# Coldrune > Open-source secret management tool. Single binary, embedded SQLite, AES-256-GCM encryption, multi-tenant, passwordless auth. CLI + REST API + MCP server for AI agents. Self-hosted alternative to HashiCorp Vault. ## Guides - [Quickstart](https://docs.coldrune.com/guides/quickstart/): Download, configure, and store your first secret - [Authentication](https://docs.coldrune.com/guides/authentication/): Magic link login, sessions, API key auth - [Organizations](https://docs.coldrune.com/guides/organizations/): Create orgs, invite members, manage roles - [Secrets](https://docs.coldrune.com/guides/secrets/): Set, get, list, delete, import, export, and inject secrets - [Access Control](https://docs.coldrune.com/guides/access-control/): Deny-by-default ACL with glob patterns - [Service Accounts](https://docs.coldrune.com/guides/service-accounts/): API keys for CI/CD and automation - [Configuration](https://docs.coldrune.com/guides/configuration/): coldrune.yml and environment variables ## AI Agents - [MCP Server](https://docs.coldrune.com/agents/mcp-server/): Install and configure the Coldrune MCP server - [MCP Tools Reference](https://docs.coldrune.com/agents/mcp-tools/): All 15 MCP tools with parameters - [llms.txt & AGENTS.md](https://docs.coldrune.com/agents/llms-txt/): Machine-readable docs and project templates ## Reference - [REST API](https://docs.coldrune.com/reference/api/): Complete HTTP API reference with all endpoints, request bodies, and responses ## Self-Hosting - [Server Configuration](https://docs.coldrune.com/self-hosting/configuration/): Full environment variable reference - [Deployment](https://docs.coldrune.com/self-hosting/deployment/): systemd, nginx, and Caddy setup - [Encryption](https://docs.coldrune.com/self-hosting/encryption/): Key hierarchy and rotation - [Backups](https://docs.coldrune.com/self-hosting/backups/): Encrypted S3 backups and restore - [Architecture](https://docs.coldrune.com/self-hosting/architecture/): Data model and system components ## Optional - [Projects & Environments](https://docs.coldrune.com/guides/projects/): Organize secrets into projects and environments - [Audit Logs](https://docs.coldrune.com/guides/audit-logs/): Query the audit trail - [Installation](https://docs.coldrune.com/self-hosting/installation/): Download and install the binary