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Show HN: Sim Studio – Open-Source Agent Workflow GUI

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Re: Show HN: Sim Studio – Open-Source Agent Workflow GUI

#51

Earlier quoted context omitted.

I modified the docker-compose.yml thus: ... services: simstudio: build: context: . dockerfile: Dockerfile ports: - "3000:3000" volumes: - ./sim:/app - /app/node_modules - /app/.next extra_hosts: - "host.docker.internal:host-gateway" environment: - OLLAMA_HOST=http://host.docker.internal:11434 - NODE_ENV=development - DATABASE_URL=postgresql://postgres:postgres@db:5432/simstudio ... Then I ran `docker compose up -d --…

i think it could be one of a few things: - first, even though your ollama is running on the host, you still need to use the local profile flag to enable ollama models in the UI. you can do this by running the docker compose command with `local-cpu` - also, make sure your host ollama is actually running and responding (curl http://localhost:11434/api/tags should show your models) - if neither of the above work, you ma…

I see this in the docker compose logs, but those models don't show up in the model drop-down on the Agent block:

  simstudio-1  | [2025-04-29T03:41:12.195Z] [INFO] [OllamaStore] Updating Ollama models {
  simstudio-1  |   "models": [
  simstudio-1  |     "hf.co/bartowski/Qwen_Qwen3-32B-GGUF:latest",
  simstudio-1  |     "qwen3:30b-a3b-q4_K_M",
  simstudio-1  |     "gemma3:12b-it-qat",
  simstudio-1  |     "gemma3:4b-it-q4_K_M",
  simstudio-1  |     "nomic-embed-text:latest"
  simstudio-1  |   ]
  simstudio-1  | }
  simstudio-1  | [2025-04-29T03:41:12.195Z] [INFO] [ProviderUtils] Updated Ollama provider models {
  simstudio-1  |   "models": [
  simstudio-1  |     "hf.co/bartowski/Qwen_Qwen3-32B-GGUF:latest",
  simstudio-1  |     "qwen3:30b-a3b-q4_K_M",
  simstudio-1  |     "gemma3:12b-it-qat",
  simstudio-1  |     "gemma3:4b-it-q4_K_M",
  simstudio-1  |     "nomic-embed-text:latest"
  simstudio-1  |   ]
  simstudio-1  | }
Whether or not I include `--profile local-cpu` in the docker compose command:

- the models from my local ollama show up in the logs, and

- the models don't show up in the model drop-down in the Agent block.

AFAICT the only impact of `--profile local-cpu` is starting a docker container with ollama running.

Re: Show HN: Sim Studio – Open-Source Agent Workflow GUI

#53

Earlier quoted context omitted.

i think it could be one of a few things: - first, even though your ollama is running on the host, you still need to use the local profile flag to enable ollama models in the UI. you can do this by running the docker compose command with `local-cpu` - also, make sure your host ollama is actually running and responding (curl http://localhost:11434/api/tags should show your models) - if neither of the above work, you ma…

I see this in the docker compose logs, but those models don't show up in the model drop-down on the Agent block: simstudio-1 | [2025-04-29T03:41:12.195Z] [INFO] [OllamaStore] Updating Ollama models { simstudio-1 | "models": [ simstudio-1 | "hf.co/bartowski/Qwen_Qwen3-32B-GGUF:latest", simstudio-1 | "qwen3:30b-a3b-q4_K_M", simstudio-1 | "gemma3:12b-it-qat", simstudio-1 | "gemma3:4b-it-q4_K_M", simstudio-1 | "nomic-emb…

just pushed a hotfix that should resolve this for you! let me know if you are still having issues. we recently updated the csp and needed to explicitly add the ollama endpoint to the connect-src directive

Re: Show HN: Sim Studio – Open-Source Agent Workflow GUI

#55
post #54

What are your main competitors for agent orchestration with observability?

The big names out there are n8n and flowwise. I'd encourage you to try them out and let us know what you think compared to Sim Studio! We have a logs page that shows execution duration, tool call duration, tokens used, the cost based on the model you selected, etc.

Re: Show HN: Sim Studio – Open-Source Agent Workflow GUI

#56
post #54

What are your main competitors for agent orchestration with observability?

The big names out there are n8n and flowwise. I'd encourage you to try them out and let us know what you think compared to Sim Studio! We have a logs page that shows execution duration, tool call duration, tokens used, the cost based on the model you selected, etc.

Thanks. It would be nice to find your expert comparison of Sim Studio to these other tools in your docs. The comparisons you already made in this thread is a great resource too ofc.

Re: Show HN: Sim Studio – Open-Source Agent Workflow GUI

#57

Earlier quoted context omitted.

I see this in the docker compose logs, but those models don't show up in the model drop-down on the Agent block: simstudio-1 | [2025-04-29T03:41:12.195Z] [INFO] [OllamaStore] Updating Ollama models { simstudio-1 | "models": [ simstudio-1 | "hf.co/bartowski/Qwen_Qwen3-32B-GGUF:latest", simstudio-1 | "qwen3:30b-a3b-q4_K_M", simstudio-1 | "gemma3:12b-it-qat", simstudio-1 | "gemma3:4b-it-q4_K_M", simstudio-1 | "nomic-emb…

just pushed a hotfix that should resolve this for you! let me know if you are still having issues. we recently updated the csp and needed to explicitly add the ollama endpoint to the connect-src directive

I updated, deleted docker volumes, and retried, and I still see the same issue :(

Re: Show HN: Sim Studio – Open-Source Agent Workflow GUI

#59

How can I add a custom tool or integration to Sim Studio and have it appear in the workflow builder UI?

If you want to add a custom tool for your agent to use, you can use the “add custom tool” in the agent block and just define the JSON schema and the code for the tool call.

If you want a custom integration, you can either request it, or if you are running locally we have really thorough instructions on how you can add a tool/block in the contributing guide for the repo. You can use this to extend the platform for yourself or add integrations to the main repo. Hope that helps!

Re: Show HN: Sim Studio – Open-Source Agent Workflow GUI

#60

Earlier quoted context omitted.

just pushed a hotfix that should resolve this for you! let me know if you are still having issues. we recently updated the csp and needed to explicitly add the ollama endpoint to the connect-src directive

I updated, deleted docker volumes, and retried, and I still see the same issue :(

tried another fix! let me know if that resolves it for you, otherwise you can join the discord and I can help you debug to the best of my ability. sorry for the hassle
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