PostHog Debug Bundle Skill

PostHog Debug Bundle

Current State

!node --version 2>/dev/null || echo 'N/A' !npm list posthog-js posthog-node 2>/dev/null | grep posthog || echo 'No PostHog SDK found'

Overview

Collect diagnostic evidence for PostHog support tickets. Gathers SDK versions, API connectivity, feature flag status, event flow verification, and redacted configuration. All secrets are automatically redacted.

Prerequisites

PostHog SDK installed in project
Access to environment variables
curl and jq available

Instructions

Step 1: Run Full Diagnostic Script

#!/bin/bash
set -euo pipefail

BUNDLE_DIR="posthog-debug-$(date +%Y%m%d-%H%M%S)"
mkdir -p "$BUNDLE_DIR"

echo "=== PostHog Debug Bundle ===" > "$BUNDLE_DIR/summary.txt"
echo "Generated: $(date -u +%Y-%m-%dT%H:%M:%SZ)" >> "$BUNDLE_DIR/summary.txt"
echo "" >> "$BUNDLE_DIR/summary.txt"

# --- Environment ---
echo "--- Runtime Environment ---" >> "$BUNDLE_DIR/summary.txt"
echo "Node: $(node --version 2>/dev/null || echo 'not found')" >> "$BUNDLE_DIR/summary.txt"
echo "npm: $(npm --version 2>/dev/null || echo 'not found')" >> "$BUNDLE_DIR/summary.txt"
echo "Python: $(python3 --version 2>/dev/null || echo 'not found')" >> "$BUNDLE_DIR/summary.txt"
echo "OS: $(uname -srm)" >> "$BUNDLE_DIR/summary.txt"
echo "" >> "$BUNDLE_DIR/summary.txt"

# --- SDK Versions ---
echo "--- PostHog SDK Versions ---" >> "$BUNDLE_DIR/summary.txt"
npm list posthog-js posthog-node 2>/dev/null >> "$BUNDLE_DIR/summary.txt" || echo "No npm PostHog packages" >> "$BUNDLE_DIR/summary.txt"
pip3 show posthog 2>/dev/null | grep -E "Name|Version" >> "$BUNDLE_DIR/summary.txt" || true
echo "" >> "$BUNDLE_DIR/summary.txt"

# --- API Connectivity ---
echo "--- API Connectivity ---" >> "$BUNDLE_DIR/summary.txt"
echo -n "US Cloud ingest: " >> "$BUNDLE_DIR/summary.txt"
curl -s -o /dev/null -w "%{http_code} (%{time_total}s)" https://us.i.posthog.com/healthz >> "$BUNDLE_DIR/summary.txt" 2>&1
echo "" >> "$BUNDLE_DIR/summary.txt"
echo -n "EU Cloud ingest: " >> "$BUNDLE_DIR/summary.txt"
curl -s -o /dev/null -w "%{http_code} (%{time_total}s)" https://eu.i.posthog.com/healthz >> "$BUNDLE_DIR/summary.txt" 2>&1
echo "" >> "$BUNDLE_DIR/summary.txt"
echo -n "App API: " >> "$BUNDLE_DIR/summary.txt"
curl -s -o /dev/null -w "%{http_code} (%{time_total}s)" https://app.posthog.com/api/ >> "$BUNDLE_DIR/summary.txt" 2>&1
echo "" >> "$BUNDLE_DIR/summary.txt"

# --- Environment Variables (redacted) ---
echo "" >> "$BUNDLE_DIR/summary.txt"
echo "--- Environment Variables (redacted) ---" >> "$BUNDLE_DIR/summary.txt"
env | grep -i posthog | sed 's/=.*/=***REDACTED***/' >> "$BUNDLE_DIR/summary.txt" 2>/dev/null || echo "No POSTHOG env vars found" >> "$BUNDLE_DIR/summary.txt"
echo "" >> "$BUNDLE_DIR/summary.txt"

# --- Key Type Detection ---
echo "--- API Key Types ---" >> "$BUNDLE_DIR/summary.txt"
if [ -n "${NEXT_PUBLIC_POSTHOG_KEY:-}" ]; then
  echo "Project key prefix: $(echo "$NEXT_PUBLIC_POSTHOG_KEY" | head -c 4)_..." >> "$BUNDLE_DIR/summary.txt"
fi
if [ -n "${POSTHOG_PERSONAL_API_KEY:-}" ]; then
  echo "Personal key prefix: $(echo "$POSTHOG_PERSONAL_API_KEY" | head -c 4)_..." >> "$BUNDLE_DIR/summary.txt"
fi

echo "" >> "$BUNDLE_DIR/summary.txt"
echo "Bundle complete: $BUNDLE_DIR/" >> "$BUNDLE_DIR/summary.txt"

Step 2: Test Event Capture Flow

set -euo pipefail
# Send a test event and verify it was accepted
RESPONSE=$(curl -s -w "\n%{http_code}" -X POST 'https://us.i.posthog.com/capture/' \
  -H 'Content-Type: application/json' \
  -d "{
    \"api_key\": \"${NEXT_PUBLIC_POSTHOG_KEY}\",
    \"event\": \"debug_bundle_test\",
    \"distinct_id\": \"debug-$(date +%s)\",
    \"properties\": {\"test\": true}
  }")

HTTP_CODE=$(echo "$RESPONSE" | tail -1)
BODY=$(echo "$RESPONSE" | head -1)

echo "Capture test: HTTP $HTTP_CODE"
echo "Response: $BODY"

# Expected: HTTP 200, Response: {"status": 1}

Step 3: Check Feature Flag Status

set -euo pipefail
# Evaluate flags via the /decide endpoint
curl -s -X POST 'https://us.i.posthog.com/decide/?v=3' \
  -H 'Content-Type: application/json' \
  -d "{
    \"api_key\": \"${NEXT_PUBLIC_POSTHOG_KEY}\",
    \"distinct_id\": \"debug-test\"
  }" | jq '{
    featureFlags: .featureFlags,
    errorsWhileComputingFlags: .errorsWhileComputingFlags,
    sessionRecording: (.sessionRecording != false)
  }'

Step 4: Verify Admin API Access

set -euo pipefail
# Test personal API key (if available)
if [ -n "${POSTHOG_PERSONAL_API_KEY:-}" ]; then
  curl -s "https://app.posthog.com/api/projects/" \
    -H "Authorization: Bearer $POSTHOG_PERSONAL_API_KEY" | \
    jq '[.[] | {id, name, created_at}]' > "$BUNDLE_DIR/projects.json" 2>/dev/null || \
    echo "Personal API key failed" >> "$BUNDLE_DIR/summary.txt"
fi

Step 5: Package and Review

set -euo pipefail
# Review for any accidentally included secrets
grep -rn "phc_\|phx_\|Bearer " "$BUNDLE_DIR/" | grep -v REDACTED | grep -v "prefix:" && \
  echo "WARNING: Potential secret found — review before sharing" || \
  echo "No secrets detected in bundle"

# Package
tar -czf "$BUNDLE_DIR.tar.gz" "$BUNDLE_DIR"
echo "Bundle created: $BUNDLE_DIR.tar.gz ($(du -h "$BUNDLE_DIR.tar.gz" | cut -f1))"

Checklist

| Item | Collected | Purpose | |------|-----------|---------| | Node/Python versions | Yes | SDK compatibility | | PostHog SDK versions | Yes | Version-specific bugs | | API connectivity | Yes | Network/firewall issues | | Event capture test | Yes | End-to-end verification | | Feature flag status | Yes | Flag evaluation issues | | Environment vars (redacted) | Yes | Configuration problems | | Key type detection | Yes | Wrong key type errors |

Error Handling

| Issue | Cause | Solution | |-------|-------|----------| | All connectivity fails | Corporate firewall | Check proxy settings, try VPN | | Capture returns non-200 | Invalid API key | Verify phc_ key in project settings | | /decide fails | Key/host mismatch | Ensure key matches the host region | | Personal API 401 | Expired key | Regenerate in Settings > Personal API Keys |

Output

posthog-debug-YYYYMMDD-HHMMSS.tar.gz archive containing:
- summary.txt — Runtime, SDK versions, connectivity, redacted config
- projects.json — Project list (if personal key available)
- Test event capture and flag evaluation results

Resources

Next Steps

For rate limit issues, see posthog-rate-limits.

Agent Skills: PostHog Debug Bundle

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