# IsoKron

> IsoKron (isokron.ai) is the home of four open-source, local-first tools for coding agents — kronicle-lite, sea-lite, cc-anchor and mcp-catalog-snap — and of the IsoKron platform, a multi-agent, multi-tenant layer growing out of the same ideas. The tools are free and Apache-2.0. The platform is in development and not self-serve. A hosted service, Anchor (anchor.isokron.ai), countersigns kronicle-lite checkpoints on a free tier.

Author: Joshua Bryan (GitHub: rafe-walker). Legal entity: Stormhaven Enterprises LLC. Contact: hello@isokron.ai.

## kronicle-lite 0.2.0 (MCP server; npm; MCP Registry io.github.rafe-walker/kronicle-lite)

A SQLite-backed document store where every write is an event on a SHA-256 hash chain (RFC 8785 canonical JSON, public genesis sha256("kronicle-lite-genesis-v1")), blocks are content-addressed by BLAKE3-256, every recall() hit carries an Ed25519 receipt bound to the chain head, and get_system_state gives the agent an orient call: pass the last cursor, get the delta since, a drift banner when away too long, and a retraction list of superseded or tombstoned blocks. Checkpoints are Ed25519-signed Merkle roots over a seq range. The signing key is local: tamper-evidence against accidents and unprivileged edits, not notarization.

Install (Claude Code plugin, server + orient skill):
  claude plugin marketplace add rafe-walker/isokron-plugins
  /plugin install kronicle-lite@isokron-plugins
Install (server only, Claude Code or Cowork):
  claude mcp add kronicle-lite -- npx -y kronicle-lite serve
Cursor / Claude Desktop (.cursor/mcp.json, claude_desktop_config.json):
  { "mcpServers": { "kronicle-lite": { "command": "npx", "args": ["-y", "kronicle-lite", "serve"] } } }
GitHub Copilot (.vscode/mcp.json): { "servers": { "kronicle-lite": { "type": "stdio", "command": "npx", "args": ["-y", "kronicle-lite", "serve"] } } }
Codex (~/.codex/config.toml): [mcp_servers.kronicle-lite] command = "npx" args = ["-y", "kronicle-lite", "serve"]

- Repository: https://github.com/rafe-walker/kronicle-lite
- npm: https://www.npmjs.com/package/kronicle-lite
- README: https://github.com/rafe-walker/kronicle-lite#readme
- Data format (every hash and signature, worked examples): https://github.com/rafe-walker/kronicle-lite/blob/main/docs/FORMAT.md
- Threat model: https://github.com/rafe-walker/kronicle-lite/blob/main/docs/THREAT-MODEL.md
- Orient skill for Claude Code: https://github.com/rafe-walker/kronicle-lite/blob/main/skills/orient/SKILL.md
- Roadmap: https://github.com/rafe-walker/kronicle-lite/blob/main/ROADMAP.md

Tools: get_system_state, audit_assumptions, recall, verify, verify_chain, checkpoint_chain, put_document, supersede_block, tombstone_block. Resource: kronicle://docs/{slug}.

## sea-lite 0.1.1 (MCP server; npm; MCP Registry io.github.rafe-walker/sea-lite)

A fenced work queue for parallel coding agents. sea_next atomically picks and claims the best eligible ticket and returns a one-time claim token; every write must present it. Claims are leases (<= 600 s) with lazy expiry. Typed links (depends_on, blocks, parent_of, ...) keep the precedence graph acyclic; sea_apply lays down up to 50 tickets and 100 links in one all-or-nothing write. Every change is an event on the kronicle-lite chain in the same SQLite file.

Install: claude mcp add sea-lite -- npx -y sea-lite serve   (or /plugin install sea-lite@isokron-plugins)
- Repository: https://github.com/rafe-walker/sea-lite
- npm: https://www.npmjs.com/package/sea-lite

## cc-anchor 0.1.0 (Claude Code plugin; GitHub only)

A <= 25-line anchor card (project, goal, invariants, last five tool-call breadcrumbs, kronicle-lite cursor) written on PreCompact and re-injected verbatim at the top of the fresh context on SessionStart(compact), with a reconciliation discipline (treat the summary as as-of before compaction; mark stale claims RETRACTED). Status line shows goal, tool calls since compaction and drift. Works without kronicle-lite; carries the orient cursor across compaction when present.

Install: claude plugin marketplace add rafe-walker/cc-anchor && claude plugin install cc-anchor@cc-anchor
- Repository: https://github.com/rafe-walker/cc-anchor

## mcp-catalog-snap 0.1.0 (CLI + GitHub Action; npm)

Snapshot an MCP server's tools/list, prompts/list and resources/templates/list as RFC 8785 canonical JSON with a sha256 fingerprint; re-capture and fail CI (exit 1) on any byte of drift, with JSON-Pointer paths. Catalog drift silently invalidates prompt-cache prefixes and changes agent behavior.

Usage: npx mcp-catalog-snap snapshot -- npx -y kronicle-lite serve ; npx mcp-catalog-snap check -- npx -y kronicle-lite serve
- Repository: https://github.com/rafe-walker/mcp-catalog-snap
- npm: https://www.npmjs.com/package/mcp-catalog-snap

## isokron-plugins (Claude Code plugin marketplace)

claude plugin marketplace add rafe-walker/isokron-plugins ; then /plugin install kronicle-lite@isokron-plugins or sea-lite@isokron-plugins. Each plugin pins one npm server version and bundles its skill.
- Repository: https://github.com/rafe-walker/isokron-plugins

## Anchor (hosted, planned, not available)

Hosted checkpoint verification: kronicle-lite checkpoint --push sends the signed Merkle root, range and public key (never the events); Anchor countersigns and returns a receipt; a public page and verify --remote check it. Live since 2026-11-01 on a free tier (1 key, 1,000 anchors/month, 30-day retention; free key via a $0 Polar checkout). Not yet running: nightly day roots published to a public git repository, OpenTimestamps (Bitcoin) and Sigstore Rekor (receipts show pending until then). A per-seat Team plan comes later. Proves that a root existed by time T and has not changed since; does not prove the root covers real events or who holds the key. Details: https://isokron.ai/pricing

## IsoKron platform (in development, closed)

Typed graph of seventeen entity kinds with database-enforced keys; per-tenant hash chains; claim fencing so parallel agents do not collide on work; a compile pipeline from intent (documents, recordings, sketches) to the typed graph with a human review gate; HNAO hardware reach via PiKVM (alpha). Not available to outside users. Early-access interest: hello@isokron.ai.

## Pages

- https://isokron.ai/ — overview, install for Claude Code / Cursor / Copilot / Codex, recorded demo, tools, comparison with memory servers
- https://isokron.ai/architecture — what kronicle-lite does today (BLAKE3-256 blocks, SHA-256 chain) and what IsoKron adds
- https://isokron.ai/docs — quickstart, client configs and tool table, pointing at the repository
- https://isokron.ai/pricing — free local tools; Anchor hosted verification (coming, not available)
- https://isokron.ai/changelog — releases across all tools, newest first
- https://isokron.ai/notes — long-form notes, newest first (RSS: https://isokron.ai/notes/rss.xml)
- https://isokron.ai/about — who builds this and why
- https://isokron.ai/privacy — no accounts, no analytics
- https://isokron.ai/terms

## Notes

- [Shipping a production MCP server on the 2026-07-28 spec: auth, rate limits, and observability](https://isokron.ai/notes/production-mcp-server) (2026-10-31, Joshua Bryan; drafted with Claude from his notes and code, listings type-checked and smoke-tested in https://github.com/rafe-walker/mcp-production-notes). OAuth 2.1 resource-server auth with RFC 9728 metadata and RFC 8707 audience checks, per-tool scope challenges, tool annotations and cache hints, per-user rate limits keyed on client id plus subject, timeouts and bounded output, OpenTelemetry trace continuation from params._meta, against the v2 TypeScript SDK.

## Founder

Joshua Bryan, former Ring / Amazon support engineer (ten years), building off-grid in Cochise County, Arizona. Story: https://theexiledentrepreneur.com