clade-data-handling

name	clade-data-handling
description	Handle sensitive data with Claude — PII redaction, conversation management, Use when working with data-handling patterns. context window optimization, and data retention policies. Trigger with "anthropic data privacy", "claude pii", "anthropic context window", "manage claude conversations", "anthropic data retention".
allowed-tools	Read, Write, Edit
version	1.0.0
license	MIT
author	Jeremy Longshore <[e-mail]>
compatible-with	claude-code
tags	["saas","anthropic","claude","data","privacy","context"]

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,
});

// Budget: 200K total - max_tokens (output) = available input
const MAX_CONTEXT = 200_000;
const MAX_OUTPUT = 4096;
const inputBudget = MAX_CONTEXT - MAX_OUTPUT;

if (count.input_tokens > inputBudget) {
  // Trim oldest messages, keep system prompt + recent context
  messages = trimToFit(messages, inputBudget);
}

Instructions

Step 1: Conversation Trimming

function trimConversation(messages: MessageParam[], maxTokens: number): MessageParam[] {
  // Always keep the first message (often contains key context)
  // Keep the most recent messages
  // Drop middle turns first
  if (messages.length <= 4) return messages;

   first = messages[];
   recent = messages.(-); 
   [first, ...recent];
}