MCP Time Server vs Slack MCP Server

A side-by-side look at pricing, capabilities, pros, cons, and our editorial scores.

	MCP Time Server MCP Servers	Slack MCP Server MCP Servers
Tagline	Official MCP reference server for current time and IANA timezone conversion.	Archived reference MCP server that lets Claude and other MCP clients read and post in a Slack workspace via a bot token.
Category	MCP Servers	MCP Servers
Pricing	Free· Free and open source (MIT-licensed reference server maintained by the Model Context Protocol project).	Free· Free / open-source (MIT). Requires a Slack workspace and a Slack bot token; Slack itself is free/paid.
Model	—	—
Editorial score	—	—
Use cases	Grounding current-time answers in a chat assistantTimezone conversion for distributed team schedulingMeeting-time suggestions across regionsLog-timestamp interpretation during incident triageTravel-planning assistantsCron and scheduled-job explanationDST-aware reminders in agent workflowsCorrecting model timestamps in RAG citations	Channel triage and summarisationAutomated thread digestsPosting AI-generated status updatesCross-channel search and reportingStandup and retro note postingOn-call escalation repliesUser and profile lookup for routingReaction-based workflow signallingMCP server reference implementation
Pros	Fixes a real, common LLM failure mode: guessing the current time or botching a timezone conversion Zero-config for most users -- uvx mcp-server-time works instantly on any MCP client Ships as an official reference server, so it stays in step with MCP protocol changes Three install paths (uv, pip, Docker) cover local dev, servers, and sandboxed agents Uses IANA timezone names and reports DST status, so results are unambiguous Tiny surface area (two tools) makes it safe to grant blanket permission to	Official reference implementation from the modelcontextprotocol project — small, readable TypeScript that documents the MCP tool pattern well Covers the eight highest-value Slack primitives (list, post, reply, react, history, thread, users, profile) with minimal ceremony Ships as both an npx package and a Docker image, so it drops straight into Claude Desktop, Cursor, or any MCP client with a JSON config snippet Standard Slack bot-token auth (xoxb-) with clearly scoped OAuth permissions — easy to reason about and to revoke Open-source under MIT, so forking or vendoring for internal hardening is straightforward Good starting point for learning how to write your own MCP server against a REST API
Cons	Only two tools -- no date arithmetic, no natural-language parsing, no recurring-event math Relies on the host's tzdata; stale OS images can return incorrect DST results No network time source -- accuracy is only as good as the machine's own clock Documentation is a README; no hosted docs site, changelog, or version-support policy Python-only implementation means an extra runtime if your stack is otherwise Node or Go	Archived by the maintainer on 29 May 2025 — no upstream bug fixes, security patches, or Slack API compatibility updates Read-only surface for channels (public channels only by default) and no DM, private-channel, search, files, or canvas support out of the box No pagination helpers or rate-limit backoff beyond what the Slack SDK provides, so bulk history pulls in large workspaces can be fragile Requires a workspace admin to install a bot app and mint a token, which is a real blocker in locked-down enterprise Slack tenants Bot-token model means every action is attributed to the bot user, not the human operating the assistant, which complicates audit trails
Website	github.com	github.com

Pick MCP Time Server if

✅ Fixes a real, common LLM failure mode: guessing the current time or botching a timezone conversion
✅ Zero-config for most users -- uvx mcp-server-time works instantly on any MCP client
✅ Ships as an official reference server, so it stays in step with MCP protocol changes
✅ Three install paths (uv, pip, Docker) cover local dev, servers, and sandboxed agents

Pick Slack MCP Server if

✅ Official reference implementation from the modelcontextprotocol project — small, readable TypeScript that documents the MCP tool pattern well
✅ Covers the eight highest-value Slack primitives (list, post, reply, react, history, thread, users, profile) with minimal ceremony
✅ Ships as both an npx package and a Docker image, so it drops straight into Claude Desktop, Cursor, or any MCP client with a JSON config snippet
✅ Standard Slack bot-token auth (xoxb-) with clearly scoped OAuth permissions — easy to reason about and to revoke

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