# Alpibru > Alpibru builds open-source infrastructure for AI agent ecosystems: a universal manifest format for agents, an autonomous sprint orchestrator, a verified composition engine, and an agent-friendly CLI standard. EUPL-1.2 licensed, vendor-neutral, EU-built. Alpibru ships four independent open-source tools designed to work together when you need them to. Each solves a complete problem on its own. ## Open-source projects - [AgentSpec](https://github.com/alpibrusl/agentspec): Universal agent manifest standard. A `.agent` file describes an AI agent (model preferences, skills, tools, trust scopes, behavior traits) and a resolver figures out which runtime (Claude, Gemini, Codex, Aider, opencode, Ollama) to use from the local environment. Agents accumulate cryptographically signed portfolios across sprints. Distributed as `agentspec-alpibru` on PyPI. EUPL-1.2. - [Caloron-Noether](https://github.com/alpibrusl/caloron-noether): Autonomous sprint orchestrator. Give it a goal — it plans tasks, assigns agents, opens real pull requests, runs tests, merges, and learns from each sprint to perform better in the next. Real Git history, real tests passing. Distributed as `caloron-alpibru` on PyPI. EUPL-1.2. - [Noether](https://github.com/alpibrusl/noether): Verified composition platform. Decompose computations into immutable, content-addressed stages that are type-checked before execution. Compiles to standalone binaries or browser WebAssembly. Used by AgentSpec and Caloron-Noether for components that benefit from verifiable composition; useful standalone for any auditable data pipeline. Binaries on GitHub Releases. EUPL-1.2. - [ACLI](https://github.com/alpibrusl/acli): Agent-friendly CLI standard. Specifies how command-line tools should expose themselves so AI agents can discover and use them at runtime — without pre-loaded schemas, external registries, or hand-written documentation. Structured help, machine-readable command trees, semantic exit codes, JSON envelopes. SDKs in Python (`acli-spec`), Rust, TypeScript, Go, Java, .NET, R. EUPL-1.2. ## Documentation - [AgentSpec docs](https://alpibrusl.github.io/agentspec/): Format reference, resolver, inheritance, profiles, signing, registry usage, multi-runtime guides, ecosystem overview. - [Caloron-Noether docs](https://alpibrusl.github.io/caloron-noether/): Sprint loop architecture, CLI reference, Noether backend, cast recordings, comparison with other orchestrators. - [Noether docs](https://alpibrusl.github.io/noether/): Composition engine, stage store, CLI reference, architecture, examples, case studies. - [ACLI docs](https://alpibrusl.github.io/acli/): Specification, SDKs (Python/Rust/TS/Go/...), examples, conformance tests. ## Public registry - The public agent + stage registry lives at (HTTPS, HTTP/2, HTTP/3). Free tier, no authentication required during beta. Use `--registry https://registry.alpibru.com` with the `agentspec` or `noether` CLIs. Also reachable at `noether.alpibru.com` (legacy alias, both URLs hit the same backend). ## Commercial - Noether-Cloud: Hosted registry and infrastructure platform powering the public agent + stage registry above. HTTP registry server (Rust + Postgres), semantic search, curated stage catalog. The same infrastructure can be self-hosted or deployed in your VPC for private agent ecosystems. Enterprise features (SSO, audit logs, multi-tenant isolation, managed Kubernetes) are on the roadmap. Not open-source. Contact via the website. ## How the projects relate ACLI is the foundation: every CLI we ship is ACLI-compliant, so AI agents can discover and use them via `introspect`. Noether is the verified-computation layer: AgentSpec and Caloron-Noether use it internally for parts that benefit from content-addressing and type-safety. AgentSpec defines what an agent IS (manifest + portfolio). Caloron-Noether is what an agent DOES (sprint orchestration). Each tool is independent — you can adopt one, several, or all four. ## Common installs - `pip install agentspec-alpibru` — universal agent manifest format + CLI - `pip install caloron-alpibru` — autonomous sprint orchestrator - Noether: download a binary from for your platform - `pip install acli-spec` — Python SDK for the ACLI standard All packages are MIT-compatible via EUPL-1.2's compatibility matrix. ## License All four open-source projects are licensed under [EUPL-1.2](https://eupl.eu/) — the European Union Public Licence. Compatible with GPL-2.0/3.0, AGPL-3.0, OSL-2.1/3.0, EPL-1.0, CECILL-2.0/2.1, LiLiQ-R/R+, and bidirectionally compatible with most permissive licenses through the EUPL appendix. ## Contact - GitHub organization: - Website contact form: