Caelis
Open-source runtime for long-running AI agent work
Details
- External ID
- 1249024
- Source
- PH
- Company
- —
- Product
- Celmis
- Website domain
- producthunt.com
- Launched
- Sept. 18, 2026
- Cohort
- —
- Upvotes
- 1
- Upvotes percentile
- 0.30815693820825313
- Tags
- Open Source, Developer Tools, Artificial Intelligence, GitHub, OpenAI Day
- Fetched at
- Sept. 19, 2026, 1:14 a.m.
- Updated at
- Sept. 19, 2026, 1:14 a.m.
Description
Caelis is an open-source, terminal-first runtime for long-running AI agent work. Run GPT-6 Astra as the lead agent and bring specialist models and ACP agents into the same local session. Participants exchange messages, use tools, and keep their own conversations. Follow their work in split panes, steer agents directly, and resume durable sessions with built-in memory and approval controls.
Enrichment
- Theme
- AI agent frameworks and developer tools
- Vertical
- Horizontal
- Function
- Dev tools
- Audience
- Developer
- AI stance
- AI-native
- Project type
- Hobby / open-source project
- Normalized one-liner
- open-source runtime for long-running ai agents
- Manually corrected
- False
Could you build this?
Partial A terminal-first runtime running multi-model agent protocols with native OS sandboxing (Seatbelt, Bubblewrap) requires lower-level systems and security engineering.
What it would actually take: The architecture requires a CLI daemon (written in Go, Rust, or Node) interfacing with low-level OS isolation primitives: macOS Seatbelt (sandbox-exec/libsandbox) and Linux Bubblewrap (namespaces, seccomp filters), paired with a multi-pane terminal emulator (like tmux integration or Ink/bubbletea). The hard part is managing cross-agent protocol message routing, secure subprocess sandboxing across multiple OS platforms, and lifecycle state persistence in an open-source terminal runtime.
Competitors
Other products that read as similar to this one — 256 launches clear the similarity bar, closest 8 shown.
Attention rank: #161 of 257 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 316 days after the earliest competitor.
- Cognis · ph · 2026-09-12 · 2 upvotes · similarity 0.44
- Running AI agents across environments needs a proper solution · hn · 2026-03-24 · 8 upvotes · similarity 0.43
- Agentic Orchestrator, a TUI for long-running coding agents · hn · 2026-06-30 · 20 upvotes · similarity 0.43
- Agyn, an open-source Kubernetes runtime for AI agents · hn · 2026-05-20 · 9 upvotes · similarity 0.42
- Cadesia · ph · 2026-09-28 · 1 upvotes · similarity 0.42
- Kastra · ph · 2026-07-22 · 334 upvotes · similarity 0.40
- Open Agents · ph · 2026-04-14 · 161 upvotes · similarity 0.40
- Kestrel - AI Agents for Platform Engineering · yc · 2026-07-01 · 20 upvotes · similarity 0.40
Other launches for this product
Same idea, different domain
Nobody's really built a dev tools tool for Sales yet.