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COMMSCOLLAB
Velocity5.0

Business communication and collaboration platform

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Slack rebuilds its developer platform around shipping in-channel AI agents.

ai-agentsblock-kitmcpstreaming-apisdeveloper-toolsoauth-security
◆Current state
Slack is well into a platform pivot, restructuring its CLI, Block Kit, and APIs around AI agent use cases. The 4.0.0 release in April formalized this with an agent-scaffolding command, sample agent apps, and a live-reloading dev workflow. Recent additions — streaming chat APIs, Card/Carousel/Alert blocks, and continued MCP server expansion — show the surface area for in-Slack agents widening fast.
◆Where it's heading
The platform is shifting from 'agents can post messages' to 'agents are first-class UI citizens'. The new chat.startStream / chat.appendStream / chat.stopStream methods change what an agent reply looks like, and the Card and Carousel blocks hint at richer multi-turn agent flows. Security work on PKCE and optional scopes is keeping pace, which tells you third-party agent developers are the audience, not just first-party features.
◆Prediction
Expect Slack to publish reference agents and likely a discovery or marketplace surface for agent apps within the next minor cycle, with streaming Block Kit becoming the canonical pattern shown in the docs.

◆Recent moves

  1. 1d ago

    New Block Kit data table block

    View source ↗
  2. 2d ago

    Release: Slack CLI v4.1.0

    A point release on top of the 4.0.0 agent-focused CLI, continuing the steady cadence of incremental improvements to the platform tooling rolled out since April.

    View source ↗
  3. 8d ago

    New Slack MCP Server tools released

    Slack continues to flesh out its MCP server with new tools, extending the same protocol Anthropic uses to broker model-to-app interactions. It is an incremental but coherent step in positioning Slack as a first-class destination for external agents.

    View source ↗
  4. 1mo ago

    New Block Kit blocks and Streaming API method updates

    ⚡ SPARK

    Streaming chat methods plus Alert, Card, and Carousel blocks land together — directly enabling token-by-token agent responses with rich visual containers, and arguably the most agent-shaped feature drop since the 4.0.0 platform release.

    View source ↗
  5. 1mo ago

    Slack CLI 4.0.0 reorients developer tools around agent scaffolding

    ⚡ SPARK

    The 4.0.0 release reframes the entire developer toolchain around agents — adding 'slack create agent', curated agent sample apps, local manifest handling, and file-watch live reload. It is the moment Slack explicitly declared agents the platform's center of gravity.

    View source ↗
  6. 1mo ago

    PKCE is now generally available!

    PKCE going GA closes a real gap for developers building Slack apps on desktop and mobile clients, where embedding a client secret has long been a known risk. It fits the broader pattern of hardening OAuth so third-party agent surfaces can be shipped safely.

    View source ↗