Claude in Slack & Claude Tag: The Full Ecosystem Guide

"Claude in Slack" is being reborn as Claude Tag - Anthropic's persistent, multiplayer @Claude teammate that lives in your channels, launched in beta on June 23, 2026. It's a meaningfully different product from the old read-and-reply app: shared per channel, accumulating memory over time, working asynchronously on multi-step tasks, governed by org spend limits and an audit log. This guide explains what Claude Tag does, what it costs, the broader MCP Apps ecosystem it's part of, the August 3 migration, and - for builders - how to ship your own Slack assistant on the same underlying model.

What changed

If you've used Claude in Slack — the app that let you DM Claude or summon it in a thread — it's being replaced. On June 23, 2026, Anthropic launched Claude Tag in beta: a persistent, multiplayer @Claude teammate that lives in your channels, remembers context over time, and works asynchronously on multi-step tasks. It's a different class of product from the old read-and-reply bot.

What Claude Tag is

Tag @Claude in a channel and hand it a task. Claude Tag decomposes the request into steps, executes them with the tools, data, and codebases you've granted, and reports back in-thread. Per Anthropic, it runs on Claude Opus 4.8. The old Claude in Slack mostly answered when asked; Claude Tag is built to act — including, optionally, proactively.

Anthropic reports that 65% of its product team's code now comes from its internal version of Claude Tag — a self-reported internal usage figure (attributable to head of product Cat Wu), not an independent benchmark, but a signal of how it's meant to be used.

Multiplayer & memory

The design choices that make Claude Tag distinct:

• Multiplayer — one shared Claude per channel. Everyone sees what it's doing and can jump in to steer it, like a teammate rather than a private chatbot.
• Persistent memory — it learns your team's context from channel activity over time, so it needs less re-explaining.
• Scoped identities — memories and access are isolated per identity. A sales Claude doesn't pass memory to an engineering Claude.
• Ambient mode (optional) — Claude can post proactive updates rather than waiting to be tagged.
• Audit log — admins can review every action Claude took and which user triggered it.

Plans, cost & controls

Claude Tag requires a Claude Team or Enterprise plan and is token-metered — there's no fixed per-task list price. Admins govern spend with per-channel limits:

Admins are notified at 75% and 95% of any limit. Channel tagging draws on the organization's usage balance; direct messages run on the individual user's own claude.ai account. The underlying model's API rates set the economics:

Anthropic official pricing, June 2026. Claude Tag bills the tokens its work consumes against the limits above.

The MCP Apps ecosystem

Claude Tag is the Slack expression of a broader push. On January 26, 2026, Anthropic launched Interactive Apps ("MCP Apps") — integrations that render interactive UI inside Claude, built on the open Model Context Protocol. Launch partners: Slack, Canva, Figma, Box, and Clay live, with Salesforce "coming soon," available to Pro, Max, Team, and Enterprise users at claude.ai/directory.

Under the hood, the MCP Apps extension (SEP-1865), published November 21, 2025, was co-authored by MCP maintainers at Anthropic and OpenAI plus the MCP-UI creators. It defines a ui:// URI scheme, sandboxed iframes, text/html content, and JSON-RPC over postMessage — building on MCP-UI and OpenAI's Apps SDK. The takeaway: the Slack integration isn't a one-off; it's part of an open, cross-vendor app layer for assistants.

The August 3 migration

Per Anthropic's official support documentation, Claude in Slack switches over to the Claude Tag experience on August 3, 2026, opted in by an organization's Primary Owner or Owner. Admins can opt in earlier to configure spend limits, scoped identities, and permissions on their own timeline before the automatic switchover. If your team relies on the old app, plan the transition — the interaction model and governance are different.

Build your own

Claude Tag is a hosted product on Team/Enterprise plans — you can't resell or self-host it. But the capability is buildable: the underlying model, Claude Opus 4.8 ($5/$25), is available via the API, so you can ship a Slack assistant with your own tools, memory store, and spend rules wired to Slack's events API. That's the right path if you need custom logic, your own data boundaries, or a model the hosted product doesn't offer.

Through an OpenAI-compatible gateway like DataLLM Lab, you reach Claude (Opus 4.7, Sonnet 4.6, Haiku 4.5) and 300+ other models behind one key — handy for routing a Slack bot's cheap tasks to a small model and escalating the hard ones to a flagship, with failover.

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