. storyblocksio.github.rocksfrow
  116. agent-mcp-gatewayio.github.roddutra
  117. viralhunt-mcpio.github.rodvan
  118. pmdio.github.roeiba
  119. a11yio.github.rog0x
  120. apiio.github.rog0x · 5 tools
  121. cacheio.github.rog0x · 5 tools
  122. colorio.github.rog0x
  123. configio.github.rog0x · 12 tools
  124. cryptoio.github.rog0x
  125. databaseio.github.rog0x
  126. depio.github.rog0x
  127. dockerio.github.rog0x · 5 tools
  128. docsio.github.rog0x · 11 tools
  129. envio.github.rog0x · 14 tools
  130. fileio.github.rog0x · 5 tools
  131. gitio.github.rog0x · 5 tools
  132. githubio.github.rog0x
  133. i18nio.github.rog0x · 4 tools
  134. imageio.github.rog0x
  135. jsonio.github.rog0x · 7 tools
  136. lintio.github.rog0x · 3 tools
  137. logio.github.rog0x
  138. markdownio.github.rog0x
  139. mathio.github.rog0x · 5 tools
  140. networkio.github.rog0x · 5 tools
  141. npmio.github.rog0x
  142. perfio.github.rog0x · 14 tools
  143. regexio.github.rog0x · 5 tools
  144. schemaio.github.rog0x
  145. seoio.github.rog0x · 6 tools
  146. stringio.github.rog0x · 11 tools
  147. taskio.github.rog0x
  148. testingio.github.rog0x · 18 tools
  149. timeio.github.rog0x · 18 tools
  150. webio.github.rog0x · 5 tools
  151. webhookio.github.rog0x · 3 tools
  152. cudaq-docs-mcpio.github.rogerawong
  153. darwin-memoio.github.rogermsc
  154. rendercheckio.github.rogermsc
  155. mcp-serverio.github.rogertheunissenmerge-oss · 7 tools
  156. mcp-real-estate-serverio.github.rogiervdbrnk
  157. sentinel-execution-mcpio.github.rohith1125 · 40 tools
  158. mcp-ml-labio.github.rohithraju-ops · 5 tools
  159. zettelforgeio.github.rolandpg
  160. arcwall-securityio.github.rom-baro · 7 tools
  161. mcp-openclawio.github.romainsantoli-web
  162. memory-os-aiio.github.romainsantoli-web
  163. agentpayio.github.romudille-bit
  164. fablecutio.github.ronak-create
  165. vivariumio.github.rongchang726-png
  166. geoservercloud-mcpio.github.ronitjadhav
  167. healthchecks-io-mcpio.github.ronniechong
  168. notebooklm-mcpio.github.roomi-fields
  169. osc-bridgeio.github.roomi-fields
  170. rtfmio.github.roomi-fields · 13 tools
  171. flstudio-mcpio.github.rosasynthesiz
  172. mcp-encrypted-sqliteio.github.rosch100 · 7 tools
  173. mcp-sqliteio.github.rosch100 · 7 tools
  174. letmepostio.github.rosekamallove
  175. rosh-mcpio.github.rosh-studio · 9 tools
  176. filesiftio.github.roshunsunder
  177. klawsio.github.rostradamus · 4 tools
  178. fixme-agentio.github.rotem1230
  179. mcp-serverio.github.rotifer-protocol
  180. grounderio.github.rozetyp
  181. jira-alerts-mcpio.github.rrvrs
  182. janeeio.github.rsdouglas · 5 tools
  183. rsk-mcp-serverio.github.rsksmart · 22 tools
  184. multimodalio.github.rsmdt · 5 tools
  185. rstreamio.github.rstreamlabs
  186. pixelvaultio.github.rsweeting1
  187. gatewardsio.github.rtahabas
  188. kci-openapi-mcpio.github.rubato103
  189. nl-openapi-mcpio.github.rubato103
  190. kci-openapi-mcpio.github.rubatoyd
  191. kosis-openapi-mcpio.github.rubatoyd
  192. na-openapi-mcpio.github.rubatoyd
  193. nl-openapi-mcpio.github.rubatoyd
  194. scienceon-mcpio.github.rubatoyd
  195. news-serverio.github.rubtuc
  196. agent-guardrailio.github.rudimentall1
  197. agentic-wallet-guardian-v3io.github.rudimentall1
  198. devmcpio.github.rudranaresh0201
  199. verimcpio.github.rudranaresh0201
  200. mcp-guardianio.github.rudraneel93

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Live servers only. The whole corpus is one call away through the search API — including tools=, which is how you ask for a server by what it does rather than by what it is called.