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Time and timezone conversion capabilities for AI assistants.

Create crafted UI components inspired by the best 21st.dev design engineers.

The Notion MCP Server is the official integration from Notion that connects AI assistants directly to your Notion workspace via the Notion REST API. With 4,580+ GitHub stars, it is the canonical MCP tool for bringing Notion's knowledge management capabilities into Claude Desktop, Cursor, Windsurf, and any MCP-compatible client. The server exposes a rich set of tools: search your entire workspace by keyword and return matching pages and databases; retrieve full page content and block trees; create new pages inside any parent page or workspace section; update, append, or delete block content on existing pages; list all databases your integration has access to; query database entries with filter and sort parameters; retrieve individual blocks or nested children by block ID; and add comments to pages. Authentication uses a Notion integration token — create an internal integration at notion.so/my-integrations, share specific pages or databases with it, and set NOTION_TOKEN in your environment (the older OPENAPI_MCP_HEADERS form still works). Install with a single npx command. The Notion MCP Server is especially powerful for AI workflows that span documentation retrieval, project planning, and knowledge capture — Claude can read product specs from Notion, draft new pages from conversation output, log structured data into databases, and search across thousands of notes without any manual copy-paste.

The Linear MCP server connects your AI assistant directly to Linear's project management platform via an officially hosted remote endpoint at mcp.linear.app — no local installation required. This is Linear's own first-party server, authenticated with OAuth 2.1 and centrally managed so you always run the latest version without updates. Available tools let you search issues by keyword, team, cycle, or filter; create new issues with title, description, and assignee; update status, priority, labels, and comments; and navigate Linear's project and cycle structure. In Claude Code, add it with: `claude mcp add --transport http linear-server https://mcp.linear.app/mcp`, then run /mcp to complete the OAuth flow. For older clients, use the mcp-remote bridge for backwards compatibility. Claude Desktop and Claude.ai users can connect via Settings > Connectors. Cursor and Codex have native support via their MCP config. Linear is used by thousands of engineering and product teams to plan, track, and ship software — the Linear MCP server brings that data into every AI-powered workflow without copy-paste or context-switching.

The Slack MCP server (built by Ivan Korotovsky) connects AI assistants like Claude, Cursor, and Windsurf directly to Slack workspaces, enabling conversational access to your team communication channels without requiring workspace admin approval for a bot install. Its standout feature is a "no permission" stealth mode — it authenticates using your own personal Slack session tokens (xoxc/xoxd, or a stored browser session) rather than requiring a Slack App with OAuth scopes, so it works even in locked-down workspaces where you cannot create bots. It also supports full OAuth Bot Token auth and Enterprise/GovSlack deployments for teams that prefer a conventional app install. Tools exposed include reading channel and DM/group-DM history with smart pagination, searching messages across the workspace, posting messages and thread replies, listing channels and users, and adding reactions. Common use cases include automating standups by posting summaries directly to team channels, searching past Slack conversations to surface decisions or context, monitoring specific channels for keywords or alerts, and drafting replies to thread discussions — all from natural-language prompts. Supports both Stdio and SSE transports plus proxy configuration for corporate networks. Install with: `npx slack-mcp-server@latest --transport stdio`. A separate official-style integration exists from Zencoder (@zencoderai/slack-mcp-server) for teams that prefer standard Bot Token OAuth over session-token auth. Compatible with Claude Desktop, Cursor, VS Code, Windsurf, and Cline.

The HubSpot MCP Server is HubSpot's hosted, official Model Context Protocol endpoint for Smart CRM data, reachable at https://mcp.hubspot.com and authorised with OAuth 2.0 — there is no package to install and no token to paste into a config file. Access is scoped by a HubSpot user-level app: you create one with read (and optionally write) scopes for the CRM objects you want an assistant to reach, then complete the OAuth flow from inside your client. Read and write coverage spans contacts, companies, deals, tickets, carts, products, orders, line items, invoices, quotes, subscriptions and lists, plus engagements — calls, emails, meetings, notes and tasks — and the associations between them. Organisational context (users, teams, reporting structures, owners, roles, seats) and marketing content (campaigns and their metrics, landing pages, website pages, blog posts) are read-only. Custom Sensitive Data Properties and Personal Health Information are excluded regardless of scopes. Two other things share the name and are commonly confused with this one: the Developer MCP server, installed locally with `hs mcp setup` from the HubSpot CLI and aimed at building HubSpot apps rather than querying CRM records, which requires Developer Platform v2025.2; and the original May 2025 public beta, an npm package configured with a private-app access token, which is what most third-party setup guides still describe. The server remains in beta and HubSpot advises experimenting in a developer sandbox and reviewing every write confirmation, since an LLM will occasionally propose a change to a system of record that it should not.