Function getConversationTokenLimit

server/src/utils/token-limiter.ts:92–109

(model?: string, toolCount?: number)

 * @returns Maximum tokens available for conversation history
 */
export function getConversationTokenLimit(model?: string, toolCount?: number): number {
  const limit = MODEL_CONTEXT_LIMITS[model ?? 'default'] ?? MODEL_CONTEXT_LIMITS.default;

  // If tool count is provided, use dynamic calculation
  if (toolCount !== undefined) {
    const toolTokens = estimateToolTokens(toolCount);
    const reserved =
      TOKEN_BUFFERS.systemPrompt +
      toolTokens +
      TOKEN_BUFFERS.prependedContext +
      TOKEN_BUFFERS.responseBuffer +
      TOKEN_BUFFERS.safetyMargin;
    return limit - reserved;
  }

  // Fall back to default static buffer
  return limit - RESERVED_TOKENS;
}

/**
 * Estimate token count from text using a character-based heuristic.