v0.7.0 — local-first, open source

The time machine for AI systems.

Capture every AI run. Replay any of them. Diff what changed. Trace what depended on what. Export signed evidence. Local-first. Open source. CLI-first.

pip install novafabric

See an example run

This site is documentation. The CLI is the canonical interface — a read-only browser viewer is planned for v1.x.

~/projects/agent

A 90-second story

Yesterday it worked. Today it doesn't. Now what?

01 — yesterday

It worked.

Your code-review agent shipped a thoughtful review on a 200-line PR. Captured automatically — every model call, every tool, every env fact.

nova capture python review.py

02 — today

It fails.

Same PR, different review — shallower, missing the bug yesterday's run flagged. Something upstream changed. The prompt? The model? A tool version?

nova diff RUN_A RUN_B

03 — answer

Replay yesterday's run.

Re-execute it under the new prompt. Lineage shows the prompt changed from @0.1.0 to @0.2.0. Eval suite caught it. Promotion blocked. Production stays on v0.1.0.

nova replay RUN_A --mode mocked

The five primitives

Five primitives that compose into a time machine.

Each one stands alone. Together they capture, replay, and prove what your AI system did — yesterday, last quarter, two years ago.

Asset Registry

Identity layer for every model, agent, prompt, tool, dataset. Eval-gated promotion from development → production.

Explore

Run Capsule

A self-contained record of one AI run. Inputs, outputs, model calls, tools, environment — schema-validated.

Explore

Replay

Reconstruct yesterday's run today. Four modes — exact, mocked, semantic, forensic — with honest guarantees.

Explore

Lineage

Causation graph linking runs, assets, and artifacts. Provenance, blast radius, replay chain — three queries.

Explore

Evidence Bundle

Signed, portable proof of what happened. in-toto DSSE, ed25519 — verifiable in your browser, right now.

Explore

Honest limitations

What we don't promise.

Not byte-exact replay of remote LLMs. If you call OpenAI or Anthropic, NovaFabric replays your run from captured records, not from re-issuing the API call. Four replay modes (exact, mocked, semantic, forensic) make the guarantee explicit per run.

Not a hosted SaaS. v0.x runs entirely on your machine. SQLite for the registry and lineage. Local files for capsules. v0.7 introduces an optional server mode; v1.x adds a local read-only browser. Until then, this site is the only browser experience.

Not an evaluation harness. NovaFabric records what happened so your evals can answer "did the system regress?" Eval suites are a separate primitive (see the registry demo); we don't ship benchmarks.

Try it on your own code.

Three commands. No accounts. No telemetry. Capsules live in .novafabric/runs/ on your machine.

pip install novafabric

nova capture python your_agent.py

nova replay <run-id> --mode mocked

Install instructions · GitHub · Concepts in depth