Appian DevMCP Server Configuration Question

Did you check the mcp.json file and ensure that the authentication method is set to browser-based login? When configured correctly, it will open Chrome and prompt you to sign in using your Appian credentials. The MCP server will then use that authenticated browser session for subsequent requests.

Concerning the auth, it is configured in the mcp.json: https://docs.appian.com/suite/help/26.7/devmcp.html#mcp-configuration-json

Are you using SSO or Basic Auth?

2 answers.  One I am using basic auth.   I have this in the claude json file:

      "env": {

          "LCP_URL": "https://xxxxxx.appiancloud.com",

          "LCP_API_PATH": "/suite/plugins/servlet/stateless/lcp-api",

          "LCP_USERNAME": "MCPTest",

          "LCP_PASSWORD": "xxxxx"

      }

In the log file, it shows this as the username:

INFO:lcp_mcp_server.server:Auth: basic
INFO:lcp_mcp_server.server:Username: MikePrentice
INFO:lcp_mcp_server.server:LCP MCP Server initialization complete

So the user name is not right.

I tried the browser, and pointed me to the problem that I cannot figure out.  Somewhere in the MCP configuration I have MikePrentice defined as the username.  Despite what the claude file says.  I logged in through the browser and Claudes says the names dont match.  It expected MikePrentice but I logged in as mprentice.  

I searched the entire directory of the DevMCP directory and I no matches, so where is this setting?

Which Claude are you doing this from (Terminal or the desktop app)? Windows or Mac?

Windows 11, Claude Desktop

Config should be here: %APPDATA%\Claude\claude_desktop_config.json

Can you post the full contents of this file?

Yes, been modifying that file a lot :)  I have both MCP configured.  I also tried a different approach and I created the user it is looking for.  That changed the error:  APNX-1-4187-000: Authentication failed. Please check your credentials and try again.

{

    "mcpServers": {

    "pyramidappiandevmcp": {

       "command": "uv",

      "args": [

        "run",

        "--directory",

        "c:/AppianDevMCP/src/lcp_mcp_server",

        "python",

        "-m",

        "lcp_mcp_server"

      ],

      "env": {

          "LCP_URL": "https://pyramidsolutions.appiancloud.com",

          "LCP_API_PATH": "/suite/plugins/servlet/stateless/lcp-api",

            "LCP_USERNAME": "MikePrentice",

            "LCP_PASSWORD": "xxxxxx"

      }

    },

    "pyramidappian": {

      "command": "C:\\PROGRA~1\\nodejs\\npx.cmd",

      "args": [

        "mcp-remote",

        "https://pyramidsolutions.appiancloud.com/mcp",

        "--header",

        "Authorization:Bearer ${APPIAN_API_KEY}"

      ],

      "env": {

        "APPIAN_API_KEY": "xxx"

      }

    }

  },

  "coworkUserFilesPath": "C:\\Users\\mprentice\\Claude",

  "preferences": {

    "launchPreviewPersistedWorkspaces": [],

    "launchPreviewSessionScopedSessions": [],

    "coworkScheduledTasksEnabled": true,

    "coworkHipaaRestricted": false,

    "ccdScheduledTasksEnabled": true,

    "sidebarMode": "chat",

    "bypassPermissionsGateByAccount": {

      "5d918861-014d-4c21-8127-2d79382e957d": true

    },

    "coworkWebSearchEnabled": false,

    "coworkModelAutoFallbackByAccount": {

      "5d918861-014d-4c21-8127-2d79382e957d": true

    },

    "remoteToolsDeviceName": "xxx",

    "epitaxyPrefs": {

      "desktop-frame.paneStore.v1": {

        "state": {

          "extraPanesByMode": {},

          "colWeightsByMode": {},

          "rowSplit": 0.5,

          "draftNonce": 0

        },

        "version": 4

      },

      "starred-local-code-sessions": [],

      "starred-cowork-spaces": [],

      "starred-session-groups": [],

      "dframe-group-scopes": {},

      "dframe-local-slice": {

        "pinnedOrder": [],

        "homeProjectsPinnedOrder": []

      },

      "ccd-sessions-filter": {

        "state": {

          "selectedProjects": []

        },

        "version": 0

      }

    }

  }

}

OK - so now you have a new user called MikePrentice?

Did you gave it Designer rights?

Did you change the password on first login?

Yes, and password is all reset and I validated I can log in in a browser.  And yes they are in the Designer group.  I made the account a Sys Admin to try and remove permission issues.

FYI, if I use the Browser login it works.  There is obviously something not working with the id/password in the config file.  I would still like to know where it is pulling that username from.