In April 2025 a user asked whether FlexSim would support MCP (thread). The answer was that there are no plans, but that an idea with concrete use cases would be welcome. This is that idea. What I am asking for: a first-party MCP (Model Context Protocol) server shipped with FlexSim, exposing a documented tool surface over the running application — read the model tree, create and connect objects, create and edit Process Flow activities, read and write labels and properties, run the model, and read statistics. An MCP server is a thin, standard wrapper; the capability it exposes is essentially what FlexScript already does. The value is that any MCP-capable assistant can then work against FlexSim without each of us building and maintaining a private bridge. Use case 1 — model building through Process Flow. Most of the effort in a new model is not insight, it is assembly: laying out activities, wiring resources and lists, setting parameters, repeating a known pattern for the fifth client. An agent that can create Process Flow activities and connect them lets the engineer describe the logic and then spend their time on the part that actually needs judgement — assumptions, data quality, and interpretation. The engineer still reviews and owns every activity; the agent removes the clicking. Use case 2 — auditing and documenting existing models. This is the case I would vote for first. Inherited models are a real cost: a model built by someone who has left, with 200 activities, undocumented labels and a Custom Code block nobody wants to touch. An agent able to read the model tree could explain what a flow does, trace where a label is written and consumed, flag unreachable activities or likely deadlock points at resource acquisition, and generate the handover documentation that almost never gets written. Read-only access alone would deliver most of this. Scope and safety. Read-only tools would already be valuable and are the natural first phase. Write access should be explicit and opt-in, per model or per session, with the server bound locally by default. Nothing here needs to leave the user's machine. Why first-party matters. Third parties have already built FlexSim MCP servers, which shows the demand is real. But private bridges fragment: each one reverse-engineers the same surface, breaks on version updates, and cannot be shared across the community. An official, versioned tool contract is what makes agent-assisted simulation dependable rather than a demo. Show More

Hi, I found there is a RAM problem when FlexSim model calls python scripts -- the arguments passed to python seems not cleaned-up, which accumulate RAM usage, slows down the simulation significantly, and eventually blocked everything.  This is a big problem for my team as we use external python algorithms to process large datasets from simulation. When the RAM are totally used up by FlexSim, we could no longer call the algorithms sufficiently. I use the attached model & script to identify the problem. The model does nothing but passing large inputs to a dummy python script. My RAM got peaked to 32G after 3000 python calls. I further observed that: 1) The complexity of the python script does not worsen the problem 2) The computation data generated internally in python does not worsen the problem 3) The size of the python output does not worsen the problem 4) Cleaning the input in FlexScript (e.g., rewrite it to NULL or use Map.clear()) does not mitigate the problem 5) Cleaning the input in python (e.g., rewrite it to NULL or use del & gc.collect()) does not mitigate the problem So, I feel the problem is only on the model side that the arguments passed to external python are not getting cleaned.  Do you think there is, or will be, a solution?  Thank you Show More

Hello! In several projects, we use network nodes to represent queues and control truck flow. In some models (even in the 2025 version), we're seeing bugs where trucks disappear from nodes and/or "appear out of nowhere" at a point in the NN network. In other models we experience change in the randomness of the replication (even with the same seed). Unfortunately, we can't share the models, but we'd like to show what's happening and understand what might be causing it. One suspicion is that the use of non-passing causes these bugs for some unknown reason. Attached is a video illustrating the truck bug mentioned. Could you help with possible reasons? Show More

Hi, I would like to suggest adding a vertical acceleration parameter for ASRS movement, since I'm facing this limitation in the models I'm currently developing. I've seen a few posts complaining about it, but I think it hasn't been posted as an idea yet. Thanks in advance! Show More

In FlexSim 25.0, BasicFR and BasicTE have been removed from the standard 3d library. I am using them a lot when I teach FlexSim. Please vote to restored them in the standard 3d library. Show More

Hi, in one of my models I use BasicFR objects as representations of some 'virtual' equipment that otherwise only exists as a resource in Process Flow, so that I can track states. I noticed that the state gantt chart no longer works for these when they are added to an MTBF/MTTR that applies only to a subset of states. The attached model demonstrates this. It contains a processor and a BasicFR whose states are changed to a random value every five seconds. A state gantt chart tracks the states of both objects. They are both a member of an MTBF/MTTR. If you run the model in this state, the chart works correctly.   Now change the MTBF to only apply to some state. The chart continues to work for the processor but the state changes of the BasicFR are no longer recognized and the state remains as "other" indefinitely in the chart.   Reverting the change to the MTBF does not fix the chart. It remains 'broken' with respect to the BasicFR even if the MTBF is deleted alltogether. Since the problem does not occur with the processor I can only guess that it might have something to do with the fact that the BasicFR uses a different state change event. But so far I didn't get any further in examining this bug. Any input or possible workaround is appreciated.   Best wishes, Felix Show More

Hi FlexSimmers, This is a common performance measure requirement which is asked by many customers of us. Constructing the utilization vs time is not an easy task also. The user has to create the utilization vs time from the conceptual model which we provide. I believe that this graph will be a useful addition to the dashboard library in the state section.   https://answers.flexsim.com/questions/111045/how-to-graph-utilization-vs-time-in-dashboard.html Regards, Arun KR Show More

Conveyors can be performance inefficient if a model grows too large. Often, conveyor geometry does not match model logic, rendering FlexSim models with an inflated number of unnecessary conveyors. Being able to create polyline conveyors (such as in Anylogic and other simulation software) would reduce the number of conveyor objects, transfers (entry/exit), and unnecessary event listening (conveyor entry/exit). It would also help to produce models faster and less prone to errors due to "conveyor overlap blocking flowitems" caused by conveyor shifts or by the "join conveyors tool". Show More

   I believe that an Augmented Reality (AR) function would significantly enhance Flexsim's value. While the current VR feature provides an immersive virtual world, an AR feature would allow us to overlay simulation models directly onto the real world.   The key benefits of this feature would be: Real-time Optimization and Validation: See real-time data from physical equipment overlaid on the simulation model, allowing for instant validation and on-the-fly optimization. Managers can walk the factory floor and see real-time KPIs and simulated outcomes overlaid on the physical environment, leading to faster, data-rich decisions. Enhanced Training: Employees can interact with virtual equipment in a real-world setting, with the simulation providing visual cues and feedback to accelerate learning. More Impactful Presentations: AR presentations are more compelling than VR screen views. You could project the simulation model directly into client's legacy equipment or physical space, creating a highly interactive and immersive demonstration of your project's value.  I assume that it's possible to create an AR environment using Flexsim's Omniverse feature. However, as far as I know, this approach requires substantial software and hardware resources, which makes it a difficult and often unfeasible solution for many users.   Thank you. Show More

GIS Map route works on FlexSim using two parameters (Duration and Distance). Since we use a TaskExecuter to do this trip, it would be very handy to use TaskExecuter's speed values, varying its trip duration. I think adding a function on GIS Map to consider the TaskExecuter's speed values would be a good improvement to the GIS Map functionality and to the results and statistics got using it. Show More

It would be great if the table editor window allowed users some very basic features: - line/column reordering - paste single value to multiple rows/cols - column filtering Show More

  Would be pretty neat if you could visualize the route that AGVs will take/have taken for a single travel task. This is wrapped up in a module I've developed, so I can't openly share the code, but would be great if it was part of standard FlexSim.   Show More

After updating the Meta (Oculus ) application to the latest version, VR mode in FlexSim does not work. The program closes immediately after it is launched. Show More

Modeling conveyance networks can be complicated and requires precision. Currently, FlexSim only orients conveyors by the coordinates of their starting and ending point coordinates. However, frequently conveyors merge or divert on specific angles. Having measurements or properties for spherical/polar representation of the conveyor segment orientation, using the starting point as the center of coordinates would be extremely helpful. And it is a very simple feature to implement. Show More

It would be great, in the Dashboard Table to have the possibility to color the text or the cell based on the value of another column. Show More

Since the usefulness of a delay 0 is now acknowledged by the new Breathe activity, and given that you almost always want to do a Breathe after a Wait for Event, I propose to add a checkbox "Breathe before releasing token" to the Wait For Event properties and switch it on by default. Show More

It would be great if tables, queries and lists contents could be watched during the debug process: Show More

In general, that would be a value added for our leads & users if the corrected models were available for download for each tutorial. That helps a new user to compare if he has built the model correctly. Some tutorials also act as demo models, you can download the tutorial model to check if this tutorial really matches the features you want to learn / build. In some competitive software, like Anylogic, you can download the corrected model for each tutorial phase. Ex: https://anylogic.help/tutorials/job-shop/1-simple-model.html If FlexSim wants to improve the quality of tutorials, please add a link to download the corrected model for each tutorial in the user manual. Show More

Table interface in FlexSim is very limited. Most of the cases, the column with does not fit the column header or content, making users loose time resizing columns. This is particularly cumbersome when bundle labels are used. Having the tables able to auto-size their column widths either by a right-click menu option or via double click on column limits (like other simulation software, or even Excel) would save a lot of time for users. Show More