feat: add official Slack plugin (slackapi/slack-skills-plugin) to the marketplace

.agents/plugins/marketplace.json

@@ -1331,6 +1331,18 @@
         "authentication": "ON_INSTALL"
       },
       "category": "Tooling"
+    },
+    {
+      "name": "slack",
+      "source": {
+        "source": "url",
+        "url": "https://github.com/slackapi/slack-skills-plugin.git"
+      },
+      "policy": {
+        "installation": "AVAILABLE",
+        "authentication": "ON_INSTALL"
+      },
+      "category": "Productivity"
     }
   ]
 }

.claude-plugin/marketplace.json

@@ -1778,6 +1778,36 @@
         "repo": "firecrawl/firecrawl-claude-plugin"
       },
       "homepage": "https://www.firecrawl.dev/?utm_source=claude-code-plugins&utm_medium=integration"
+    },
+    {
+      "name": "slack",
+      "description": "Official Slack plugin - interact with your workspace through the hosted Slack MCP server (search, read, and send messages, canvases, lists) and build Slack apps with developer skills for Block Kit, the Web API, the Slack CLI, and app testing and deployment",
+      "category": "productivity",
+      "keywords": ["slack", "mcp", "block-kit", "bolt", "slack-cli", "slack-api", "messaging"],
+      "tags": ["mcp", "skills", "productivity"],
+      "source": {
+        "source": "github",
+        "repo": "slackapi/slack-skills-plugin"
+      },
+      "homepage": "https://docs.slack.dev/ai/slack-skills-plugin",
+      "relevance": {
+        "topic": "Slack",
+        "signals": {
+          "cli": ["slack"],
+          "hosts": ["slack.com", "api.slack.com", "docs.slack.dev"],
+          "filesRead": ["**/.slack/**"],
+          "manifestDeps": [
+            {
+              "file": "[/\\\\]package\\.json$",
+              "pattern": "\"@slack/(bolt|web-api)\"\\s*:"
+            },
+            {
+              "file": "[/\\\\](requirements[^/\\\\]*\\.txt|pyproject\\.toml)$",
+              "pattern": "slack[-_](bolt|sdk)"
+            }
+          ]
+        }
+      }
     }
   ]
 }

README.md

@@ -90,6 +90,11 @@ Official Firecrawl plugin, the context API for AI agents: web search, page scrap
 
 **Install:** `/plugin install firecrawl@pleaseai` | **Repository:** [firecrawl/firecrawl-claude-plugin](https://github.com/firecrawl/firecrawl-claude-plugin)
 
+#### Slack
+Official Slack plugin — work with your Slack workspace through the hosted Slack MCP server (search, read, and send messages; canvases and lists), plus developer skills for Block Kit, the Web API, the Slack CLI, and creating, testing, and deploying Slack apps.
+
+**Install:** `/plugin install slack@pleaseai` | **Repository:** [slackapi/slack-skills-plugin](https://github.com/slackapi/slack-skills-plugin)
+
 #### ASK
 ASK (Agent Skills Kit) — AI agent skills for managing library documentation registry entries.
 
@@ -608,6 +613,7 @@ Once the marketplace is added (or files copied), the following plugins are avail
 /plugin install gemini@pleaseai
 /plugin install cloudflare@pleaseai
 /plugin install firecrawl@pleaseai
+/plugin install slack@pleaseai
 /plugin install ask@pleaseai
 
 # Built-in plugins