Warning: Failed to install MATLAB MCP Server Toolbox

[mathieuboudreau]

MATLAB Release

R2026b

Operating System

macOS (Apple Silicon)

Agent Platform

Other

Other Agent Platform

No response

MCP Server Version

No response

Steps to Reproduce

Downloaded agenticToolkitInstaller.mltbx.

Opened the file

Ran: setupAgenticToolkit("install")

Expected Behavior

Installs toolkit fully.

Actual Behavior

Received this warning:

  Checking for latest MCP server version...
  Downloading MATLAB MCP Server v0.11.1 for macOS arm64...
  MCP server binary installed to: /Users/mathieuboudreau/.matlab/agentic-toolkits/bin/matlab-mcp-server
  Installing MATLAB MCP Server Toolbox v0.11.1...
Warning: Failed to install MATLAB MCP Server Toolbox:
  Unrecognized function or variable 'knownNames'. 

Additional Context

Full log:

Details

Prerelease License -- for engineering feedback and testing
	purposes only. Not for sale.

Warning: Name is nonexistent or not a directory: /usr/local/fsl/etc/matlab 
> In [path](matlab:matlab.lang.internal.introspective.errorDocCallback('path', '/Applications/MATLAB_R2026b.app/toolbox/matlab/general/path.m', 89)) ([line 89](matlab: opentoline('/Applications/MATLAB_R2026b.app/toolbox/matlab/general/path.m',89,0)))
In [startup](matlab:matlab.lang.internal.introspective.errorDocCallback('startup', '/Users/mathieuboudreau/Documents/MATLAB/startup.m', 7)) ([line 7](matlab: opentoline('/Users/mathieuboudreau/Documents/MATLAB/startup.m',7,0))) 
>> setupAgenticToolkit("install")
Warning: P-code file /Users/mathieuboudreau/Library/Application
Support/MathWorks/MATLAB
Add-Ons/setup_installer_staging@1.1.0/setupAgenticToolkit.p is older than source
code file /Users/mathieuboudreau/Library/Application Support/MathWorks/MATLAB
Add-Ons/setup_installer_staging@1.1.0/setupAgenticToolkit.m.
/Users/mathieuboudreau/Library/Application Support/MathWorks/MATLAB
Add-Ons/setup_installer_staging@1.1.0/setupAgenticToolkit.p may be obsolete and
may need to be regenerated.
Type "help pcode" for information about generating P-code. 

  MathWorks Agentic Toolkit Setup — Install
  —————————————————————————————————————————

  Detected:
    Platform:     macOS arm64
    MATLAB:       R2026b (/Applications/MATLAB_R2026b.app)

  Select toolkits to install:
    1. MATLAB Agentic Toolkit
    2. Simulink Agentic Toolkit
    3. Both

  Enter selection: 3

  Plan:
    - Download and install the MATLAB MCP Server
    - Install the MATLAB MCP Server Toolbox (enables agents to connect to a running MATLAB session)
    - Download the MATLAB Agentic Toolkit
    - Download the Simulink Agentic Toolkit

  Proceed? [Y/n]: y
  Checking for latest MCP server version...
  Downloading MATLAB MCP Server v0.11.1 for macOS arm64...
  MCP server binary installed to: /Users/mathieuboudreau/.matlab/agentic-toolkits/bin/matlab-mcp-server
  Installing MATLAB MCP Server Toolbox v0.11.1...
Warning: Failed to install MATLAB MCP Server Toolbox:
  Unrecognized function or variable 'knownNames'. 
> In [setupAgenticToolkit](matlab:matlab.lang.internal.introspective.errorDocCallback('setupAgenticToolkit'))
In [setupAgenticToolkit](matlab:matlab.lang.internal.introspective.errorDocCallback('setupAgenticToolkit'))
In [setupAgenticToolkit](matlab:matlab.lang.internal.introspective.errorDocCallback('setupAgenticToolkit')) 
  Downloading MATLAB Agentic Toolkit 2026.07.02...
  MATLAB Agentic Toolkit installed to: /Users/mathieuboudreau/.matlab/agentic-toolkits/matlab
  Downloading Simulink Agentic Toolkit 2026.07.02...
  Simulink Agentic Toolkit installed to: /Users/mathieuboudreau/.matlab/agentic-toolkits/simulink
  Merged marketplace.json written (28 plugins).

  Artifacts installed.

  Would you like to configure your coding agent now? [Y/n]:

[michellehirsch]

@mathieuboudreau sorry for these issues. I found the same behavior on my Mac. I force uninstalled everything:

• setupAgenticToolkit("uninstall")
• matlab.addons.uninstall("MathWorks Agentic Toolkit Setup")
• If MATLAB MCP Server Toolbox is still installed, remove it, too: matlab.addons.uninstall("MATLAB MCP Server Toolbox")

And then installation succeeded. Would you mind giving this a try? Please note that while we keep the current installer working as best we can, we are working on a new installer that I'm expecting to alleviate many issues like this.

[mathieuboudreau]

Hi @michellehirsch,

I followed your instructions, and then re-did the agenticToolkitInstaller.mltbx step followed by setupAgenticToolkit("install"), however I get the same error:

  Checking for latest MCP server version...
  Downloading MATLAB MCP Server v0.11.1 for macOS arm64...
  MCP server binary installed to: /Users/mathieuboudreau/.matlab/agentic-toolkits/bin/matlab-mcp-server
  Installing MATLAB MCP Server Toolbox v0.11.1...
Warning: Failed to install MATLAB MCP Server Toolbox:
  Unrecognized function or variable 'knownNames'. 

Might this be an issue with the 2026b pre-release I'm using?

[mathieuboudreau]

Or, maybe this is an issue I should open in https://github.com/matlab/matlab-mcp-server instead?

[michellehirsch]

Thanks, and sorry again. Let's keep the issue here, since I believe it is specific to the installer.

We put in a fix for this issue in yesterday's release. Could you try downloading and installing the latest release? If MATLAB says the version is already installed (hopefully it won't), please uninstall and then install again.

I'll leave this issue open (for a few days, at least) until we get confirmation that the latest release solved the problem you are having.