feat(methods): add chat.postMessage example

.github/workflows/test.yml

@@ -16,6 +16,7 @@ jobs:
           - "ai/slackbot-mcp-client/rich-responses/mcp-apps"
           - "ai/slackbot-mcp-client/slack-identity"
           - "block-kit"
+          - "methods"
     steps:
       - name: Checkout code
         uses: actions/checkout@v7
@@ -29,4 +30,4 @@ jobs:
           npm install
           npm run lint
           npm run check
-          npm run test
+          npm test --if-present

README.md

@@ -6,3 +6,4 @@ This collections of examples highlights features of a Slack app in the language
 
 - **[AI in Slack](./ai)**: Agent experiences and MCP features in an interactive conversation interface.
 - **[Block Kit](./block-kit)**: The framework of visual components arranged to create app layouts.
+- **[Methods](./methods)**: An interface for querying information from and enacting change in a Slack workspace.

methods/.gitignore

@@ -0,0 +1 @@
+node_modules

methods/README.md

@@ -0,0 +1,21 @@
+# Methods
+
+An interface for querying information from and enacting change in a Slack workspace.
+
+Read the [docs](https://docs.slack.dev/apis/web-api/) for explanations of concepts, or explore [reference](https://docs.slack.dev/reference/methods) pages for specific functionalities.
+
+## Making a request
+
+```sh
+$ cd src/chat  # Navigate to a method family
+$ slack install --environment local  # Create an app
+$ vim chat-post-message.js  # Edit arguments
+$ export SLACK_TOKEN=xoxb-example  # Set if unchanged
+$ slack run chat-post-message.js  # Make the request
+```
+
+## What's on call
+
+### chat
+
+- **[chat.postMessage](https://docs.slack.dev/reference/methods/chat.postmessage)**: Sends a message to a channel. [Implementation](./src/chat/chat-post-message.js).

methods/biome.json

@@ -0,0 +1,34 @@
+{
+  "$schema": "./node_modules/@biomejs/biome/configuration_schema.json",
+  "vcs": {
+    "enabled": true,
+    "clientKind": "git",
+    "useIgnoreFile": true
+  },
+  "files": {
+    "ignoreUnknown": false
+  },
+  "formatter": {
+    "enabled": true,
+    "indentStyle": "space"
+  },
+  "linter": {
+    "enabled": true,
+    "rules": {
+      "recommended": true
+    }
+  },
+  "javascript": {
+    "formatter": {
+      "quoteStyle": "double"
+    }
+  },
+  "assist": {
+    "enabled": true,
+    "actions": {
+      "source": {
+        "organizeImports": "on"
+      }
+    }
+  }
+}