Basalt, #1 AI observability tool for teams, is launching its brand new Agent Builder : prototype, test, and deploy complex AI flows composed of multiple prompts, and run them through a dataset of scenarios.
Thanks Nicolas for the hunt !
I’m François, co-founder of Basalt, and together with the team we’re super excited to share our brand new feature: the Agent Builder 🚀
What pain are we solving ?
We're experts in AI observability, and along the way we noticed something important: engineers and PMs want to prototype AI agents before shipping them, but workflow builders are not made for evaluations.
What’s new with our Agent Builder
Basalt's Agent Builder is the easiest way to design, test, and optimize complex AI flows built from sequences of prompts and actions.
👉 Create and customise your own flows
👉 Chain prompts and actions with ease
👉 Run each prompt on the best-suited model
👉 Set custom evaluation criteria for each step
👉 Measure performance on hundred of real case scenarios with dedicated datasets
Stop testing prompts in isolation. Turn your flow into a single, end-to-end workflow you can evaluate thoroughly, and then deploy with confidence.
Hope you enjoy it !
❤️ from the Basalt team
Congrats on the launch! Curious if there's any example workflow with multimodal (video, speech) results?
Great launch! How does Basalt prevent overfitting on the evaluation dataset — e.g. if prompts start optimizing too much to test cases and lose generality?
This looks amazing, François! 👀 How does the evaluation part work across different models?
Guys ! so happy to have you back on Product Hunt, the platform has powered up so much congrats !
Friends don’t let friends building AI apps without proper logging, and evaluation.
Basalt is the go to tool, easy to install, simple to setup.
Great to see the improvements from v1
Basalt is back on Product Hunt, 6 months after an epic fight!! Let's go, love the product!!
Love the energy on the video @guillaume_marquis3 ! At Hexa we are already addicted to your agent builder ! Can't wait to see what's coming next !
Good to be back on Product Hunt! 🚀
I’m Guillaume, co-founder of Basalt, and today we’re introducing a major step forward in how teams build with AI: the Basalt Agent 🎉
Until now, prototyping agents meant juggling between workflow tools, prompt sandboxes, and spreadsheets, but none of them were really made for evaluation.
That’s the gap we’re closing.
With Agent Builder, you can:
🔗 Chain prompts and actions effortlessly
🤓 Assign each step to the best model for the job
📐 Define your own evaluation metrics
📊 Run large-scale tests on real-world scenarios
From your first chained prompt, to complex multi-turn agentic workflows, Basalt gives you a single place to design, test, and optimize, before you ever ship.
This one’s for everyone who’s ever said, “I just want to see how it performs in context.”
Now you can.
Thank again to @picsoung for the hunt! I hope you’ll enjoy using it as much as we enjoyed building it 💛
— The Basalt team
About Basalt Agents on Product Hunt
“Evaluate AI workflows and reach 99% AI quality.”
Basalt Agents launched on Product Hunt on October 16th, 2025 and earned 244 upvotes and 27 comments, placing #7 on the daily leaderboard. Basalt, #1 AI observability tool for teams, is launching its brand new Agent Builder : prototype, test, and deploy complex AI flows composed of multiple prompts, and run them through a dataset of scenarios.
Basalt Agents was featured in Productivity (649.7k followers), Software Engineering (42.3k followers) and Artificial Intelligence (466.2k followers) on Product Hunt. Together, these topics include over 219.6k products, making this a competitive space to launch in.
Who hunted Basalt Agents?
Basalt Agents was hunted by Nicolas Grenié. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Want to see how Basalt Agents stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
Nicolas Grenié