CTXone

Context anxiety: the daily dread of re-explaining the same project to your AI tools every morning. A context window is working memory — it ends when the session does.

CTXone is a self-hosted context engine that treats a fact as a commit. Every MCP-compatible tool you connect reads and writes the same graph, so what you teach one tool on Monday is known to a different tool on Tuesday.

• remember — store facts, decisions and reasoning with importance weighting
• recall — token-budgeted semantic retrieval that reports its savings ratio
• prime — load markdown files as structured, idempotent memory
• Plans and tasks with a state machine, proofs, blockers and agent assignment
• Branches — explore a direction with its own memory, then diff and merge
• Taint — mark a fact wrong and everything derived from it is flagged
• Provenance — ctx blame answers who told the model that
• Lens web UI — dashboard, plans, sessions, memory tree, branches, diff

90+ MCP tools · REST API · Lens UI · SQLite or Postgres · zero telemetry

• AgentStateDeveloper — team memory alongside code context

Source-available under BSL-1.1, converting to Apache 2.0 18 months after each version's first publication. Internal use — including in production — is unrestricted.