rohitg00/ai-engineering-from-scratch · error · Error

SLACK_SIGNING_SECRET is required

Error message

SLACK_SIGNING_SECRET is required

What it means

Error "SLACK_SIGNING_SECRET is required" thrown in rohitg00/ai-engineering-from-scratch.

Source

Thrown at phases/19-capstone-projects/06-devops-troubleshooting-agent/code/ts/src/server.ts:32

      }),
    )
    .optional(),
  response_url: z.string().optional(),
});

export type AppOptions = {
  signingSecret?: string;
  outboundLog?: OutboundCall[];
  now?: () => number;
};

export function buildApp(options: AppOptions = {}): {
  app: Hono;
  outboundLog: OutboundCall[];
} {
  const signingSecret = options.signingSecret || process.env.SLACK_SIGNING_SECRET;
  if (!signingSecret) {
    throw new Error("SLACK_SIGNING_SECRET is required");
  }
  const outboundLog: OutboundCall[] = options.outboundLog ?? [];
  const now = options.now ?? (() => Math.floor(Date.now() / 1000));
  const app = new Hono();

  app.get("/health", (c) => c.json({ ok: true, outboundCount: outboundLog.length }));

  app.post("/slack/command", async (c) => {
    const rawBody = await c.req.text();
    const timestamp = c.req.header("x-slack-request-timestamp") ?? "";
    const signature = c.req.header("x-slack-signature") ?? "";
    const verdict = verifySlackSignature({
      signingSecret,
      timestamp,
      signature,
      rawBody,
      nowSeconds: now(),
    });

View on GitHub (pinned to 39ea8a1c6d)

When it happens

Trigger: Thrown at phases/19-capstone-projects/06-devops-troubleshooting-agent/code/ts/src/server.ts:32 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of rohitg00/ai-engineering-from-scratch@39ea8a1c6d (2026-08-26). Data as JSON: /api/errors/18ae29f48fbea463. Report an issue: GitHub.