# \#swarm-agent **URL:** https://forums.unrealengine.com/tag/swarm-agent/4178.md [Latest](https://forums.unrealengine.com/latest.md) · [Categories](https://forums.unrealengine.com/categories.md) · [Tags](https://forums.unrealengine.com/tags.md) --- ## [\[TOOL/PLUGIN\] VERA — In-Editor AI Agent for Unreal Engine 5.7 & 5.8 (7 LLM Providers, Viewport Vision, Open Source)](https://forums.unrealengine.com/t/tool-plugin-vera-in-editor-ai-agent-for-unreal-engine-5-7-5-8-7-llm-providers-viewport-vision-open-source/2738556)
**Author:** [@Ezesubu](https://forums.unrealengine.com/u/Ezesubu)\ **Replies:** 2\ **Last updated:** [October 24, 2026, 2:19am UTC](https://forums.unrealengine.com/t/tool-plugin-vera-in-editor-ai-agent-for-unreal-engine-5-7-5-8-7-llm-providers-viewport-vision-open-source/2738556 "2026-10-24T02:19:00Z")
Hi everyone! :waving\_hand: I’m excited to share VERA (Virtual Engine Reasoning Agent) — an open-source AI co-pilot that lives directly inside the Unreal Editor. Unlike external chatbots that force you to copy & pas… --- ## [How do I build lighting locally on Linux?](https://forums.unrealengine.com/t/how-do-i-build-lighting-locally-on-linux/2191378)
**Author:** [@Kaneda](https://forums.unrealengine.com/u/Kaneda)\ **Replies:** 4\ **Last updated:** [November 16, 2025, 12:25pm UTC](https://forums.unrealengine.com/t/how-do-i-build-lighting-locally-on-linux/2191378 "2025-11-16T12:25:06Z")
According to Epic’s documentation on Swarm Agent: Currently, Swarm Agent and Coordinator are only supported for Windows. Light builds on Mac and Linux will only build locally. How do I build locally? If I use Build \> … --- ## [Add Swarm Agent back to UE5.6](https://forums.unrealengine.com/t/add-swarm-agent-back-to-ue5-6/2634718)
**Author:** [@jkinz3](https://forums.unrealengine.com/u/jkinz3)\ **Replies:** 0\ **Last updated:** [August 8, 2025, 11:56am UTC](https://forums.unrealengine.com/t/add-swarm-agent-back-to-ue5-6/2634718 "2025-08-08T11:56:06Z")
I haven’t seen any epic devs comment on this but Swarm Agent is missing from 5.6 and the only way to utilize static lighting is to download a previous version and copy/paste the exe into 5.6. Since Epic isn’t deprecating… --- ## [Skylight radiosity taking too much time](https://forums.unrealengine.com/t/skylight-radiosity-taking-too-much-time/414879)
**Author:** [@Vasev](https://forums.unrealengine.com/u/Vasev)\ **Replies:** 4\ **Last updated:** [July 3, 2025, 3:48pm UTC](https://forums.unrealengine.com/t/skylight-radiosity-taking-too-much-time/414879 "2025-07-03T15:48:54Z")
Hi, So recently I noticed black lines in my swarm agent and once I hover my mouse over them, it says “skylight radiosity”. So I’m facing an issue with the scene I’m currently working on. It’s an arch viz interior walkth… --- ## ["Failed to Connect to Swarm"](https://forums.unrealengine.com/t/failed-to-connect-to-swarm/464809)
**Author:** [@NegativeTerminal](https://forums.unrealengine.com/u/NegativeTerminal)\ **Replies:** 10\ **Last updated:** [June 5, 2025, 4:59pm UTC](https://forums.unrealengine.com/t/failed-to-connect-to-swarm/464809 "2025-06-05T16:59:17Z")
Hey, I am having an issue with “failed to connect to swarm” I have tried everything I can find on the web inc. legacy wiki to fix it. I have tried uninstalling my firewall, I tried forwarding the ports in the firewall f… --- ## [Swarm agent connection issues](https://forums.unrealengine.com/t/swarm-agent-connection-issues/474564)
**Author:** [@TheBatWithTheHat](https://forums.unrealengine.com/u/TheBatWithTheHat)\ **Replies:** 1\ **Last updated:** [January 22, 2025, 8:32pm UTC](https://forums.unrealengine.com/t/swarm-agent-connection-issues/474564 "2025-01-22T20:32:06Z")
Hi All, we are having some issues with using swarm. Basically what we are getting is that is distributing on the local machine that is running the lightmass build and it shows this message on the agent of any remote ma… --- ## [Swarm connection issues](https://forums.unrealengine.com/t/swarm-connection-issues/347613)
**Author:** [@anonymous\_user\_d2ea700b](https://forums.unrealengine.com/u/anonymous_user_d2ea700b)\ **Replies:** 2\ **Last updated:** [December 11, 2024, 9:44pm UTC](https://forums.unrealengine.com/t/swarm-connection-issues/347613 "2024-12-11T21:44:02Z")
HI, im having issues with swarm not connecting properly. i can see all agents in the co-coordinator but mostly they wont start when i hit build. or if they do start then they fail almost immediate and disconnect. i can… --- ## [Lighting not building. Swarm seems to be the cause](https://forums.unrealengine.com/t/lighting-not-building-swarm-seems-to-be-the-cause/311775)
**Author:** [@anonymous\_user\_a723da02](https://forums.unrealengine.com/u/anonymous_user_a723da02)\ **Replies:** 25\ **Last updated:** [July 4, 2024, 6:41am UTC](https://forums.unrealengine.com/t/lighting-not-building-swarm-seems-to-be-the-cause/311775 "2024-07-04T06:41:00Z")
Hi there. I am having trouble building my lighting in 4.7.3. It simply will not build at all. I get a Starting up Swarm Connection dialogue box for a split second followed by nothing. So far I have attempted: Uninstal… --- ## [Navmesh AI not moving](https://forums.unrealengine.com/t/navmesh-ai-not-moving/440580)
**Author:** [@Vokzole](https://forums.unrealengine.com/u/Vokzole)\ **Replies:** 8\ **Last updated:** [April 19, 2024, 3:11am UTC](https://forums.unrealengine.com/t/navmesh-ai-not-moving/440580 "2024-04-19T03:11:10Z")
Hello everyone, I am currently trying to create a Pacman project and am in the process of making the ghosts follow the player. In this case, I have already created a navmesh bounds volume encompassing the walkable paths… --- ## [Lighting Build Fail Swarm Error \[Interface:OpenJob\] Error: Invalid class](https://forums.unrealengine.com/t/lighting-build-fail-swarm-error-interface-openjob-error-invalid-class/482814)
**Author:** [@anonymous\_user\_4f9036e6](https://forums.unrealengine.com/u/anonymous_user_4f9036e6)\ **Replies:** 4\ **Last updated:** [March 18, 2024, 11:50am UTC](https://forums.unrealengine.com/t/lighting-build-fail-swarm-error-interface-openjob-error-invalid-class/482814 "2024-03-18T11:50:58Z")
Decided to continue work on one of my projects today and was unable to build the lighting. I clicked “build lighting only” then got the “Lighting build failed.” error popup in the corner. The Message Log didn’t come up … --- ## [Worldsettings\_1 Maps need lighting rebuilt](https://forums.unrealengine.com/t/worldsettings-1-maps-need-lighting-rebuilt/484237)
**Author:** [@beatricevictoria](https://forums.unrealengine.com/u/beatricevictoria)\ **Replies:** 1\ **Last updated:** [December 6, 2023, 2:24pm UTC](https://forums.unrealengine.com/t/worldsettings-1-maps-need-lighting-rebuilt/484237 "2023-12-06T14:24:44Z")
I keep getting this error everytime I try to build my scene. I’ve tried to go into the Swarm agent, validating then clearing cache; and that worked when I had another error ‘lightmass crahsed’. But nothing seems to wo… --- ## [How do I determine Agent properties in an OnDamaged event?](https://forums.unrealengine.com/t/how-do-i-determine-agent-properties-in-an-ondamaged-event/1294459)
**Author:** [@TheDadXI](https://forums.unrealengine.com/u/TheDadXI)\ **Replies:** 5\ **Last updated:** [September 15, 2023, 1:19pm UTC](https://forums.unrealengine.com/t/how-do-i-determine-agent-properties-in-an-ondamaged-event/1294459 "2023-09-15T13:19:57Z")
I have subscribed to a prop\_manipulator\_device… PropManipulator.DamagedEvent.Subscribe(OnPropDamaged) I’d like to determine what ammo was used to cause the damage (if possible)… but to debug, I’d just like to see all pr… --- ## [Swarm Lighting Build Fails in Source Build. "Failed to cache the required dependancy" HELP!](https://forums.unrealengine.com/t/swarm-lighting-build-fails-in-source-build-failed-to-cache-the-required-dependancy-help/793310)
**Author:** [@Kinglumps](https://forums.unrealengine.com/u/Kinglumps)\ **Replies:** 0\ **Last updated:** [March 17, 2023, 11:53pm UTC](https://forums.unrealengine.com/t/swarm-lighting-build-fails-in-source-build-failed-to-cache-the-required-dependancy-help/793310 "2023-03-17T23:53:33Z")
I’ve been trying to build lighting in a source build of UE 5.1 but I keep getting “Lighting Build Failed” after starting the Swarm Connection. I’ve rebuilt UnrealLightmass and followed all the solutions listed at the bot… --- ## [Lighting won't build (KBM & other solutions already tried)](https://forums.unrealengine.com/t/lighting-wont-build-kbm-other-solutions-already-tried/489997)
**Author:** [@hperk209](https://forums.unrealengine.com/u/hperk209)\ **Replies:** 1\ **Last updated:** [August 9, 2022, 8:28am UTC](https://forums.unrealengine.com/t/lighting-wont-build-kbm-other-solutions-already-tried/489997 "2022-08-09T08:28:53Z")
Hi! Thanks in advance to anyone taking a look. I know your instinct will be to point me to existing articles on this, as there are many. But of the dozens I’ve searched (both official and unofficial), no solution has wo… --- ## [Swarm agent insisting on executing jobs locally](https://forums.unrealengine.com/t/swarm-agent-insisting-on-executing-jobs-locally/434628)
**Author:** [@baltauger](https://forums.unrealengine.com/u/baltauger)\ **Replies:** 2\ **Last updated:** [June 20, 2022, 10:50am UTC](https://forums.unrealengine.com/t/swarm-agent-insisting-on-executing-jobs-locally/434628 "2022-06-20T10:50:41Z")
We have a very fast, high core count machine set up on the network specifically dedicated to bake lights. This remote machine accepts jobs normally over the network, no problem there. However, Swarm insists on running l… --- ## [SwarmAgent stopping with error](https://forums.unrealengine.com/t/swarmagent-stopping-with-error/357080)
**Author:** [@dluchau](https://forums.unrealengine.com/u/dluchau)\ **Replies:** 7\ **Last updated:** [May 19, 2022, 10:29pm UTC](https://forums.unrealengine.com/t/swarmagent-stopping-with-error/357080 "2022-05-19T22:29:22Z")
Hi, I’m trying to build lighting for my project with 5249 unbuilt objects with “Preview” quality and lightmap res set to 4 on all foliage. I’ve built lightning successfully many times in this project before, but when t… --- ## [How to update SwarmAgent.exe.config?](https://forums.unrealengine.com/t/how-to-update-swarmagent-exe-config/354671)
**Author:** [@ahmad\_moradian](https://forums.unrealengine.com/u/ahmad_moradian)\ **Replies:** 7\ **Last updated:** [May 3, 2022, 9:43am UTC](https://forums.unrealengine.com/t/how-to-update-swarmagent-exe-config/354671 "2022-05-03T09:43:42Z")
I am using Unreal Engine 4.9. When I try to use the Build icon to calculate the lighting it appears a Fatal Error window which contains this message: Could not create cache folder C:\\Program Files\\Unreal Engine 4.9\\Unre… --- ## [Swarm performance using old servers](https://forums.unrealengine.com/t/swarm-performance-using-old-servers/504072)
**Author:** [@ZoguBK](https://forums.unrealengine.com/u/ZoguBK)\ **Replies:** 0\ **Last updated:** [March 4, 2022, 4:25pm UTC](https://forums.unrealengine.com/t/swarm-performance-using-old-servers/504072 "2022-03-04T16:25:14Z")
Hi, For the purpose of speeding up light building we got 2 used servers with 2 Xeon E5-2695 V2 (12 core 24 threads) processors each. Beside them we have also 2 desktops with i9-11900F (8 cores 16 threads). Every mach… --- ## [SwarmAgent problem with agents ](https://forums.unrealengine.com/t/swarmagent-problem-with-agents/504064)
**Author:** [@jova1208](https://forums.unrealengine.com/u/jova1208)\ **Replies:** 0\ **Last updated:** [March 4, 2022, 4:04pm UTC](https://forums.unrealengine.com/t/swarmagent-problem-with-agents/504064 "2022-03-04T16:04:13Z")
Hi, i have problem with my SwarmAgent, I will add picture so if someone can explain me why this happen when i start baking lights. To be more precise i have two server machines Dell PowerEdge R620 each of them has 2x In… --- ## [Swarm Agent error - "Configuration System failed to initialize" - 4.27.2](https://forums.unrealengine.com/t/swarm-agent-error-configuration-system-failed-to-initialize-4-27-2/498126)
**Author:** [@Raging\_Paper-Cut](https://forums.unrealengine.com/u/Raging_Paper-Cut)\ **Replies:** 0\ **Last updated:** [February 15, 2022, 2:17am UTC](https://forums.unrealengine.com/t/swarm-agent-error-configuration-system-failed-to-initialize-4-27-2/498126 "2022-02-15T02:17:04Z")
Hello, I am running into an issue with the UE4 editor - specifically the Swarm Agent. This happens when trying to build my level or do any type of lighting build. The UE4 editor gets to “starting Swarm agent” then freez… --- ## [Azure Swarm Agent](https://forums.unrealengine.com/t/azure-swarm-agent/319332)
**Author:** [@anonymous\_user\_312aa286](https://forums.unrealengine.com/u/anonymous_user_312aa286)\ **Replies:** 2\ **Last updated:** [February 7, 2022, 11:28am UTC](https://forums.unrealengine.com/t/azure-swarm-agent/319332 "2022-02-07T11:28:29Z")
Greetings, Is there a way to implement Azure in Swarm Agent? I’ve kept searching on how i can implement it but end out finding nothing of what i am looking for. Thanks! --- ## [Lights won't build but SwarmAgent launches](https://forums.unrealengine.com/t/lights-wont-build-but-swarmagent-launches/490931)
**Author:** [@DriesBatens](https://forums.unrealengine.com/u/DriesBatens)\ **Replies:** 0\ **Last updated:** [November 15, 2021, 1:22pm UTC](https://forums.unrealengine.com/t/lights-wont-build-but-swarmagent-launches/490931 "2021-11-15T13:22:43Z")
Hi, I got a problem with my project that my lights won’t build in the project. I use Unreal Engine 4.26. On the other hand, I do see in SwarmAgent that a process is being carried out in this. When this process is compl… --- ## [Swarm Agent \[Error\]](https://forums.unrealengine.com/t/swarm-agent-error/490359)
**Author:** [@ChrisRapid94](https://forums.unrealengine.com/u/ChrisRapid94)\ **Replies:** 0\ **Last updated:** [October 28, 2021, 2:16pm UTC](https://forums.unrealengine.com/t/swarm-agent-error/490359 "2021-10-28T14:16:10Z")
Hi, I have a problem with Swarm Agent when building light in Unreal Engine 4 4.27.1. When I go to build light only I get a window popping up mentioning that the build status - Starting up Swarm Connection…(100%) and the… --- ## [What does "Light build failed. Swarm Agent failed to kick off" mean, and How can I fix it?](https://forums.unrealengine.com/t/what-does-light-build-failed-swarm-agent-failed-to-kick-off-mean-and-how-can-i-fix-it/488125)
**Author:** [@JankoPapa](https://forums.unrealengine.com/u/JankoPapa)\ **Replies:** 4\ **Last updated:** [August 28, 2021, 6:37pm UTC](https://forums.unrealengine.com/t/what-does-light-build-failed-swarm-agent-failed-to-kick-off-mean-and-how-can-i-fix-it/488125 "2021-08-28T18:37:05Z")
Hello! I would like to ask that when I want to unbuild my project, it says “Light build failed. Swarm Agent failed to kick off”. How can I fix the problem? I have built my UE4 project in Blueprint (Epic Games Installer)… --- ## [Does UE4 / Swarm Require a "D" Drive?](https://forums.unrealengine.com/t/does-ue4-swarm-require-a-d-drive/344728)
**Author:** [@anonymous\_user\_5d3a4972](https://forums.unrealengine.com/u/anonymous_user_5d3a4972)\ **Replies:** 24\ **Last updated:** [August 19, 2021, 8:01pm UTC](https://forums.unrealengine.com/t/does-ue4-swarm-require-a-d-drive/344728 "2021-08-19T20:01:49Z")
Hello, I am currently experiencing issues with building lighting. When I initiate a build, Unreal gets stuck at “Gathering Scene Geometry” I looked toward the Swarm Agent and discovered this error in the log: 2:25:20 P… --- ## [Build lighting stuck at 33% on Windows 10](https://forums.unrealengine.com/t/build-lighting-stuck-at-33-on-windows-10/487147)
**Author:** [@KaczkaJestem](https://forums.unrealengine.com/u/KaczkaJestem)\ **Replies:** 0\ **Last updated:** [August 9, 2021, 10:19pm UTC](https://forums.unrealengine.com/t/build-lighting-stuck-at-33-on-windows-10/487147 "2021-08-09T22:19:01Z")
Hi, I’ve seen that there are already many questions around that topic in here, but every one seems to be a little bit different, since none of the workarounds or fixes that I have found worked in my case. The actual pro… --- ## [Swarm Failed to Kick Off. Rebuild Unreal Lightmass](https://forums.unrealengine.com/t/swarm-failed-to-kick-off-rebuild-unreal-lightmass/486272)
**Author:** [@LNL227](https://forums.unrealengine.com/u/LNL227)\ **Replies:** 0\ **Last updated:** [July 16, 2021, 2:33am UTC](https://forums.unrealengine.com/t/swarm-failed-to-kick-off-rebuild-unreal-lightmass/486272 "2021-07-16T02:33:42Z")
I can’t fix this problem even I clear the cache folder still didn’t work. I am currently using the launcher version of unreal engine and cannot find any solution because mostly are using the source build. --- ## [Fix RunUAT.bat](https://forums.unrealengine.com/t/fix-runuat-bat/483568)
**Author:** [@anonymous\_user\_e56257d6](https://forums.unrealengine.com/u/anonymous_user_e56257d6)\ **Replies:** 0\ **Last updated:** [May 18, 2021, 2:29pm UTC](https://forums.unrealengine.com/t/fix-runuat-bat/483568 "2021-05-18T14:29:30Z")
How can we fix it, we used RunUAT.bat BuildCookRun -project="E:\\agent\\\_work\\1\\s\\P1.uproject" -clientconfig=Development -platform=Win64 -cook -stage -pak -stagingdirectory="E:\\agent\\\_work\\1\\s\\" -package -build to compile … --- ## [ライティングのビルドをするとSwarm Agentのログでエラーが発生する](https://forums.unrealengine.com/t/swarm-agent/482748)
**Author:** [@naoki.kimura](https://forums.unrealengine.com/u/naoki.kimura)\ **Replies:** 0\ **Last updated:** [May 1, 2021, 10:02am UTC](https://forums.unrealengine.com/t/swarm-agent/482748 "2021-05-01T10:02:44Z")
ライティングのビルドをするとSwarm Agentのログで以下のエラーが発生します。 設置したスタティックメッシュの数が少ない内は以下のエラーが発生しつつもビルドが成功するのですが、スタティックメッシュが10000を超え始めるとライティングビルドが強制終了します。 解決方法はありますか？ Failed to determine engine directory: Defaulting to …/…/…/Engine/ Fail… --- ## [Swarm CPU/Core/Thread Limit](https://forums.unrealengine.com/t/swarm-cpu-core-thread-limit/303734)
**Author:** [@LeFxGuy](https://forums.unrealengine.com/u/LeFxGuy)\ **Replies:** 3\ **Last updated:** [April 28, 2021, 6:43pm UTC](https://forums.unrealengine.com/t/swarm-cpu-core-thread-limit/303734 "2021-04-28T18:43:16Z")
Dear Epic, dear Community, I wanted to ask if there is a Limit on the amount of CPUs/Cores that Swarm can use? To be more precise: (1) is there a limit on swarm agent clients? (2) Did anyone try a dual socket machine… [Next page](https://forums.unrealengine.com/tag/swarm-agent/4178.md?match_all_tags=true&page=1&tags%5B%5D=swarm-agent)