feat(linkedin-thought-leadership): v1.0.0 — initial open-source import

Build LinkedIn thought leadership with algorithmic understanding,
strategic consistency, and AI-assisted content creation. Updated for
the January 2026 360Brew algorithm change.

16 agents, 25 commands, 6 skills, 9 hooks, 24 reference docs.

Personal data sanitized: voice samples generalized to template,
high-engagement posts cleared, region-specific references replaced
with placeholders.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

plugins/linkedin-thought-leadership/scripts/analytics/src/utils/alerts.ts

@@ -0,0 +1,162 @@
+import type {
+  PostAnalytics,
+  Alert,
+  PostMetrics,
+} from "../models/types.js";
+import { ALERT_THRESHOLDS } from "../models/types.js";
+import {
+  mean,
+  deviationsFromMean,
+  percentChange,
+} from "./stats.js";
+
+/**
+ * Analyze posts for spikes and drops based on standard deviation thresholds.
+ * For each post, checks if its metric value deviates significantly from the mean.
+ * Returns array of alerts sorted by severity (critical first).
+ */
+export function detectAlerts(
+  posts: PostAnalytics[],
+  metricKey: keyof PostMetrics = "impressions"
+): Alert[] {
+  if (posts.length === 0) return [];
+
+  const alerts: Alert[] = [];
+
+  // Extract metric values
+  const values = posts.map((post) => post.metrics[metricKey]);
+  const avg = mean(values);
+
+  // Check each post for significant deviations
+  for (const post of posts) {
+    const value = post.metrics[metricKey];
+    const deviations = deviationsFromMean(value, values);
+
+    // Spike detection
+    if (deviations > ALERT_THRESHOLDS.spike) {
+      alerts.push({
+        type: "spike",
+        severity: "info",
+        metric: metricKey,
+        message: `Post "${post.title}" has unusually high ${metricKey}: ${value.toLocaleString()} (${deviations.toFixed(1)} std deviations above mean)`,
+        postId: post.id,
+        value,
+        baseline: avg,
+        deviations,
+      });
+    }
+
+    // Drop detection
+    if (deviations < ALERT_THRESHOLDS.drop) {
+      alerts.push({
+        type: "drop",
+        severity: "warning",
+        metric: metricKey,
+        message: `Post "${post.title}" has unusually low ${metricKey}: ${value.toLocaleString()} (${Math.abs(deviations).toFixed(1)} std deviations below mean)`,
+        postId: post.id,
+        value,
+        baseline: avg,
+        deviations,
+      });
+    }
+  }
+
+  // Sort by severity: critical > warning > info
+  const severityOrder = { critical: 0, warning: 1, info: 2 };
+  alerts.sort((a, b) => severityOrder[a.severity] - severityOrder[b.severity]);
+
+  return alerts;
+}
+
+/**
+ * Compare week-over-week metrics and generate alerts for significant changes.
+ * Uses percentChange and ALERT_THRESHOLDS for weekly drops and spikes.
+ */
+export function detectWeeklyAlerts(
+  currentWeekMetrics: { impressions: number; engagementRate: number },
+  previousWeekMetrics: { impressions: number; engagementRate: number }
+): Alert[] {
+  const alerts: Alert[] = [];
+
+  // Analyze impressions
+  const impressionChange = percentChange(
+    currentWeekMetrics.impressions,
+    previousWeekMetrics.impressions
+  );
+
+  if (impressionChange < ALERT_THRESHOLDS.weeklyDropCritical) {
+    alerts.push({
+      type: "drop",
+      severity: "critical",
+      metric: "impressions",
+      message: `Critical drop in weekly impressions: ${impressionChange.toFixed(1)}% (from ${previousWeekMetrics.impressions.toLocaleString()} to ${currentWeekMetrics.impressions.toLocaleString()})`,
+      value: currentWeekMetrics.impressions,
+      baseline: previousWeekMetrics.impressions,
+      deviations: impressionChange / 10, // Rough conversion to deviations
+    });
+  } else if (impressionChange < ALERT_THRESHOLDS.weeklyDropWarning) {
+    alerts.push({
+      type: "drop",
+      severity: "warning",
+      metric: "impressions",
+      message: `Weekly impressions dropped by ${Math.abs(impressionChange).toFixed(1)}%: from ${previousWeekMetrics.impressions.toLocaleString()} to ${currentWeekMetrics.impressions.toLocaleString()}`,
+      value: currentWeekMetrics.impressions,
+      baseline: previousWeekMetrics.impressions,
+      deviations: impressionChange / 10,
+    });
+  } else if (impressionChange > ALERT_THRESHOLDS.weeklySpikeInfo) {
+    alerts.push({
+      type: "spike",
+      severity: "info",
+      metric: "impressions",
+      message: `Strong growth in weekly impressions: +${impressionChange.toFixed(1)}% (from ${previousWeekMetrics.impressions.toLocaleString()} to ${currentWeekMetrics.impressions.toLocaleString()})`,
+      value: currentWeekMetrics.impressions,
+      baseline: previousWeekMetrics.impressions,
+      deviations: impressionChange / 10,
+    });
+  }
+
+  // Analyze engagement rate
+  const engagementChange = percentChange(
+    currentWeekMetrics.engagementRate,
+    previousWeekMetrics.engagementRate
+  );
+
+  if (engagementChange < ALERT_THRESHOLDS.weeklyDropCritical) {
+    alerts.push({
+      type: "drop",
+      severity: "critical",
+      metric: "engagementRate",
+      message: `Critical drop in weekly engagement rate: ${engagementChange.toFixed(1)}% (from ${previousWeekMetrics.engagementRate.toFixed(2)}% to ${currentWeekMetrics.engagementRate.toFixed(2)}%)`,
+      value: currentWeekMetrics.engagementRate,
+      baseline: previousWeekMetrics.engagementRate,
+      deviations: engagementChange / 10,
+    });
+  } else if (engagementChange < ALERT_THRESHOLDS.weeklyDropWarning) {
+    alerts.push({
+      type: "drop",
+      severity: "warning",
+      metric: "engagementRate",
+      message: `Weekly engagement rate dropped by ${Math.abs(engagementChange).toFixed(1)}%: from ${previousWeekMetrics.engagementRate.toFixed(2)}% to ${currentWeekMetrics.engagementRate.toFixed(2)}%`,
+      value: currentWeekMetrics.engagementRate,
+      baseline: previousWeekMetrics.engagementRate,
+      deviations: engagementChange / 10,
+    });
+  } else if (engagementChange > ALERT_THRESHOLDS.weeklySpikeInfo) {
+    alerts.push({
+      type: "spike",
+      severity: "info",
+      metric: "engagementRate",
+      message: `Strong growth in weekly engagement rate: +${engagementChange.toFixed(1)}% (from ${previousWeekMetrics.engagementRate.toFixed(2)}% to ${currentWeekMetrics.engagementRate.toFixed(2)}%)`,
+      value: currentWeekMetrics.engagementRate,
+      baseline: previousWeekMetrics.engagementRate,
+      deviations: engagementChange / 10,
+    });
+  }
+
+  // Sort by severity: critical > warning > info
+  const severityOrder = { critical: 0, warning: 1, info: 2 };
+  alerts.sort((a, b) => severityOrder[a.severity] - severityOrder[b.severity]);
+
+  return alerts;
+}