slack-agent

name	slack-agent
description	Use when working on Slack agent/bot code, Chat SDK applications, or projects using `chat` and `@chat-adapter/slack`. Provides development patterns, testing requirements, and quality standards.
version	4.0.0
user-invocable	true

Slack Agent Development Skill (Chat SDK)

This skill builds Slack agents on the Chat SDK: chat + @chat-adapter/slack running on Next.js (App Router) deployed to Vercel.

Skill Invocation Handling

When this skill is invoked via /slack-agent, check for arguments and route accordingly:

Command Arguments

Argument	Action
new	Run the setup wizard from Phase 1. Read ./wizard/1-project-setup.md and guide the user through creating a new Slack agent.
configure	Start wizard at Phase 2 or 3 for existing projects
deploy	Start wizard at Phase 5 for production deployment
test	Start wizard at Phase 6 to set up testing
(no argument)	Auto-detect based on project state (see below)

Auto-Detection (No Argument)

If invoked without arguments, detect the project state and route appropriately:

1. No package.json with chat → Treat as new, start Phase 1
2. Has project but no customized manifest.json → Start Phase 2
3. Has project but no .env file → Start Phase 3
4. Has .env but not tested → Start Phase 4
5. Tested but not deployed → Start Phase 5
6. Otherwise → Provide general assistance using this skill's patterns

Wizard Phases

The wizard is located in ./wizard/ with these phases:

• 1-project-setup.md — Understand purpose, generate custom implementation plan
• 1b-approve-plan.md — Present plan for user approval before scaffolding
• 2-create-slack-app.md — Customize manifest, create app in Slack
• 3-configure-environment.md — Set up .env with credentials
• 4-test-locally.md — Dev server + ngrok tunnel
• 5-deploy-production.md — Vercel deployment
• 6-setup-testing.md — Vitest configuration

IMPORTANT: For new projects, you MUST:

1. Read ./wizard/1-project-setup.md first
2. Ask the user what kind of agent they want to build
3. Generate a custom implementation plan using ./reference/agent-archetypes.md
4. Present the plan for approval (Phase 1b) BEFORE scaffolding the project
5. Only proceed to scaffold after the plan is approved

---

General Development Guidance

You are working on a Slack agent project. Follow these mandatory practices for all code changes.

Project Stack

• Framework: Next.js (App Router)
• Chat SDK: chat + @chat-adapter/slack for Slack bot functionality
• State: @chat-adapter/state-redis for state persistence (or in-memory for development)
• AI: AI SDK v6 with @ai-sdk/openai
• Linting: Biome
• Package Manager: pnpm

{
  "dependencies": {
    "ai": "^6.0.0",
    "@ai-sdk/openai": "latest",
    "chat": "latest",
    "@chat-adapter/slack": "latest",
    "@chat-adapter/state-redis": "latest",
    "zod": "^3.x",
    "next": "^15.x"
  }
}

Note: Pookie uses @ai-sdk/openai directly. OPENAI_API_KEY is read automatically by the SDK at runtime. Other providers can be swapped in by changing the import and model string.

---

Quality Standards (MANDATORY)

These quality requirements MUST be followed for every code change. There are no exceptions.

After EVERY File Modification

1. Run linting immediately:

   pnpm lint
   

   • If errors exist, run pnpm lint --write for auto-fixes
   • Manually fix remaining issues
   • Re-run pnpm lint to verify

2. Check for corresponding test file:

   • If you modified foo.ts, check if foo.test.ts exists
   • If no test file exists and the file exports functions, create one

Before Completing ANY Task

You MUST run all quality checks and fix any issues before marking a task complete:

pnpm typecheck
pnpm lint
pnpm test

Do NOT complete a task if any of these fail. Fix the issues first.

Unit Tests Required

For ANY code change, you MUST write or update unit tests.

• Location: Co-located *.test.ts files or lib/__tests__/
• Framework: Vitest
• Coverage: All exported functions must have tests

Example test structure:

import { describe, it, expect, vi } from "vitest";
import { myFunction } from "./my-module";

describe("myFunction", () => {
  it("should handle normal input", () => {
    expect(myFunction("input")).toBe("expected");
  });

  it("should handle edge cases", () => {
    expect(myFunction("")).toBe("default");
  });
});

E2E Tests for User-Facing Changes

If you modify:

• Bot mention handlers / Slack message handlers
• Slash commands
• Interactive components (buttons, modals)
• Bot responses

You MUST add or update E2E tests that verify the full flow.

---

Bot Setup Patterns (CRITICAL)

Use the Chat SDK to define your bot instance. This is the central entry point for all Slack bot functionality.

Bot Instance (lib/bot.ts or lib/bot.tsx)

import { Chat } from "chat";
import { createSlackAdapter } from "@chat-adapter/slack";
import { createRedisState } from "@chat-adapter/state-redis";

export const bot = new Chat({
  userName: "mybot",
  adapters: {
    slack: createSlackAdapter(),
  },
  state: createRedisState(),
});

Note: If your bot uses JSX components (Card, Button, etc.), the file must use the .tsx extension.

Webhook Route (app/api/webhooks/[platform]/route.ts)

import { after } from "next/server";
import { bot } from "@/lib/bot";

export async function POST(
  request: Request,
  context: { params: Promise<{ platform: string }> },
) {
  const { platform } = await context.params;
  const handler = bot.webhooks[platform as keyof typeof bot.webhooks];
  if (!handler) return new Response("Unknown platform", { status: 404 });
  return handler(request, { waitUntil: (task) => after(() => task) });
}

The Chat SDK automatically handles:

• Content-type detection (JSON vs form-urlencoded)
• URL verification challenges
• Slack's 3-second ack timeout
• Background processing via waitUntil
• Signature verification

---

Event Handler Patterns

Mention Handler

bot.onNewMention(async (thread, message) => {
  await thread.subscribe();
  const text = message.text;
  await thread.post(`Processing your request: "${text}"`);
});

Subscribed Message Handler

bot.onSubscribedMessage(async (thread, message) => {
  await thread.post(`You said: ${message.text}`);
});

Slash Command Handler

bot.onSlashCommand("/mycommand", async (event) => {
  const text = event.text;
  await event.thread.post(`Processing: ${text}`);

  const result = await generateWithAI(text);
  await event.thread.post(result);
});

The Chat SDK handles background processing automatically via waitUntil — there's no need for fire-and-forget patterns.

Action Handler (Buttons, Menus)

bot.onAction("button_click", async (event) => {
  await event.thread.post(`Button clicked with value: ${event.value}`);
});

Reaction Handler

bot.onReaction("thumbsup", async (event) => {
  await event.thread.post("Thanks for the thumbs up!");
});

---

Implementation Gotchas

1. Private Channel Access

Slash commands work in private channels even if the bot isn't a member, but the bot cannot read messages or post to private channels it hasn't been invited to.

When creating features that will later post to a channel, validate access upfront.

2. Graceful Degradation for Channel Context

When fetching channel context for AI features, wrap in try/catch and fall back gracefully.

3. Vercel Cron Endpoint Authentication

Protect cron endpoints with a CRON_SECRET environment variable:

import { NextRequest, NextResponse } from "next/server";

export async function GET(request: NextRequest) {
  const authHeader = request.headers.get("authorization");
  if (authHeader !== `Bearer ${process.env.CRON_SECRET}`) {
    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
  }
  return NextResponse.json({ success: true });
}

4. vercel.json Cron Configuration

Configure cron jobs in vercel.json:

{
  "crons": [
    {
      "path": "/api/cron/my-job",
      "schedule": "0 * * * *"
    }
  ]
}

5. AWS Credentials on Vercel (Use OIDC)

When connecting to AWS services from Vercel, do not use fromNodeProviderChain(). Use Vercel's OIDC mechanism:

import { awsCredentialsProvider } from "@vercel/functions/oidc";

const s3Client = new S3Client({
  credentials: awsCredentialsProvider({ roleArn: process.env.AWS_ROLE_ARN! }),
});

6. TSConfig for JSX Components

When using Chat SDK JSX components (<Card>, <Button>, etc.), your tsconfig.json must include:

{
  "compilerOptions": {
    "jsx": "react-jsx",
    "jsxImportSource": "chat"
  }
}

---

AI Integration

Pookie uses @ai-sdk/openai for LLM access. OPENAI_API_KEY is read automatically by the SDK at runtime.

Basic Usage

import { generateText, streamText } from "ai";
import { openai } from "@ai-sdk/openai";

const result = await generateText({
  model: openai("gpt-4o-mini"),
  maxOutputTokens: 1000,
  prompt: "Your prompt here",
});

console.log(result.text);
console.log(result.usage.inputTokens);
console.log(result.usage.outputTokens);

Streaming Responses to Slack

const result = await streamText({
  model: openai("gpt-4o-mini"),
  maxOutputTokens: 1000,
  prompt: userMessage,
});

await thread.post(result.textStream);

The Chat SDK handles streaming updates to Slack automatically.

With Tools

import { tool } from "ai";
import { z } from "zod";

const result = await generateText({
  model: openai("gpt-4o-mini"),
  maxOutputTokens: 1000,
  tools: {
    getWeather: tool({
      description: "Get weather for a location",
      inputSchema: z.object({
        location: z.string().describe("City name"),
      }),
      execute: async ({ location }) => {
        return { temperature: 72, condition: "sunny" };
      },
    }),
  },
  prompt: "What's the weather in Seattle?",
});

AI SDK v6 API Changes

| v4/v5 | v6 |