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# Sigillion

> Lossless, local, provable memory for AI agents. Today it works in Claude Code and in Cursor: it keeps every Claude Code session and every Cursor chat on the user's own computer, word for word, compressed and sealed in hash-chained segments so that a change shows, after compaction and after Claude Code deletes its transcripts; one store for both agents; a brief at each session's start; recall of any earlier turn, each answer with a receipt. Claude Code and Cursor first, every agent next, then legal and finance. Made by Steddy Nova SRL.

Sigillion is not open source. The packages are on PyPI: sigillion (the engine, compiled), sigillion-capture and sigillion-format (readable source). The latest release is 0.1.2 (4 November 2026). Install, on Windows or Linux x86_64 or on a Mac with Apple silicon (macOS 11 or later), with Python 3.10 to 3.14 and Claude Code 2.1.287 or later or Cursor: `pipx install --include-deps sigillion`, then `sigillion install` (Claude Code) or `sigillion install cursor` (Cursor). Free for personal, non-commercial use, with no trial and no licence key; use for a company needs written permission (info@sigillion.com); export always works. Sigillion itself sends nothing anywhere; what it hands the agent becomes part of the session, which Claude Code sends to Anthropic and Cursor to the models it uses.

## Docs

- [README](https://github.com/Sigillion-AI/sigillion/blob/main/README.md): what it is, the requirements, the install, the terms, the waitlist
- [For agents](https://github.com/Sigillion-AI/sigillion/blob/main/AGENTS.md): the short version for an agent helping a user
- [Privacy note](https://github.com/Sigillion-AI/sigillion/blob/main/PRIVACY.md): what is kept, where and what reaches your agent's model
- [Licence terms](https://github.com/Sigillion-AI/sigillion/blob/main/LICENSE)
- [Security policy](https://github.com/Sigillion-AI/sigillion/blob/main/SECURITY.md)
- [Changelog](https://github.com/Sigillion-AI/sigillion/blob/main/CHANGELOG.md): what each release changed

## Packages

- [sigillion on PyPI](https://pypi.org/project/sigillion/)
- [sigillion-capture on PyPI](https://pypi.org/project/sigillion-capture/)
- [sigillion-format on PyPI](https://pypi.org/project/sigillion-format/)

## Optional

- [Releases](https://github.com/Sigillion-AI/sigillion/releases): each release with its wheels and SHA-256
- [Discussions](https://github.com/Sigillion-AI/sigillion/discussions): questions
- [Join the waitlist](https://github.com/Sigillion-AI/sigillion/issues/new/choose): the first 500 get a founder licence