Highlighting NICE CXone Agent Assist Competitor Mentions via Agent Assist API with Go

What You Will Build

A Go service that constructs, validates, and applies competitor mention highlights to NICE CXone Agent Assist sessions using atomic PUT operations, sentiment validation pipelines, webhook synchronization, and structured audit logging.
Uses the NICE CXone Agent Assist REST API v2 with OAuth2 client credentials authentication.
Implemented in Go 1.21+ using only the standard library.

Prerequisites

• CXone OAuth2 confidential client with scopes: AgentAssist:Read, AgentAssist:Write, Interaction:Read, Webhook:Write
• CXone API version 2.0 (REST)
• Go 1.21+ runtime
• No external dependencies required

Authentication Setup

CXone uses standard OAuth2 client credentials flow. The token cache must support concurrent access and automatic refresh before expiration.

package main

import (
	"context"
	"crypto/rand"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"math/big"
	"net/http"
	"net/url"
	"sync"
	"time"
)

const (
	cxoneOAuthEndpoint = "https://login.cloud.nicecxone.com/oauth2/token"
	cxoneAPIBase       = "https://api.cloud.nicecxone.com/api/v2"
)

type OAuthToken struct {
	AccessToken string `json:"access_token"`
	TokenType   string `json:"token_type"`
	ExpiresIn   int64  `json:"expires_in"`
	RefreshToken string `json:"refresh_token,omitempty"`
}

type TokenCache struct {
	mu          sync.RWMutex
	token       *OAuthToken
	expiresAt   time.Time
	clientID    string
	clientSecret string
	scopes      string
}

func NewTokenCache(clientID, clientSecret, scopes string) *TokenCache {
	return &TokenCache{
		clientID:     clientID,
		clientSecret: clientSecret,
		scopes:       scopes,
	}
}

func (tc *TokenCache) GetToken(ctx context.Context) (*OAuthToken, error) {
	tc.mu.RLock()
	if tc.token != nil && time.Now().Before(tc.expiresAt.Add(-30*time.Second)) {
		tok := tc.token
		tc.mu.RUnlock()
		return tok, nil
	}
	tc.mu.RUnlock()

	tc.mu.Lock()
	defer tc.mu.Unlock()

	if tc.token != nil && time.Now().Before(tc.expiresAt.Add(-30*time.Second)) {
		return tc.token, nil
	}

	return tc.fetchToken(ctx)
}

func (tc *TokenCache) fetchToken(ctx context.Context) (*OAuthToken, error) {
	data := url.Values{
		"grant_type":    {"client_credentials"},
		"client_id":     {tc.clientID},
		"client_secret": {tc.clientSecret},
		"scope":         {tc.scopes},
	}

	req, err := http.NewRequestWithContext(ctx, http.MethodPost, cxoneOAuthEndpoint, strings.NewReader(data.Encode()))
	if err != nil {
		return nil, fmt.Errorf("oauth request creation failed: %w", err)
	}
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

	client := &http.Client{Timeout: 10 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		return nil, fmt.Errorf("oauth request failed: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		body, _ := io.ReadAll(resp.Body)
		return nil, fmt.Errorf("oauth token error %d: %s", resp.StatusCode, string(body))
	}

	var token OAuthToken
	if err := json.NewDecoder(resp.Body).Decode(&token); err != nil {
		return nil, fmt.Errorf("oauth decode failed: %w", err)
	}

	tc.token = &token
	tc.expiresAt = time.Now().Add(time.Duration(token.ExpiresIn) * time.Second)
	return tc.token, nil
}

Implementation

Step 1: Construct Highlight Payloads and Validate Against NLP Constraints

The Agent Assist highlight schema requires strict index bounds, span limits, and non-overlapping references. The NLP engine rejects spans exceeding 150 characters or indices outside the transcript window.

type MentionReference struct {
	Term          string `json:"term"`
	StartPosition int    `json:"start_position"`
	EndPosition   int    `json:"end_position"`
	Confidence    float64 `json:"confidence"`
}

type KeywordMatrix struct {
	Category string           `json:"category"`
	Terms    []string         `json:"terms"`
	Synonyms map[string][]string `json:"synonyms,omitempty"`
}

type MarkDirective struct {
	Action      string `json:"action"`
	Priority    int    `json:"priority"`
	DisplayType string `json:"display_type"`
}

type HighlightPayload struct {
	SessionID        string             `json:"session_id"`
	HighlightID      string             `json:"highlight_id"`
	MentionRef       MentionReference   `json:"mention_ref"`
	KeywordMatrix    KeywordMatrix      `json:"keyword_matrix"`
	MarkDirective    MarkDirective      `json:"mark_directive"`
	TranscriptLength int                `json:"transcript_length"`
}

func generateID() (string, error) {
	n, err := rand.Int(rand.Reader, big.NewInt(999999999))
	if err != nil {
		return "", err
	}
	return fmt.Sprintf("hl_%d", n.Int64()), nil
}

func ValidateHighlightPayload(p HighlightPayload) error {
	span := p.MentionRef.EndPosition - p.MentionRef.StartPosition
	if span <= 0 || span > 150 {
		return fmt.Errorf("nlp constraint violation: highlight span %d exceeds maximum 150 characters", span)
	}
	if p.MentionRef.StartPosition < 0 || p.MentionRef.EndPosition > p.TranscriptLength {
		return fmt.Errorf("nlp constraint violation: indices out of transcript bounds [%d, %d]", p.MentionRef.StartPosition, p.MentionRef.EndPosition)
	}
	if p.MentionRef.Confidence < 0.75 {
		return fmt.Errorf("nlp constraint violation: confidence %f below minimum threshold 0.75", p.MentionRef.Confidence)
	}
	if p.MarkDirective.Priority < 1 || p.MarkDirective.Priority > 5 {
		return fmt.Errorf("mark directive constraint violation: priority must be between 1 and 5")
	}
	return nil
}

Step 2: Atomic PUT Operations with Format Verification and Context Window Triggers

Atomic updates prevent race conditions when multiple mention detectors fire simultaneously. The context window trigger ensures highlights only apply when the agent view is active.

type HTTPClient struct {
	baseURL   string
	cache     *TokenCache
	retryBase time.Duration
	maxRetries int
}

func NewHTTPClient(cache *TokenCache) *HTTPClient {
	return &HTTPClient{
		baseURL:    cxoneAPIBase,
		cache:      cache,
		retryBase:  time.Second,
		maxRetries: 3,
	}
}

func (c *HTTPClient) ApplyHighlight(ctx context.Context, payload HighlightPayload) (*http.Response, error) {
	if err := ValidateHighlightPayload(payload); err != nil {
		return nil, fmt.Errorf("validation failed before put: %w", err)
	}

	token, err := c.cache.GetToken(ctx)
	if err != nil {
		return nil, fmt.Errorf("token retrieval failed: %w", err)
	}

	endpoint := fmt.Sprintf("%s/agentassist/sessions/%s/highlights/%s", c.baseURL, payload.SessionID, payload.HighlightID)
	jsonBody, err := json.Marshal(payload)
	if err != nil {
		return nil, fmt.Errorf("json marshal failed: %w", err)
	}

	return c.doAtomicPUT(ctx, endpoint, jsonBody, token)
}

func (c *HTTPClient) doAtomicPUT(ctx context.Context, endpoint string, body []byte, token *OAuthToken) (*http.Response, error) {
	var resp *http.Response
	var lastErr error

	for attempt := 0; attempt <= c.maxRetries; attempt++ {
		req, err := http.NewRequestWithContext(ctx, http.MethodPut, endpoint, bytes.NewReader(body))
		if err != nil {
			return nil, err
		}
		req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token.AccessToken))
		req.Header.Set("Content-Type", "application/json")
		req.Header.Set("Accept", "application/json")
		req.Header.Set("X-Format-Verification", "strict")

		client := &http.Client{Timeout: 15 * time.Second}
		resp, err = client.Do(req)
		if err != nil {
			lastErr = err
			continue
		}

		if resp.StatusCode == http.StatusTooManyRequests {
			backoff := c.retryBase << uint(attempt)
			time.Sleep(backoff)
			continue
		}

		if resp.StatusCode == http.StatusOK || resp.StatusCode == http.StatusCreated {
			return resp, nil
		}

		bodyBytes, _ := io.ReadAll(resp.Body)
		lastErr = fmt.Errorf("api error %d: %s", resp.StatusCode, string(bodyBytes))
		if resp.StatusCode >= 500 {
			time.Sleep(c.retryBase << uint(attempt))
			continue
		}
		return resp, lastErr
	}

	return nil, fmt.Errorf("max retries exceeded: %w", lastErr)
}

Step 3: Sentiment Polarity Checking and False Positive Suppression Pipeline

The validation pipeline filters out neutral mentions and suppresses false positives before API submission. This prevents UI noise during high-volume scaling.

type SentimentResult struct {
	Polarity    float64 `json:"polarity"`
	Label       string  `json:"label"`
	Suppressed  bool    `json:"suppressed"`
	SuppressReason string `json:"suppress_reason,omitempty"`
}

func EvaluateSentimentAndSuppress(mention string, confidence float64, transcriptContext string) SentimentResult {
	// Simulated NLP sentiment analysis based on keyword presence and confidence
	scores := map[string]float64{
		"competitor_a": 0.85,
		"competitor_b": 0.78,
		"rival_service": 0.92,
	}

	score, exists := scores[mention]
	if !exists {
		return SentimentResult{Label: "unknown", Suppressed: true, SuppressReason: "unrecognized competitor term"}
	}

	if confidence < 0.80 {
		return SentimentResult{Label: "low_confidence", Suppressed: true, SuppressReason: "confidence below suppression threshold"}
	}

	if score < 0.5 {
		return SentimentResult{Label: "neutral", Suppressed: true, SuppressReason: "neutral polarity filtered"}
	}

	return SentimentResult{Polarity: score, Label: "actionable", Suppressed: false}
}

func BuildAndValidateHighlight(sessionID, mentionTerm string, start, end, transcriptLen int, confidence float64) (*HighlightPayload, error) {
	sentiment := EvaluateSentimentAndSuppress(mentionTerm, confidence, "")
	if sentiment.Suppressed {
		return nil, fmt.Errorf("suppression pipeline blocked highlight: %s", sentiment.SuppressReason)
	}

	id, err := generateID()
	if err != nil {
		return nil, err
	}

	return &HighlightPayload{
		SessionID:      sessionID,
		HighlightID:    id,
		MentionRef: MentionReference{
			Term:          mentionTerm,
			StartPosition: start,
			EndPosition:   end,
			Confidence:    confidence,
		},
		KeywordMatrix: KeywordMatrix{
			Category: "competitor_intelligence",
			Terms:    []string{mentionTerm},
		},
		MarkDirective: MarkDirective{
			Action:      "highlight",
			Priority:    3,
			DisplayType: "inline_banner",
		},
		TranscriptLength: transcriptLen,
	}, nil
}

Step 4: Webhook Synchronization, Latency Tracking, and Audit Logging

External dashboard alignment requires webhook registration. Latency and success rates feed efficiency metrics. Audit logs satisfy quality governance requirements.

type AuditLog struct {
	Timestamp    time.Time `json:"timestamp"`
	SessionID    string    `json:"session_id"`
	HighlightID  string    `json:"highlight_id"`
	Term         string    `json:"term"`
	Action       string    `json:"action"`
	Status       string    `json:"status"`
	LatencyMs    int64     `json:"latency_ms"`
	Suppressed   bool      `json:"suppressed"`
	Error        string    `json:"error,omitempty"`
}

type HighlightMetrics struct {
	mu           sync.Mutex
	TotalMarks   int
	Successful   int
	TotalLatency time.Duration
}

func (m *HighlightMetrics) Record(success bool, latency time.Duration) {
	m.mu.Lock()
	defer m.mu.Unlock()
	m.TotalMarks++
	m.TotalLatency += latency
	if success {
		m.Successful++
	}
}

func (m *HighlightMetrics) GetSuccessRate() float64 {
	m.mu.Lock()
	defer m.mu.Unlock()
	if m.TotalMarks == 0 {
		return 0.0
	}
	return float64(m.Successful) / float64(m.TotalMarks)
}

func RegisterMentionWebhook(ctx context.Context, cache *TokenCache, callbackURL string) error {
	token, err := cache.GetToken(ctx)
	if err != nil {
		return err
	}

	webhookPayload := map[string]interface{}{
		"name":        "competitor_mention_sync",
		"event_names": []string{"agentassist.highlight.created", "agentassist.highlight.updated"},
		"callback_url": callbackURL,
		"headers": map[string]string{
			"Content-Type": "application/json",
			"X-Source":     "cxone-mention-highlighter",
		},
		"enabled": true,
	}

	jsonBody, _ := json.Marshal(webhookPayload)
	req, _ := http.NewRequestWithContext(ctx, http.MethodPost, cxoneAPIBase+"/webhooks", bytes.NewReader(jsonBody))
	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token.AccessToken))
	req.Header.Set("Content-Type", "application/json")

	client := &http.Client{Timeout: 10 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		return err
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusCreated && resp.StatusCode != http.StatusOK {
		body, _ := io.ReadAll(resp.Body)
		return fmt.Errorf("webhook registration failed %d: %s", resp.StatusCode, string(body))
	}
	return nil
}

Complete Working Example

package main

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"
	"net/url"
	"os"
	"strings"
	"time"
)

func main() {
	ctx := context.Background()

	// Load credentials from environment
	clientID := os.Getenv("CXONE_CLIENT_ID")
	clientSecret := os.Getenv("CXONE_CLIENT_SECRET")
	if clientID == "" || clientSecret == "" {
		log.Fatal("CXONE_CLIENT_ID and CXONE_CLIENT_SECRET must be set")
	}

	scopes := "AgentAssist:Read AgentAssist:Write Interaction:Read Webhook:Write"
	cache := NewTokenCache(clientID, clientSecret, scopes)
	client := NewHTTPClient(cache)
	metrics := &HighlightMetrics{}

	// Register webhook for external dashboard sync
	callbackURL := os.Getenv("WEBHOOK_CALLBACK_URL")
	if callbackURL != "" {
		if err := RegisterMentionWebhook(ctx, cache, callbackURL); err != nil {
			log.Printf("Warning: webhook registration failed: %v", err)
		}
	}

	// Simulate mention detection pipeline
	mentions := []struct {
		SessionID string
		Term      string
		Start     int
		End       int
		TransLen  int
		Conf      float64
	}{
		{"sess_001", "competitor_a", 45, 57, 500, 0.92},
		{"sess_002", "rival_service", 112, 125, 800, 0.65},
		{"sess_003", "competitor_b", 200, 212, 1000, 0.88},
	}

	for _, m := range mentions {
		startTime := time.Now()
		payload, err := BuildAndValidateHighlight(m.SessionID, m.Term, m.Start, m.End, m.TransLen, m.Conf)
		if err != nil {
			log.Printf("Pipeline blocked %s: %v", m.Term, err)
			metrics.Record(false, time.Since(startTime))
			writeAuditLog(AuditLog{
				Timestamp:  time.Now(),
				SessionID:  m.SessionID,
				Term:       m.Term,
				Action:     "suppression",
				Status:     "blocked",
				LatencyMs:  time.Since(startTime).Milliseconds(),
				Suppressed: true,
				Error:      err.Error(),
			})
			continue
		}

		resp, err := client.ApplyHighlight(ctx, *payload)
		latency := time.Since(startTime)
		success := err == nil && resp != nil && (resp.StatusCode == http.StatusOK || resp.StatusCode == http.StatusCreated)
		metrics.Record(success, latency)

		if success {
			log.Printf("Highlight applied: session=%s term=%s latency=%v", payload.SessionID, payload.MentionRef.Term, latency)
		} else {
			log.Printf("Highlight failed: session=%s term=%s error=%v latency=%v", payload.SessionID, payload.MentionRef.Term, err, latency)
		}

		writeAuditLog(AuditLog{
			Timestamp:  time.Now(),
			SessionID:  payload.SessionID,
			HighlightID: payload.HighlightID,
			Term:       payload.MentionRef.Term,
			Action:     "put_highlight",
			Status:     "success",
			LatencyMs:  latency.Milliseconds(),
		})
	}

	log.Printf("Final metrics: success_rate=%.2f%% total_marks=%d avg_latency=%v", 
		metrics.GetSuccessRate()*100, metrics.TotalMarks, metrics.TotalLatency/time.Duration(metrics.TotalMarks))
}

func writeAuditLog(logEntry AuditLog) {
	jsonData, err := json.MarshalIndent(logEntry, "", "  ")
	if err != nil {
		log.Printf("Audit log marshal failed: %v", err)
		return
	}
	fmt.Println(string(jsonData))
}

Common Errors & Debugging

Error: 401 Unauthorized

• Cause: Expired OAuth token or missing Authorization header.
• Fix: Verify token cache refresh logic. The implementation includes a 30-second safety margin before expiration. Ensure the client credentials match the registered CXone application.

Error: 403 Forbidden

• Cause: Missing required OAuth scopes.
• Fix: Request AgentAssist:Write and AgentAssist:Read scopes during token exchange. The token cache explicitly scopes the request. Update the CXone OAuth client configuration if scopes are restricted.

Error: 429 Too Many Requests

• Cause: Rate limit exceeded during concurrent highlight submissions.
• Fix: The doAtomicPUT function implements exponential backoff with a base of 1 second. Adjust retryBase and maxRetries in production based on CXone tenant limits. Implement request queuing if volume exceeds 100 requests per minute.

Error: 400 Bad Request (NLP Constraint Violation)

• Cause: Highlight span exceeds 150 characters, indices fall outside transcript bounds, or confidence falls below 0.75.
• Fix: Review ValidateHighlightPayload. Ensure transcript length matches the actual interaction payload. Adjust start/end indices to align with character offsets, not word indices.

Error: 5xx Server Error

• Cause: CXone platform transient failure.
• Fix: The retry loop handles 5xx responses with backoff. If persistent, verify CXone status dashboard. Implement circuit breaker patterns in production to prevent cascading failures.

Official References

• NICE CXone Agent Assist API Documentation
• NICE CXone OAuth2 Authentication Guide
• NICE CXone Webhooks Configuration
• Go HTTP Client Best Practices