Anthropic Data Handling

Overview

Handle data responsibly when building with Claude — manage the 200K token context window efficiently, implement conversation trimming strategies, redact PII before sending to the API, and configure data retention settings.

Context Window Management

Claude models have a 200K token context window. Managing it efficiently is critical.

// Count tokens before sending
const count = await client.messages.countTokens({
  model: 'claude-sonnet-4-20250514',
  messages,
  system: systemPrompt,
});