🗣️ Post 1: Launch HN: Rowboat (YC S24) – Open-source IDE for multi-agent systems

As posted by: segmenta  |  🔥 Points: 58

https://github.com/rowboatlabs/rowboat

💬 Summary

Hi HN! We are Arjun, Ramnique, and Akhilesh, the founders of Rowboat (https://www.rowboatlabs.com), an AI-assisted IDE for building and managing multi-agent systems with a copilot. Using Rowboat, you can build both deterministic automation agents (e.g. automatically summarizing emails) and more agentic systems (e.g. a meeting prep assistant or a customer support bot).

Here are some examples:

- Meeting-prep assistant: https://www.youtube.com/watch?v=KZTP4xZM2DY

- Customer support assistant: https://www.youtube.com/watch?v=Xfo-OfgOl8w

- Gmail and Reddit assistant: https://www.youtube.com/watch?v=6r7P4Vlcn2g

Rowboat is open-source (https://github.com/rowboatlabs/rowboat) and has a growing community. We first launched it on Show HN a few months ago (https://news.ycombinator.com/item?id=43763967).

Today we are launching a major update along with a cloud offering. We’ve added built-in tool integrations for 100s of tools like Gmail, Github and Slack, RAG with documents and URLs, and triggers to invoke your assistant based on external events.

Our cloud version includes all the features of the open-source IDE, but runs instantly with no setup or API keys. For launch, we're offering $10 free usage with Gemini models so you can start building right away for free without adding any card details. Paid plans start at $20/month and give you access to additional models (OpenAI, Anthropic, Gemini, with more coming) and higher usage limits.

There’s a growing view that some tasks are better handled by single agents (https://news.ycombinator.com/item?id=45096962), while others benefit from multi-agent systems for higher accuracy ( https://www.anthropic.com/engineering/multi-agent-research-s...). The difference often comes down to scope: a focused task like coding suits a single agent, but juggling multiple domains such as email, Slack, and LinkedIn is better split across agents. Multi-agent systems also help avoid context pollution, since LLMs lose focus when asked to handle unrelated tasks. In addition, cleanly dividing responsibilities makes each agent easier to test, debug, and improve.

However, splitting work into multiple agents and getting their prompts right is challenging. OpenAI and others have published patterns that work well for different scenarios (https://cdn.openai.com/business-guides-and-resources/a-pract...). We’ve added agent abstractions, built on top of OpenAI’s Agents SDK, to support these patterns. These include user-facing agents that can decide to hand off to another agent when needed; task agents that perform internal tasks; and pipelines that deterministically call a sequence of agents.

Rowboat’s copilot (‘Skipper’) is aware of these patterns and has been seeded with tested patterns, such as a manager‑worker setup for a customer support bot, a pipeline for automated document summarization, and multi‑agent workflows for combining web search with RAG. It can:

- Build multi-agent systems from a high-level request and decide how work must be delegated across agents

- Edit agent instructions to make correct tool calls using Composio tools or any connected MCP server

- Observe your playground chat and improve agents based on your tests

We see agentic systems as a spectrum. On one end are deterministic workflows with a few LLM calls. On the other end are fully agentic systems where the LLM makes all control flow decisions - we focus on this end of the spectrum, while still allowing deterministic control where necessary for real-world assistant use cases. We intentionally avoided flowchart-style editors (like n8n) because they become unwieldy when building and maintaining highly agentic systems.

We look forward to hearing your thoughts!

🗣️ Post 2: Show HN: I built a tool to visually manage my LLM prompt templates and save them

As posted by: ml4den  |  🔥 Points: 3

https://promptcanvas.ml4den.com/

💬 Summary

This is Prompt Canvas - a simple, open-source web app that lets you visually build LLM prompt templates as YAML schemas and then generate complete prompts by populating values in the templates. It’s based on a single HTML file with no real privacy concerns and everything is portable thanks to YAML exports.

Check out the example in the dropdown and read the guide to see how it works: https://promptcanvas.ml4den.com/

LLMs like structure and I found that generating prompts like this is an easy way of giving it to them. It can be useful if you’re doing a degree of prompt engineering and you want to test small variations in your prompts; or if you have a use case where you submit the same promps many times but with some input variations. I found that browsing to a YAML file and tweaking one parameter for a particular job is much cleaner than a web of Notion pages which is what I had before.

Some thought and iteration has gone into the templating engine but everything is still early stage! Some of it is opinionated, and some of it is meant to be quite extensible to different use cases. Let me know if it makes sense.

I built this mostly with Gemini 2.5 Pro out of my own necessity. Would love to know if it's useful for you! Feedback welcome; as are bugs and things on GitHub: https://github.com/ml4den/PromptCanvas

🎯 Final Takeaways

These discussions reveal how developers think about emerging AI trends, tool usage, and practical innovation. Take inspiration from these community insights to level up your own development or prompt workflows.