Asterism: A Local-First Knowledge Graph That Grows From Your Claude Chat History

Bidit Das — Tue, 14 Jul 2026 00:46:54 +0000

Every LLM conversation disappears the moment you close the tab. Ask something today, revisit the same idea next week, and it has no memory of ever having thought about it with you. Each thread is an island.

I wanted something different: conversations that accumulate into an actual picture of what I care about, not a transcript archive, but something closer to how memory itself works.

That's what led to Asterism.

What it does

Asterism parses your exported Claude conversation history and builds a local knowledge graph. It extracts (entity, relationship, entity) triples, and every time a concept resurfaces in a later conversation, the connection to it strengthens. Stop engaging with an idea, and it fades, eventually dropping off the graph entirely.

The result renders as an interactive constellation. Concepts you return to often glow brighter and sit more centrally. Concepts you've moved on from dim and drift into the dark.

How it works

Hebbian learning — edges strengthen each time the LLM traverses them (weight += 0.2 per traversal). Concepts left unrevisited for 3 hours of session time decay and vanish.
You are the central node — your own node sits at the center of the graph at full brightness, always. It never decays.
Local SQLite storage — the entire graph lives in ~/.asterism/asterism.db. No cloud, no sync, no accounts.
LLM context injection — relevant nodes and edges get injected into the Claude prompt automatically, so the model has implicit awareness of your past thinking.
Triple extraction — a fast extraction model (local Ollama or Anthropic Haiku) pulls structured relationships out of each exchange.

Built local-first, on purpose

The only external calls are to the Anthropic API for chat responses and, optionally, Haiku for extraction. Extraction can also run fully offline via Ollama. No telemetry, no accounts, delete ~/.asterism/ for a clean slate.

Stack

Layer	Tech
Storage	SQLite
Graph	NetworkX
Visualization	Vanilla JS force simulation
LLM	Anthropic SDK
Extraction	Ollama `llama3.2:3b` or Anthropic Haiku
UI	Streamlit
CLI	Click

Where it's headed

This is v0.1.0, early and rough. Here's the direction:

Beyond Claude — a memory layer that works across whichever frontier LLM you're using, not locked to one provider.
Zero-friction install — no API keys, no local Python setup, cached in-browser.
Simpler onboarding — fewer steps between finding it and running it.

If you've worked on local-first tools, LLM memory/context systems, or graph-based retrieval, I'd genuinely value your take on what to prioritize next.