OutSystems 11 MCP

Name: OutSystems 11 MCP
Author: OutSystems

Local MCP endpoint inside OutSystems Service Studio for reading and changing O11 modules

Official · OutSystems C# Local · Streamable HTTP Developer tools

GitHub Website

32 popularity score ★ 30

Connect your client

Local (once it is running)

Add in one click

Add to Cursor Add to VS Code Add to LM Studio Add to Goose

Opens the app, which asks before it adds the server.

Or add it by command or config

Claude CodeTerminal

claude mcp add --transport http outsystems-11 http://127.0.0.1:41820/mcp

Cursor~/.cursor/mcp.json

{
  "mcpServers": {
    "outsystems-11": {
      "url": "http://127.0.0.1:41820/mcp"
    }
  }
}

VS Code.vscode/mcp.json

{
  "servers": {
    "outsystems-11": {
      "type": "http",
      "url": "http://127.0.0.1:41820/mcp"
    }
  }
}

Codex~/.codex/config.toml

[mcp_servers.outsystems-11]
url = "http://127.0.0.1:41820/mcp"

Gemini CLITerminal

gemini mcp add --scope user --transport http outsystems-11 http://127.0.0.1:41820/mcp

What it does

OutSystems builds this MCP server into Service Studio, the desktop IDE for OutSystems 11 applications. You start it from the IDE for each session. It then listens on http://127.0.0.1:41820/mcp unless you pick another port in the start dialog, and a coding agent connected to it can inspect the open module: data model, actions, screens, web blocks, roles, themes, settings and validation messages. For anything those reads miss there is a free-form ModelQL query tool. Reading is Generally Available.

Writing is a Beta Feature. The agent sends C# lambdas written against the OutSystems Model API through applyModelApiCode, and they run on a copy of the module. Nothing reaches the real module until omlMerge, which by default opens Service Studio's Compare-and-Merge window so you can review the change (a Service Studio setting can make it merge with no dialog). Separate tools refresh references and run 1-Click Publish.

The GitHub repository holds no server code. What you get there is an agent skill (SKILL.md plus reference files), AGENTS.md, and MCP client configs for Claude Code, Copilot CLI and VS Code, Cursor, Kiro, Antigravity and Codex CLI. Its tool reference lists 57 tools, far more than the README names, and says an older searchModel tool was removed and the old oml_-prefixed names are gone (servicestudio-mcp-oml/reference/verb-reference.md). If port 41820 is busy, the server moves to the next port, trying up to 20 times (MCP-DESIGN-CHOICES.md), so check the URL the dialog shows.

What it needs

Runs on	macOS, Windows, Linux
OutSystems 11	Service Studio 11.55.91 or later with an O11 module open
Also	Service Studio running with its MCP server started from Edit > MCP Server An MCP client that speaks streamable HTTP

Install or update Service Studio to 11.55.91 or later and open the module to work on. Start the server each session from Edit > MCP Server: confirm the port (41820 by default), click Start MCP Server, and copy the URL the dialog shows. Register that URL in your client. The first call from each agent connection shows an approval prompt in Service Studio. The bundled skill installer scripts need git and bash or PowerShell, and install for Claude Code only.

Limits

Early release Writes (applyModelApiCode, omlMerge, omlReset, omlRefreshReferences, omlPublish) are Beta and may change or be withdrawn between Service Studio releases
Not covered Works only on modules open in Service Studio. OutSystems 11 only, not ODC apps
Limit Does not start on its own. Clients get ConnectionRefused until it is started from Edit > MCP Server
Limit Port 41820 by default. If busy it moves up, trying up to 20 times, so the URL can differ
Limit Writes time out after 300 s and reads after 120 s
Limit Edits made in the IDE during an unmerged chain are not seen by the agent
Limit Starting Service Studio wipes %TEMP%\ServiceStudio.MCPServer, where staged module files live
Limit omlPublish returns blocked until the user allows automatic merge and publish in the MCP Server dialog
Not covered The Reactive and Mobile UI reads return nothing on Traditional Web modules, which have their own Traditional tools

Writes (applyModelApiCode, omlMerge, omlReset, omlRefreshReferences, omlPublish) are Beta and may change or be withdrawn between Service Studio releases under the OutSystems Beta Features Agreement. It works only on the module open in Service Studio; it does not start automatically, and clients get ConnectionRefused until it is started. Edits made in the IDE during an unmerged chain are invisible to the agent. Writes time out after 300 s and reads after 120 s. Starting Service Studio wipes %TEMP%\ServiceStudio.MCPServer, where staged module files live. omlPublish returns blocked until the user grants publish permission in the MCP dialog. It covers OutSystems 11 only, not ODC.

Who it suits

It suits OutSystems 11 teams who want a coding agent to explain, document or audit existing modules, and, accepting Beta status, to draft entities, screens and actions that they then review in Compare-and-Merge. Because it runs inside Service Studio on the developer's machine, it fits on-premises and air-gapped estates. It is no use without a Service Studio licence and an O11 module, cannot run headless or in CI, and does not reach OutSystems Developer Cloud (ODC) apps.

Tools 57

52 only read, 5 change things. A ? marks an optional parameter.

applyModelApiCode changes: Compiles and runs a C# Model API lambda against a copy of the open module to change it (Beta)eSpaceName: stringcode: stringimports: array
createSessionToken: Requests the session token that later calls carry and shows the approval promptclientName?: string
listApps: Lists the open module and its loaded references with their module type
omlMerge changes: Merges a changed module file into the live module in Service Studio (Beta)eSpaceName: stringmutatedOmlPath: string
omlReset changes: Discards a module's unmerged chain of staged edits; the staged file stays on disk (Beta)eSpaceName: string
omlRefreshReferences changes: Refreshes every reference of the live module to its latest version (Beta)eSpaceName: string
omlPublish changes: Runs 1-Click Publish on the live module and waits for the result (Beta)eSpaceName: string
getDataModel: Returns entities, attributes and foreign keys as Model API codeeSpaceName: stringincludeJson: enum
getStructures: Returns all structures and their attributeseSpaceName: stringincludeJson: enum
getActionNames: Lists server, client or service action nameseSpaceName: stringobjectType: enum
getServerAction: Returns one server action with its floweSpaceName: stringobjectName: stringincludeJson: enum
getClientAction: Returns one client action by nameeSpaceName: stringobjectName: stringincludeJson: enum
getServiceAction: Returns one service action by nameeSpaceName: stringobjectName: stringincludeJson: enum
getEvents: Returns the module's global eventseSpaceName: stringincludeJson: enum
getEventHandlers: Returns the module's global event handlerseSpaceName: stringincludeJson: enum
getTimers: Returns the module's timerseSpaceName: stringincludeJson: enum
getIntegrations: Returns exposed and consumed REST, SOAP and SAP integrations as codeeSpaceName: stringincludeJson: enum
getScreenNames: Lists Reactive or Mobile screen nameseSpaceName: string
getScreen: Returns one screen's layout, widgets and actionseSpaceName: stringobjectName: stringincludeJson: enum
getWebBlockNames: Lists web block nameseSpaceName: string
getWebBlock: Returns one web block by nameeSpaceName: stringobjectName: stringincludeJson: enum
getThemeNames: Lists theme nameseSpaceName: string
getTheme: Returns one theme by nameeSpaceName: stringobjectName: stringincludeJson: enum
getEmailTemplateNames: Lists email template nameseSpaceName: string
getEmailTemplate: Returns one email template by nameeSpaceName: stringobjectName: stringincludeJson: enum
getExternalSiteNames: Lists external site nameseSpaceName: string
getExternalSite: Returns one external site by nameeSpaceName: stringobjectName: stringincludeJson: enum
getScreenNamesTraditional: Lists screen names in a Traditional Web moduleeSpaceName: string
getScreenTraditional: Returns one Traditional Web screen as codeeSpaceName: stringobjectName: stringincludeJson: enum
getWebBlockNamesTraditional: Lists web block names in a Traditional Web moduleeSpaceName: string
getWebBlockTraditional: Returns one Traditional Web block as codeeSpaceName: stringobjectName: stringincludeJson: enum
getThemeNamesTraditional: Lists theme names in a Traditional Web moduleeSpaceName: string
getThemeTraditional: Returns one Traditional Web theme as codeeSpaceName: stringobjectName: stringincludeJson: enum
getEmailTemplateNamesTraditional: Lists email template names in a Traditional Web moduleeSpaceName: string
getEmailTemplateTraditional: Returns one Traditional Web email template as codeeSpaceName: stringobjectName: stringincludeJson: enum
getExternalSiteNamesTraditional: Lists external site names in a Traditional Web moduleeSpaceName: string
getExternalSiteTraditional: Returns one Traditional Web external site as codeeSpaceName: stringobjectName: stringincludeJson: enum
getSettings: Returns the module's site properties and settingseSpaceName: stringincludeJson: enum
getRoleNames: Lists role nameseSpaceName: string
getRole: Returns one role by nameeSpaceName: stringobjectName: stringincludeJson: enum
getRoleExceptions: Returns the module's role exceptionseSpaceName: stringincludeJson: enum
getUserExceptions: Returns the module's user exceptionseSpaceName: stringincludeJson: enum
getException: Returns one exception by nameeSpaceName: stringobjectName: stringincludeJson: enum
getResourceNames: Lists resource nameseSpaceName: string
getResource: Returns one resource by nameeSpaceName: stringobjectName: stringincludeJson: enum
getImageNames: Lists image nameseSpaceName: string
getImage: Returns one image by nameeSpaceName: stringobjectName: stringincludeJson: enum
getScriptNames: Lists script nameseSpaceName: string
getScript: Returns one script by nameeSpaceName: stringobjectName: stringincludeJson: enum
getLocales: Returns the module's localeseSpaceName: stringincludeJson: enum
getClientVariables: Returns the module's client variableseSpaceName: stringincludeJson: enum
getSessionVariables: Returns the module's session variableseSpaceName: stringincludeJson: enum
runQuery: Runs a ModelQL query against the module for anything the other reads misseSpaceName: stringquery: stringexecutionOptions?: object
getValidationMessages: Returns TrueChange validation messages, optionally filtered by leveleSpaceName: stringfilter?: array
getSerializedObject: Returns the raw JSON serialization of the current objecteSpaceName: string
getSerializedObjectByKey: Returns the raw JSON of an object found by its keyeSpaceName: stringobjectKey: string
getSerializedObjectByNameAndType: Returns the raw JSON of an object found by name and typeeSpaceName: stringobjectName: stringobjectType: string

Popularity

32 popularity score

★ 30

GitHub stars	30	17.9 points
Stars in 30 days	+15	6 points
Official server	Yes	8 points

Measured 2026-11-07. How the score works.

Where it is published

Code	outsystems/outsystems11-mcp ★ 30

What it can reach

Runs	On your machine
Reaches	Your code, Files on your machine
Changes things	Yes: it can write, send, create or delete
Sign-in	Other
Licence	MIT (GitHub)
Last code change	2026-10-29

The server runs inside Service Studio on your machine, listens on 127.0.0.1 only, and needs no API key: each MCP connection, including reconnects, triggers an approval prompt in Service Studio, and calls then carry a session token. Once approved, applyModelApiCode compiles and runs C# the agent sends with Service Studio's privileges; a sandbox rejects code using System.*, Console, reflection, file, process or network access before compiling. Staged module copies are written to %TEMP%\ServiceStudio.MCPServer and left on disk after a reset. omlMerge changes the live module and omlPublish deploys it to your OutSystems environment once the user grants publish permission. The agent's own model calls go over the network; the server does not.

Over time

GitHub stars 30 +15 (+100 %)

3015

13 Oct 20267 Nov 2026

Popularity score 32 +18 (+122 %)

3214

13 Oct 20267 Nov 2026

What is rising across the directory

Sources

Page checked 2026-10-29.

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Connect your client

Add in one click

Or add it by command or config

What it does

What it needs

Limits

Who it suits

Tools 57

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