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SteelSpine
Local-first replay tool for debugging AI agents
Wrap any AI agent in one command. Capture every event, compare runs, replay from any state. Zero code changes. Cryptographically signed end-to-end — EU AI Act Article 12 ready out of the box.
Hi Product Hunt 👋
I'm Jeremy, solo founder. Built SteelSpine because my AI agent failed in production. I had logs. I still didn't know why.
What it does: wrap any agent command (zero code changes) and capture every event into a hash-chained, Ed25519-signed audit trail. From that capture you can:
🔁 Replay step-by-step from any captured state
🔀 Compare two runs (line-by-line divergence highlighted)
🌳 Branch alternative futures from any event
🔐 Verify the chain wasn't tampered with
Works with LangChain, LlamaIndex, MCP, raw Python, custom harnesses, anything you can wrap in a shell command.
The captured chain doubles as EU AI Act Article 12-ready audit trails (Aug 2, 2026 enforcement) but the daily-use value is the debug loop.
Local-first by design. Nothing leaves your machine. Works with any agent harness (LangChain, LlamaIndex, MCP, raw Python) and whichever model your agent calls. SteelSpine wraps your agent's process, not the API. The model is whatever your code talks to.
CA$29.99/mo, 14-day free trial. Just me building this.
Demo: https://asciinema.org/a/Ah79vmcO...
Site: https://steelspine.ai
HF technical writeup: https://huggingface.co/blog/Spec...
PH discount: code PRODUCTHUNT for 25% off first 3 months.
Happy to answer questions. Genuinely curious what PH builders use for debugging their AI agents today.
About SteelSpine on Product Hunt
“Local-first replay tool for debugging AI agents”
SteelSpine was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #103 on the daily leaderboard. Wrap any AI agent in one command. Capture every event, compare runs, replay from any state. Zero code changes. Cryptographically signed end-to-end — EU AI Act Article 12 ready out of the box.
On the analytics side, SteelSpine competes within SaaS, Developer Tools and Artificial Intelligence — topics that collectively have 1M followers on Product Hunt. The dashboard above tracks how SteelSpine performed against the three products that launched closest to it on the same day.
Who hunted SteelSpine?
SteelSpine was hunted by SteelSpine AI. 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.
For a complete overview of SteelSpine including community comment highlights and product details, visit the product overview.
SteelSpine AI