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DimensionButterbaseAI-native, open-source backend-as-a-service with Postgres, auth, storage, functions, AI gateway, and MCP server.Microsoft 365 MCP ServerAn MCP server for interacting with Microsoft 365 and Office services through the Graph API.
FMRS55 / 100 · C61 / 100 · C
Reliability7 / 208 / 20
Security and permissions11 / 2013 / 20
Maintenance15 / 2010 / 20
Documentation13 / 2016 / 20
Setup experience9 / 2014 / 20
Best for
  • Developers building AI-native applications
  • Teams needing a self-hosted BaaS
  • Projects wanting to expose backend capabilities to AI agents
  • Developers who want to integrate Microsoft 365 data into AI assistants or custom applications.
  • Scenarios requiring unified access across multiple services (email, calendar, files, Teams, etc.).
  • Lightweight solutions to interact with Graph API via MCP protocol.
Not for
  • Non-technical users requiring fully managed services
  • Enterprises with high demands for stability and production support
  • Scenarios with simple backend needs that only require a single feature
  • Highly secure enterprise production environments (requires careful scope management and deployment complexity).
  • Admin tasks requiring Microsoft 365 admin permissions (like security alerts, audit logs) — consider companion project ms-365-admin-mcp-server.
  • Environments without Node.js.
  • Support for non-Microsoft clouds like GCC High (only Global and China 21Vianet currently).
Required permissions
  • Requires a Butterbase API key (bb_sk_...) for API access
  • If self-hosting, requires Docker and Node.js 22+
  • May need to configure infrastructure such as Postgres, Redis, S3/R2
  • Requires Microsoft Graph API permissions, dynamically requested based on enabled tools. Examples: User.Read, Mail.Read, Files.Read.
  • Organization mode (--org-mode) requires additional Graph permissions for Teams, SharePoint, etc. (e.g., Sites.Read.All).
  • Shared mailbox access requires delegated Mail.Read.Shared or Mail.Send.Shared scopes.
  • Use --allowed-scopes to restrict tool exposure; --extra-scopes to add extra scopes. Note: --allowed-scopes only narrows, never expands permissions.
Risks and side effects
  • The open-source version is young (v0.2.0) and may have unnoticed bugs
  • Some features (e.g., multi-region orchestration, billing) are only in the managed private repo; self-hosted version is limited
  • The AI gateway lacks upstream router adapters, requiring custom implementations
  • Token security: File-based token storage may be exposed; use OS credential storage or secure custom paths.
  • Overly broad permissions: default requests all scopes implied by tools; use allowed-scopes or tool filtering to limit.
  • Multi-tenant token risk: With default 'common' tenant, personal account refresh tokens may be rejected as of June 2026, causing session expiry.
  • Third-party project risk: Not officially maintained, potentially less stable than official solutions.
  • HTTP mode OAuth setup complexity: Requires correct Azure AD app registration and redirect URIs.
Supported clientsClaude DesktopClaude Desktop, Open WebUI
Tools010