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alejandrom5170
alejandrom5170
New Participant
Nov 4, 2026 2:32 AM UTC

Appian Dev MCP connection issue: HTTP 404 and lcp-api-plugin = false

I am trying to set up the Appian Dev MCP plugin (v26.9.10) to connect an external AI assistant. The plugin is successfully installed and active in our cloud environment, and the basic OAuth configurations are already in place.

However, when the AI assistant tries to connect, the endpoints /suite/plugins/servlet/stateless/lcp-api/* (for example, /lcp-api/meta) return an HTTP 404 error.

Upon inspecting the application log at the /stateless/lcp-debug/ page, I noticed this flag is set to false:ae.dev-copilot-api.lcp-api-plugin = false

The main "Appian MCP Server" toggle is already enabled in the Admin Console.

Has anyone else encountered this issue? I would like to know if this specific flag implies there is a backend feature toggle that Appian Support needs to activate for our site, or if there is another configuration step we might be missing to resolve the 404 error.

Any guidance would be highly appreciated!

2 replies

mathieud0001
mathieud0001
Genius
Nov 4, 2026 4:06 AM UTC

Appian MCP != Appian Dev MCP

I think we had to flip a toggle in the initial versions. I remember having to email support to have it turned on but I thought that this requirement was removed in later versions though.

 

shubhama926776
shubhama926776
Brainy
Nov 4, 2026 6:29 AM UTC

That false flag means the Dev MCP feature toggle is off on your site, so raise a support case to enable it (the Admin Console Appian MCP Server toggle is a different feature)

https://docs.appian.com/suite/help/26.10/devmcp.html

शुभम्
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